I have always been a big motorhead and experimented with nitrous, alcohol injection, nitromethane, propane, racing gas and more. But I'm not familiar with a boost bottle what's inside of it? Compressed air, nitrous or something else? I might want to put it on my motorized bike.
I have a 175cc Yamaha with a boost bottle I installed in the mid 80's. The original purpose of a boost bottle was to give you a little boost. When racing you approach a turn with throttle closed. When exiting the turn you open the throttle. The vacuum in the crank and ports draw in the fuel mixture. At closed throttle a vacuum is created. A two cycle engine is not that quick revving at a low rpm so the boost bottle acts as a source of vacuum greater than the low revving crank could supply. This would allow a little more fuel in a little quicker. As soon as opening the throttle the effect was gone. Most folks do not race that way anymore and the 66cc engines do not have the torque to utilize quick exits from the turns. I never could tell any improvements from installing the boost bottle. Safe riding out there
@@larryyounger8674 I've got to put my 66 tooth rear sprocket on it should make a difference over the stock 50. I want all bottom end and hill power torque.
Hey how do you get your bikes to idle? Do you have the clutch engaged or is it able to just sit there without taking off? Dumb question ik but my builds never want to sit and idle they all just want to move about 5-7mph when I let out the clutch
My dad is a retired mechanic who worked on and competitively rode motor bikes his entire life. I asked him what boost bottles do and his response was: "Help guys who don't know any better feel like they're doing something."
I watched this one dudes clip and all it was empty PVC pipe and he hooked it up to the intake and from what he was saying all it does is act like an expansion chamber no clue but hey ya never kn till u try it.but his was much bigger and said it has to be ard the same size of cb radio inside engine
Very interesting video. I heard first about boost bottles two years ago. I drive a 250ccm 2-stroke MZ ETZ 251 built in East Germany and some people claimed that it runs smoother with such a device. Big 2-stroke engines do not run so well in idle (no stable rpm) and there is a problem when you run downhill. When you turn down the throttle the engine starts what we call in German "push jerking". I read that boost bootles will reduce both problems (no claim for more power or less fuel consumption). I installed a 200ccm bootled with a 12mm pipe between the carburetor and the motor. I was amazed how smooth it runs now in idle and going downhill reduces the jerking quite a bit. Probably a bigger bottle will be even better. I can confirm, that I have noticed no increase in power and also not less fuel consumption. So no need for it on small motors.
I can say: the "push jerking" is almost gone after i installed the boost bottle. And the Engine runs more fuel efficient mainly in Idle. The diameter and lenght of the hose are very important too.
I think they work in very special cases and they have to be "tuned" per engine, its not just a bolt on power adder. they require planning and tinkering to get any gains or its a "fix" for an intake that has volume issues.
I built 1 and used the original 40mm intake like you tried,and drilled the same spot.I used the plan of matching cylinder volume with the bottle's.It cut the back-spit through the carb,but I saw no benefit.I replaced the intake with a CDHPower Reed valve and Did gain all kinds of torque.Happy Trails everyone,and Merry Christmas.
Thank you!!! Finally!!! Your video proved my theory that the boost bottle won't work well on a stock engine with stock parts. I've gone up and down for videos for 2 months describing it how it works but nothing!! Your vid save me alot of time and money. Your the man!!! Ill make sure this goes viral.
The problem i see with this test is the intake tube is different then what you had on the bike. some years ago I took my intake tube and added a boost bottle to it. i made my own bottle out of pvc pipe and messed with the size of the bottle. I ended up with a much bigger bottle then what you get if you buy one online and it worked great. it effected the low end and high end alittle but had a very noticable effect on how smooth the engine ran. I then changed out to a reed valve and it was much better.
The “boost bottle” supposedly affects the *resonant frequency* of the intake port. I recall reading about these things in magazines back in the early eighties. About all I can recall is the term “Helmholtz Resonator” from what I read forty or so years ago.
Addendum to above: the resonator has its own frequency, and the tube acts to attenuate/broaden that resonant peak. The chief thing is that the resonance of the bottle needs to coincide with the resonance of the intake tract itself. The way this supposedly works is that when the intake port closes, the pressure wave in the intake tract that goes with closing goes up into the bottle, which is supposed to return another pressure wave right when the intake port opens. This only happens in a fairly narrow range of RPM, and harmonics of the resonant frequency that correspond to higher rev ranges. Its chief “use” back in the day was to deal with then-unexplained “dips” in the torque curve. It took a *lot* of time to get it right, and needed retuning every time the engine was changed in some trivial-seeming way, e.g. when mechanic so-and-so worked on *Bob’s* bike to give it a smidge more to end… To get the “best” results - whatever those might well be - the tube needs to be of fairly large bore, and the correct length; the reservoir needs to be as close to a sphere as possible, and of the correct volume; and the connection to the intake port needs to be as close to the descending piston in the intake port as can readily be achieved. If a reed valve is used, then it needs to be on the carb side of the reed block, and as close to the back sides of the reed cage as can be managed.
I knew they were junk. I've never seen. 1 before these engines. Never needed 1 buildin chopper's, dirt bikes, nor anythin really. & I've been buildin & repairin bikes a long time. I'm 52 yrs. young.
I would check other sources and different products before making that decision. His set up is extremely restricted. Boost bottles aren't supposed to be clogging up 1/3 of the intake. So something a little better planned out than that.
Definitely can relate to that video not being any real proof of a boost bottle working I love how you go in depth and tell us and show us all the do's and don'ts for these engines or just your opinion thank you.
I've been around hocus pocus products... this one takes the cake LOL. Huge companies like yamaha tried making it work a long time ago, and they found that these resonant bottles won't do much at all and for the production to be viable it has to make some margin of increase. Instead... they found it to be a fool's gold. Thanks for making this video. It could help a lot of people save up their money to make actual change in their machines instead of buying this hocus pocus product.
Honda puts the accumulator (boost bottle) connection between the carb and the airbox for a 2008-2009 CRF230L. I have tried my CRF230L with and without the accumulator connected and there is a definite difference....but again the connection is between the carb and the air cleaner NOT between the carb and the cylinder. Plus the CRF230L is a 4 stroke.
I tried the same kit on my one piece cylinder engine and yes a tuning nightmare began.i did get it tuned and ran it for about 100 miles now.the only noticeable gain I have is I gained about 10-15 miles per tank of fuel..no real loss or gain in torque or top speed.i have chose to keep it on one of my bikes for the extra mikes per tank although there is alternatives to get more miles per your ride I have already paid for it so might as well use it lol good video as always 👍
Great video. I know a little about the bike motor and how it pulls the fuel from the carburetor into the sump of the motor when the piston goes up, the crank shaft then get compressed by the downward movement of the piston. As the piston travels up again it release the pressure up and into the cylinder for the compression stroke before the spark turns the gasses into the power stroke. So you have constant pressure then vacuum faster than a fly flaps it wings for lift. In doing so, the gasses can vomit back out the intake as well as suck back from the exhaust. Hence having a tuned exhaust gives just the right amount of back flow restriction, in turn the flow of vapers stops fluxing as violently, So the boost bottle is thought to take up some of the fluxing or vomiting back fuel as well. I believe for a boost bottle to work. You need a diaphragm inside the bottle to throw the vomit of fuel back. Aaa the missing link to the boost bottle. Try this if you can find one. a soft rubber ball you can crush flat in your fingers, It must fit the boost bottle. This might give the bounce back the bottle needs. Good luck.
@@supersportryder I said"pulls the fuel from the carburetor into the sump of the motor, when the piston goes up. How did you get confused? Remember the two side ports and front ports make the pressure build because of the crank pressure. This is why, "When a crank seal goes out. A motor can not pull a vacuum." if you have no vacuum, then no suction across the jets in the carburetor. As for the boost bottle. It is missing a key part. How you going to get a racket from a rubber ball?
Thank god there is someone else who lives in reality...just 1 of the reasons I subscribe to this awesome channel. Boost bottles only boost egos not performance...I wanna see NOS and CO2 inflators.
Hahahaha. First thank for your genuine videos. Your not out to promote or trash talk....just what an honest opinion for your experiences. I am a first time buyer of the 66cc/80cc Amazon China 2 stroke. I've been tinkering for just over a week....tore the motor right down the day it arrived (I took small engine repair in junior high school so I know how most factories pump engines out). For whatever reason this boost bottle article or perhaps an ad non the less I got sucked in(anything I can do for just a little bit more efficiency and ummmph). I sure wish I had see this video sooner. Dang. No matter how I work it I do need the offset intake. I noted how you tested for leaks on the welds. Thank you. I had another method in mind and yours is next to zero extra dollars and effective. I'm in the process now of mounting a Bluetooth boombox I diy'd into the frame as well as wiring in (totally separate from the bike's electrical)an Amazon headlight and rear signals w/tail light to a set of actual Street bike handlebar controls. I noticed you have a video on electrical. Just going that way now. Again thank you for your time and efforts to get information out to inquiring minds. From a covid free Canuck Cheers.
Thanks man! I have also been thinking about using some of those water proof Bluetooth speakers to make a bike radio for a fun video, as well as an alarm system :P ... Good luck on your build!
Thanks for saving me the time and money. I agree that it should be able to convince me without having to find some minut mileage or acceleration gain. I think you got it right and it helped a few mistuned motors but if it was what we wanted it to be their would be vids of people drastically improving their acceleration and the crashes likely to occur if they had a bolt on nos kit for a 49 cc 2 stroke. For now only highly competent people are the only ones making insane lawnmower motor bikes but soon enough someone will make a conversion kit to run jet fuel or something nuts and the fun will begin.
Nobody's ever accused Bikeberry of being honest about all the products they sell. They sent me a bum $100 4 store transmission. And then refuse to make it right after sending them numerous pictures upon their request. I hear a lot of people talk trash about gas bikes, but they always been straight with me. Bikeberry not the case.
I put the boost bottle and high performance carb on. My low end was terrible so I popped the end off my stock muffler and now I'm happy. You need lots of air flow, at least at my altitude of 5,000 feet.
Nice video but I had that same intake without the hole in it for the line and that seriously hurt my bikes throttle response and it would usually bog out and die. I found that out the hard way lol back when I didn’t know enough about how 2 strokes worked and air doesn’t like going through corners!! Keep up the vids
I agreed, the offset intake is junk. I can retest with a cnc intake, but at that point it would only be to push the topic further for "boost bottle fan boys"...
That thing that gets me thinking is, how do we even know that they fill those bottles with nitrous oxide from the factory? I noticed in your video that the "boost fuel" flowing through the clear tube was a liquid. Nitrous oxide by nature is actually a gas. The only time it is in liquid form is when it is mixed with gasoline, called a wet trigger system, which you didn't have on this setup. I greatly appreciate this video! You have definitely changed my mind. I almost bought a boost kit for $100!!!!! Thank you so much!
Originally boost bottles were empty chambers that used resonation. It's beyond my knowledge, but they have to be designed and tuned for the motor. This one is not.
@@LAHover I see. That makes sense. I didn't even know these were on the market. Now I know what not to do buy though! Thanks again! After I looked at the listing I found again, I did actually mention that it used true NOS. They come in cartridges that look like Co2 cartridges found in BB guns.
I know it's been a while, but I just built my first bike a few days ago, so I'm watching everything I can. Anyway, I JUST saw that "squeezed the tube" video like 10 min ago. Might be my first motorized bicycle build, but far from my first motor, and I KNOW that the positive effects of an intake booster - on a motor this small - would be so negligible that you would need technical equipment (and very precise tuning) to find it. At most - slightly improved MPG and barely cleaner emitions - NO performance gain. I seem to get the most useful, or worthwhile, tweaks from your videos. If I find a good idea somewhere else, it's usually something I've already heard from you. Thanks for all the work and good info.
I like your last name........I sure wouldn't buy a boost bottle but would try a free DIY one. I just watched the Thunderhead video, he said it #1 used less fuel to idle/ Increased MPGs #2 gave him a couple mph extra top speed. I think on the right setup with the right intake,(not have the hose fitting down inside blocking the intake airflow) it could help but just switching to a reed would most likely be a better overall improvement. They probably did work on old dirt bikes since they were tested by engineers & came stock on bikes. They were probably discontinued due to a better design engine/carb/intake,etc...
You do a great job really think it through on your tests and videos. I just came across you and after watching this video I smashed that like and bell. Keep up the good work
Think water hammer. Most water pipes in code have hammer arresters. Those have pipes reaching them the same size as the pipe. You'd need an actual tee. Just making your intake longer would do the same thing. If those work, then your intake needs rework. Just use a reed valve. Same thing. Keeps it in the crankcase.
6:00 it doesn’t prove it works or doesn’t, it’s to show how to make a poor man’s kill switch😂😂 Love your videos❤️❤️ and I’m thinking about making a “short” video on a boost bottle as well since I’ve never tried one before! Thank you for the knowledge!!
Ok so it actually takes 4 boost bottles. First convert motor to run on alcohol. Fill the tank with alcohol. Then fill all 4 boost bottles with alcohol run tubes inside the bottles to the bottom, use t fittings to connect all 4 bottles together. Use one last tube to run to the operator. Now both the bike and the rider get a boost :)
Never heard of a boost bottle until I got into motorized bikes, I was a dirt bike and 2stroke Kart racer and never saw anything in my time, now that was back in the early eighties to mid nineties
Great video, very much appreciated! Hope you read this and help me understand something. I built my first bike, lots of fun and all that. Have a 44 tooth sprocket and an HP carb...but can only get to 22 p Mph best speed. HP carb only has 1 screw for idle( I'm assuming) so should I focus on a larger carb jet? Appreciate any advice, thank you!
Thanks. The carb could be affecting performance, but there are many other things on a build that can effect it as well. An NT Speed carb will easily get my 210lb butt up to 45 MPH. So I imagine the HP carb could do about the same with the right jet...
Model airplane engines and 2 cycle motorcycles use similar principals in their design the difference is that crankcase volume and shape produces the pumping effect to move fuel/air into the cylinder. I think boost bottles went away because engine designers got better at the volumetric flow design. The only thing i have ever see a boost bottle is improve idle and they are far larger than a co2 cartridge. . The boost bottle set up on these bike engines won't work for a specific reason. In order for a boost bottle to work the intake and exhaust gas pulse have to be matched. The exhaust volume is far larger than the intake. Look at a tuned pipe exhaust. Have you ever wondered why it is so big. That is why tuned pipes are used on higher performance engines. 2 cycle engines have to have back pressure to have a good power band. The exhaust pulse heads back to the exhaust port as well as leaving the pipe.That return flow holds more of the incoming intake charge of air/fuel in the cylinder. That is called scavenging. Now if you attach a hose to an intake you have a vacuum source. That bottle becomes a vacuum tank. I saw in the video the guy pinch the line and it dies. I think there is a vacuum leak and a very rich mixture. If you cut down air flow by pinching the line you just choked the engine.That is why it died. By adding that line you just made the intake volume bigger, now that will give you a lean mix unless you richen the carb mixture. That part is closed off but not the rest of the intake But it is dead space. You now have the volumetric equivalent of a hotdog in a hallway. I think everybody needs to stop hyper focusing on the boost part of the power process. This is a cheap Chinese engine Not a Celica GT engine! The best gains to be had is by cleaning up the ports and making sure the intake pipe has a good seal, look to see if the pipe is aligned with the intake port . My engine was off by intake pipe was mounted 1/8 of a inch So i got lousy airflow and a perpetual lean condition. The factory pipe is pretty good but if you want it better get a tuned pipe exhaust. Put a nkg spark plug on it and Get a real ignition wire and install it on the coil.It will run much better. My dad had a old mechanic that worked on his cars used to say keep it simple cause if you are fixing it all the time it is as worthless as a turd in a bucket of hammers. He is right. Make it dependable and you will have more fun. These are my thoughts on this subject.
The video you were talking about is thunder head 289, he is a smart guy but if you watch his videos on the motorized bicycle kit you can tell he doesn’t really know much about two strokes he is good at working on old cars though lol
Video definitely helped me out,thanks man. I wasn't sure about the things,but everything you said makes total sense. I won't be getting one of these. No matter how cool and shiny they look lol
Nice video. Malossi makes one of those ,that might have a reason. Because they add a spring inside,to compensate. Don't know how much it counts,but .. :)
You hit it on tthe head. Gimmicky is all. The Yamaha bottle disappeared for a reason, it didn't do what it was designed to do in the useable powerband.
Great video thanks so much for making it! My new build is holding up pretty good. I built it based off your yd100! I got a road master granite peak like yours, got VERY lucky on a motorized bike kit. Got everything on and today drove through the snow! Very fun build! After watching your videos, you encouraged me to build one. Best decision I’ve ever made! Thank you so much!!!
Whenever you have a tight spot where an Allen wrench won't fit because it's too long, you get your grinder or Dremel with a cut-off disc and trim the short end of the Allen so it can fit the nut in that tight spot. Make sense ?
Looking for some ideas to boost performance on my China doll as I live in the mountain range and need uphill performance. Guess I'll be skipping on the bottle
Will you be making a video of the new exhaust muffler and that I think it's a new sprocket adapter looks different would that be for this Friday coming up?
Hey, I Hand made my own Boost Bottle. It's NOT that difficult. I hand make ALL my gaskets. I "Lock Tight" every thing. This is my 5th summer. This is such fun HOBBY. I'm a small engine nut. I found the same stuff concerning boost bottle. Going with High compression head, Tuned pipe, and Jets, is, for me, is the way to improve engine running.
The only analogy application of anything I know that anywhere close to a boost bottle is on a vortex Chevy. The intake tube has a bulb designed into it, but if you look at the opening to that void to the intake is as big as the tube itself. So a hose isn't going to transfer or balance any pulse happening in that area. Even Chevy guys toss that and K&N it, which doesn't have a boost chamber void thingy. Snake Oil 😆
1st off did you start the 20ml test with an empty carburetor? As the 2nd half of the test the carb was empty and you put in 20 ml that 20 ml had to fill the bowl and line that was full on the first part? Do you understand me? Boost booths work by smooth out the pulse on a piston port. Thus leaning out the mixture. Did you notice less fuel puddling in the air filter? I did. I went from a 55 jet in my sha to a 62. But it got better mpg.
Great video I was on the fence about it just because for my latest build I realized I will need the offset intake. Obviously snake oil, wouldn't want to lose power to gain 1 mph
Im installing a case reed on a new yd 100 at the moment. CHD power carbon fiber petals with polished outer case. PWK 21mm carberator with a ZM 65 expansion chamber p y. Straight shot to the crankshaft and right up to the tranfers. Standard cylinder built for low end power but can breath too. I trued my crankshaft by hand and hammer. Almost perfect balance. I use a dial indicator on the bearing race of the crank then spun it and set it.
You are creating an unnecessarily strong turbulent flow in the intake manifold with that which definitively affects the combustion enough to lose a mph. The problem is clear when you know about how important it is for the vaporized mixture to enter and exit the chamber without facing any obstacles in the way.
I thought maybe the boos bottle intake thing might catch the carb back spray at high revs but yah that other guys video didn’t explain anything except how to shut off your bike with it
Boost bottles are garbage. Thanks for the video, well done. I can't wait to see those goodies that you teased us with there at the end. New sprocket mount for rear wheel and a new intake piece. Hurry
I think some kits like the bt110 (in my experience run rich from factory and 4 stroke) so for those kits it would make the bike run leaner and it wont 4 stroke so people think it gave it more top end speed when really its just running rich
I have boost bottle on my bike when I installed it on my bike and did have a difference in my performance it actually increased my speed about 5mph faster and was able to attach it to the 40mm neck for my carb
If memory serves, with Yamaha the idea was to gain low-end torque, and on their Enduro bikes they kinda-sorta worked, but they were just unsprung weight on the Motocross bikes, as they didn't do anything. My cousin had an IT490 that had a bottle, and he removed it and capped the hole...
Oh yeah, you're probably gonna like that pipe. I have one on mine, and there's a noticeable difference in performance from the stock pipe, and haven't burned my leg yet either!
From what ive seen, boost bottles just help with back pressure on two strokes by creating a consistent vacuum. So it wont really do much past about half throttle. And i believe reed valves do the same thing, but alot better, making them pointless.
I ran a boost bottle stock NT carb and it ran fine rode the hell out of it. But way it works most 2 strokes on compression will spray out fuel and air mix out thru the air intake. Boost bottle catches the fuel and air mix and puts it in on the next cycle
the best results come from a combination of expansion chamber and boost bottle. not a stock motor. you cant really expect this test to valid in my opinion. do another one with expansion chamber and boost bottle. then i might believe your results.
I know almost nothing about this, but as a curious person that knows just a little about two-strokes willing to play devils advocate. if there is something to this, im almost certain that this is a strategy for more efficiently clearing and/or charging the cylinder that would require tuning of the intake hose length and/or exhaust. If you think about something like a pulsejet or even a hydraulic ram pump I could see how this could do something useful for a twostroke, and you wouldnt see it on a racing bike, because they are doing that same kind of harmonics tuning with custom intakes and exhausts, and they certainly are. whether or not its a bad system I dont know, the intent behind this is almost certainly something like taking the high pressure wave that builds up in front of the inlet when it closes and instead of letting it dissipate into the atmosphere, reflecting it back towards the inlet so that it arrives when the bike is looking for more air. even modern production minivans and econoboxes are engineered to try to recover these kinds of losses these days, the racing bikes are too. What isnt engineered to recover these losses, is $50 two strokes from a whitelabel factory in china that come in a kit with whatever muffler and intake/carb was available and cheap. Someone that knew what they were doing might be able to take that same kind of tuning knowledge and with less overhead than a totally custom intake/exhaust adjust the tube length on one of these bottles to make a dirt cheap two-stroke give a little more within some rpm range, by adjusting the length of some rubber tube. all that being said, if there is any merit to these things working, its never going to be a "bolt-on, go-fast, wash your hands" project, its going to come from an engine builder that does a bunch of voodoo math to give a ratio for the size of bottle, length of tube, displacement and desired rpm peak and ships it.. without that, the likelyhood of hurting engine performance should be about as high as helping it, if youre reflecting the lowest pressure part of the wave back to the engine when its looking for air, youre not helping.
When starting my bike I usually get it running and rev it a little so it doesn't die stop the bike and rev it until it will Red line without dying and that's how I know it's warmed up sufficiently
Oh god boost bottles for me have been a vacuum leak nightmare. I tried one and got a super rich fuel mixture, ran good at lower to mid rpm but it wouldn’t wind out :/. I tried different jetting as well with the stock carb. If the stock carbs had a fuel mixture screw. or if the bikes came with a more complex carburetor. I’m sure someone could get them to work better than us average joes. I found that a richer jet works good for high end with the boost bottle but it won’t idle well (fouls plug). Edit: I didn’t notice much fuel efficiency difference with my tests. Just a weird power band
oh this, yeah, its used for Nos injection kit (go kart) Amazon. Handlebar trigger to manifold and thats the boost. Toss the bottle and use the line for the Nos for quick boost. Bottle use needs to go to crankcase not in manifold. You might as well soak all your old carb filters in gas and stuff it inside boost bottle(BBR BOOST bottle has cap that unscrews on both ends with o-ring seal... beautiful CNC work btw..) anyway, and use fumes...of anything....fart into it...get a genuine temp boost....but if you do that put a valve on manifold...to nullify system if you cant collect another use for bottle: make a fuel reservoir including the old supercub petcock with a reserve(Fuel Gas Petcock Replacement for Honda CRF 250 450 X 250X 450X Petrol Valve #H64) Idk -_- heres a joke: WHAT KIND OF TEA IS HARD TO SWALLOW? REALITY TEA HEE HA HA :) Falco - Rock Me Amadeus
If you have run your own test (real test), let us know so we can check it out! :)
Claims prove nothing, testing prove something!
@Bryant Knox instablaster =)
I have always been a big motorhead and experimented with nitrous, alcohol injection, nitromethane, propane, racing gas and more. But I'm not familiar with a boost bottle what's inside of it? Compressed air, nitrous or something else? I might want to put it on my motorized bike.
I have a 175cc Yamaha with a boost bottle I installed in the mid 80's. The original purpose of a boost bottle was to give you a little boost. When racing you approach a turn with throttle closed. When exiting the turn you open the throttle. The vacuum in the crank and ports draw in the fuel mixture. At closed throttle a vacuum is created. A two cycle engine is not that quick revving at a low rpm so the boost bottle acts as a source of vacuum greater than the low revving crank could supply. This would allow a little more fuel in a little quicker. As soon as opening the throttle the effect was gone. Most folks do not race that way anymore and the 66cc engines do not have the torque to utilize quick exits from the turns. I never could tell any improvements from installing the boost bottle. Safe riding out there
@@larryyounger8674 I've got to put my 66 tooth rear sprocket on it should make a difference over the stock 50. I want all bottom end and hill power torque.
Hey how do you get your bikes to idle? Do you have the clutch engaged or is it able to just sit there without taking off? Dumb question ik but my builds never want to sit and idle they all just want to move about 5-7mph when I let out the clutch
My dad is a retired mechanic who worked on and competitively rode motor bikes his entire life. I asked him what boost bottles do and his response was: "Help guys who don't know any better feel like they're doing something."
Lol that sounds about right.
Riiiiiiight.
Yep your dad was right kid
I watched this one dudes clip and all it was empty PVC pipe and he hooked it up to the intake and from what he was saying all it does is act like an expansion chamber no clue but hey ya never kn till u try it.but his was much bigger and said it has to be ard the same size of cb radio inside engine
All the veteran 2-stroke guys swear up and down that they don't work, that's enough for me.
Right!?! They straight up work.
Finally a serious video on this instead of just ads and bs...
Very interesting video. I heard first about boost bottles two years ago. I drive a 250ccm 2-stroke MZ ETZ 251 built in East Germany and some people claimed that it runs smoother with such a device. Big 2-stroke engines do not run so well in idle (no stable rpm) and there is a problem when you run downhill. When you turn down the throttle the engine starts what we call in German "push jerking". I read that boost bootles will reduce both problems (no claim for more power or less fuel consumption). I installed a 200ccm bootled with a 12mm pipe between the carburetor and the motor. I was amazed how smooth it runs now in idle and going downhill reduces the jerking quite a bit. Probably a bigger bottle will be even better. I can confirm, that I have noticed no increase in power and also not less fuel consumption. So no need for it on small motors.
Thanks for the feedback :)
I can say: the "push jerking" is almost gone after i installed the boost bottle. And the Engine runs more fuel efficient mainly in Idle. The diameter and lenght of the hose are very important too.
Yes at idle I noticed if I pinch the boost bottle line the engine will shut off .
I think they work in very special cases and they have to be "tuned" per engine, its not just a bolt on power adder. they require planning and tinkering to get any gains or its a "fix" for an intake that has volume issues.
I built 1 and used the original 40mm intake like you tried,and drilled the same spot.I used the plan of matching cylinder volume with the bottle's.It cut the back-spit through the carb,but I saw no benefit.I replaced the intake with a CDHPower Reed valve and Did gain all kinds of torque.Happy Trails everyone,and Merry Christmas.
And did you only added de cdh reed valve and gained torque? Or did you mount windowed pistón too?
Thank you!!! Finally!!! Your video proved my theory that the boost bottle won't work well on a stock engine with stock parts. I've gone up and down for videos for 2 months describing it how it works but nothing!! Your vid save me alot of time and money. Your the man!!! Ill make sure this goes viral.
The problem i see with this test is the intake tube is different then what you had on the bike. some years ago I took my intake tube and added a boost bottle to it. i made my own bottle out of pvc pipe and messed with the size of the bottle. I ended up with a much bigger bottle then what you get if you buy one online and it worked great. it effected the low end and high end alittle but had a very noticable effect on how smooth the engine ran. I then changed out to a reed valve and it was much better.
Information on your boost bottle
The “boost bottle” supposedly affects the *resonant frequency* of the intake port.
I recall reading about these things in magazines back in the early eighties. About all I can recall is the term “Helmholtz Resonator” from what I read forty or so years ago.
Addendum to above: the resonator has its own frequency, and the tube acts to attenuate/broaden that resonant peak.
The chief thing is that the resonance of the bottle needs to coincide with the resonance of the intake tract itself.
The way this supposedly works is that when the intake port closes, the pressure wave in the intake tract that goes with closing goes up into the bottle, which is supposed to return another pressure wave right when the intake port opens.
This only happens in a fairly narrow range of RPM, and harmonics of the resonant frequency that correspond to higher rev ranges.
Its chief “use” back in the day was to deal with then-unexplained “dips” in the torque curve. It took a *lot* of time to get it right, and needed retuning every time the engine was changed in some trivial-seeming way, e.g. when mechanic so-and-so worked on *Bob’s* bike to give it a smidge more to end…
To get the “best” results - whatever those might well be - the tube needs to be of fairly large bore, and the correct length; the reservoir needs to be as close to a sphere as possible, and of the correct volume; and the connection to the intake port needs to be as close to the descending piston in the intake port as can readily be achieved.
If a reed valve is used, then it needs to be on the carb side of the reed block, and as close to the back sides of the reed cage as can be managed.
Very helpful
So in the end, you realized that properly tuning your engine is a much better solution than a boost bottle? huh.
Boost bottle and expansion chamber, also the size of it matters. Combining them is like the window piston and Reed cable.
It worked for me! With a seeutek pk80. gas mileage on mine improved greatly!
I knew they were junk. I've never seen. 1 before these engines. Never needed 1 buildin chopper's, dirt bikes, nor anythin really. & I've been buildin & repairin bikes a long time. I'm 52 yrs. young.
I would check other sources and different products before making that decision. His set up is extremely restricted. Boost bottles aren't supposed to be clogging up 1/3 of the intake. So something a little better planned out than that.
I rip my bike around like it’s a dirtbike 😂,
Same😂my neighbors hate me
GET A new exhaust for it, and it will be more quiet and sound better than the stock, just for an idea
Same why this dude pebble so much😂
Definitely can relate to that video not being any real proof of a boost bottle working I love how you go in depth and tell us and show us all the do's and don'ts for these engines or just your opinion thank you.
I've been around hocus pocus products... this one takes the cake LOL. Huge companies like yamaha tried making it work a long time ago, and they found that these resonant bottles won't do much at all and for the production to be viable it has to make some margin of increase. Instead... they found it to be a fool's gold. Thanks for making this video. It could help a lot of people save up their money to make actual change in their machines instead of buying this hocus pocus product.
I ran a boost bottle for a while and noticed a smoother ride and better mpg but also a loss in power
Loss in power would explain the better MPGs
My bike has had mark (over the top improvement!) In gas alone!
@@BrotherDon01 What??
Honda puts the accumulator (boost bottle) connection between the carb and the airbox for a 2008-2009 CRF230L. I have tried my CRF230L with and without the accumulator connected and there is a definite difference....but again the connection is between the carb and the air cleaner NOT between the carb and the cylinder. Plus the CRF230L is a 4 stroke.
I tried the same kit on my one piece cylinder engine and yes a tuning nightmare began.i did get it tuned and ran it for about 100 miles now.the only noticeable gain I have is I gained about 10-15 miles per tank of fuel..no real loss or gain in torque or top speed.i have chose to keep it on one of my bikes for the extra mikes per tank although there is alternatives to get more miles per your ride I have already paid for it so might as well use it lol good video as always 👍
See, I didn't think it would work too well if any.
However I feel like it needs a very specific set up to get anything out of the boost bottle
Great video. I know a little about the bike motor and how it pulls the fuel from the carburetor into the sump of the motor when the piston goes up, the crank shaft then get compressed by the downward movement of the piston. As the piston travels up again it release the pressure up and into the cylinder for the compression stroke before the spark turns the gasses into the power stroke. So you have constant pressure then vacuum faster than a fly flaps it wings for lift. In doing so, the gasses can vomit back out the intake as well as suck back from the exhaust. Hence having a tuned exhaust gives just the right amount of back flow restriction, in turn the flow of vapers stops fluxing as violently, So the boost bottle is thought to take up some of the fluxing or vomiting back fuel as well. I believe for a boost bottle to work. You need a diaphragm inside the bottle to throw the vomit of fuel back. Aaa the missing link to the boost bottle. Try this if you can find one. a soft rubber ball you can crush flat in your fingers, It must fit the boost bottle. This might give the bounce back the bottle needs. Good luck.
@@supersportryder I said"pulls the fuel from the carburetor into the sump of the motor, when the piston goes up. How did you get confused? Remember the two side ports and front ports make the pressure build because of the crank pressure. This is why, "When a crank seal goes out. A motor can not pull a vacuum." if you have no vacuum, then no suction across the jets in the carburetor. As for the boost bottle. It is missing a key part. How you going to get a racket from a rubber ball?
Thank god there is someone else who lives in reality...just 1 of the reasons I subscribe to this awesome channel. Boost bottles only boost egos not performance...I wanna see NOS and CO2 inflators.
yeah definitely, you need some sorta propellant
might beable to do it with an oxidized ethinol
Hahahaha. First thank for your genuine videos. Your not out to promote or trash talk....just what an honest opinion for your experiences. I am a first time buyer of the 66cc/80cc Amazon China 2 stroke. I've been tinkering for just over a week....tore the motor right down the day it arrived (I took small engine repair in junior high school so I know how most factories pump engines out). For whatever reason this boost bottle article or perhaps an ad non the less I got sucked in(anything I can do for just a little bit more efficiency and ummmph). I sure wish I had see this video sooner. Dang. No matter how I work it I do need the offset intake. I noted how you tested for leaks on the welds. Thank you. I had another method in mind and yours is next to zero extra dollars and effective. I'm in the process now of mounting a Bluetooth boombox I diy'd into the frame as well as wiring in (totally separate from the bike's electrical)an Amazon headlight and rear signals w/tail light to a set of actual Street bike handlebar controls. I noticed you have a video on electrical. Just going that way now. Again thank you for your time and efforts to get information out to inquiring minds. From a covid free Canuck Cheers.
Thanks man! I have also been thinking about using some of those water proof Bluetooth speakers to make a bike radio for a fun video, as well as an alarm system :P ... Good luck on your build!
Thanks for saving me the time and money. I agree that it should be able to convince me without having to find some minut mileage or acceleration gain. I think you got it right and it helped a few mistuned motors but if it was what we wanted it to be their would be vids of people drastically improving their acceleration and the crashes likely to occur if they had a bolt on nos kit for a 49 cc 2 stroke. For now only highly competent people are the only ones making insane lawnmower motor bikes but soon enough someone will make a conversion kit to run jet fuel or something nuts and the fun will begin.
Nobody's ever accused Bikeberry of being honest about all the products they sell. They sent me a bum $100 4 store transmission. And then refuse to make it right after sending them numerous pictures upon their request. I hear a lot of people talk trash about gas bikes, but they always been straight with me. Bikeberry not the case.
Do a vid with dual carbs😁
I put the boost bottle and high performance carb on. My low end was terrible so I popped the end off my stock muffler and now I'm happy. You need lots of air flow, at least at my altitude of 5,000 feet.
Nice video but I had that same intake without the hole in it for the line and that seriously hurt my bikes throttle response and it would usually bog out and die. I found that out the hard way lol back when I didn’t know enough about how 2 strokes worked and air doesn’t like going through corners!! Keep up the vids
I agreed, the offset intake is junk. I can retest with a cnc intake, but at that point it would only be to push the topic further for "boost bottle fan boys"...
Never had a bottle because so many mixed things
that intake must of been all loose and getting no compression , try reed valve, test suction under water. i had to seal all the welds also
That thing that gets me thinking is, how do we even know that they fill those bottles with nitrous oxide from the factory? I noticed in your video that the "boost fuel" flowing through the clear tube was a liquid. Nitrous oxide by nature is actually a gas. The only time it is in liquid form is when it is mixed with gasoline, called a wet trigger system, which you didn't have on this setup. I greatly appreciate this video! You have definitely changed my mind. I almost bought a boost kit for $100!!!!! Thank you so much!
Originally boost bottles were empty chambers that used resonation. It's beyond my knowledge, but they have to be designed and tuned for the motor. This one is not.
@@LAHover I see. That makes sense. I didn't even know these were on the market. Now I know what not to do buy though! Thanks again! After I looked at the listing I found again, I did actually mention that it used true NOS. They come in cartridges that look like Co2 cartridges found in BB guns.
I know it's been a while, but I just built my first bike a few days ago, so I'm watching everything I can. Anyway, I JUST saw that "squeezed the tube" video like 10 min ago. Might be my first motorized bicycle build, but far from my first motor, and I KNOW that the positive effects of an intake booster - on a motor this small - would be so negligible that you would need technical equipment (and very precise tuning) to find it. At most - slightly improved MPG and barely cleaner emitions - NO performance gain. I seem to get the most useful, or worthwhile, tweaks from your videos. If I find a good idea somewhere else, it's usually something I've already heard from you. Thanks for all the work and good info.
I like your last name........I sure wouldn't buy a boost bottle but would try a free DIY one. I just watched the Thunderhead video, he said it #1 used less fuel to idle/ Increased MPGs #2 gave him a couple mph extra top speed. I think on the right setup with the right intake,(not have the hose fitting down inside blocking the intake airflow) it could help but just switching to a reed would most likely be a better overall improvement. They probably did work on old dirt bikes since they were tested by engineers & came stock on bikes. They were probably discontinued due to a better design engine/carb/intake,etc...
You do a great job really think it through on your tests and videos. I just came across you and after watching this video I smashed that like and bell. Keep up the good work
Think water hammer. Most water pipes in code have hammer arresters. Those have pipes reaching them the same size as the pipe. You'd need an actual tee. Just making your intake longer would do the same thing. If those work, then your intake needs rework. Just use a reed valve. Same thing. Keeps it in the crankcase.
You're vidios have great content brother! This one will be big, bet!
A well-tuned carburetor and a SHORTY ALUMINUM. INTAKE is best for PERFORMANCE...
6:00 it doesn’t prove it works or doesn’t, it’s to show how to make a poor man’s kill switch😂😂 Love your videos❤️❤️ and I’m thinking about making a “short” video on a boost bottle as well since I’ve never tried one before! Thank you for the knowledge!!
I tried one on my gas bicycle engine too a while back. I didnt notice any improvement so removed it.
Ok so it actually takes 4 boost bottles. First convert motor to run on alcohol. Fill the tank with alcohol. Then fill all 4 boost bottles with alcohol run tubes inside the bottles to the bottom, use t fittings to connect all 4 bottles together. Use one last tube to run to the operator. Now both the bike and the rider get a boost :)
Legit!
Thank you, I had questions of how and why boost bottles worked... it's a start....
I never thought boost bottles did anything. Your 100% correct
You should buy a nitrous kit
Never heard of a boost bottle until I got into motorized bikes, I was a dirt bike and 2stroke Kart racer and never saw anything in my time, now that was back in the early eighties to mid nineties
Great video, very much appreciated! Hope you read this and help me understand something. I built my first bike, lots of fun and all that. Have a 44 tooth sprocket and an HP carb...but can only get to 22 p
Mph best speed. HP carb only has 1 screw for idle( I'm assuming) so should I focus on a larger carb jet? Appreciate any advice, thank you!
Thanks.
The carb could be affecting performance, but there are many other things on a build that can effect it as well.
An NT Speed carb will easily get my 210lb butt up to 45 MPH. So I imagine the HP carb could do about the same with the right jet...
Fill the bottle with race gas and put a valve on the top so when you open it it dumps into the engine.
You have helped me so much with my build
They're made for tuning a reed set-up. You're the man brother! Top.
Personally I have bought 4 motoos kits and I like them (knock on wood) they haven’t given me a single problem
Count yourself lucky. I’ve had 2 of those motors blow up from overheating.
@@ZeldaNumber17 maybe where you live it's to hot? I own one and never had a problem with it either
Same lol I have also only had issue with one base gasket leaking caused to overheat on a hot day..the rest are little torque monster's all stock
@@glenssmallenginecreations I know and little problems like that mean nothing simple fix
Model airplane engines and 2 cycle motorcycles use similar principals in their design the difference is that crankcase volume and shape produces the pumping effect to move fuel/air into the cylinder. I think boost bottles went away because engine designers got better at the volumetric flow design. The only thing i have ever see a boost bottle is improve idle and they are far larger than a co2 cartridge. . The boost bottle set up on these bike engines won't work for a specific reason. In order for a boost bottle to work the intake and exhaust gas pulse have to be matched. The exhaust volume is far larger than the intake. Look at a tuned pipe exhaust. Have you ever wondered why it is so big. That is why tuned pipes are used on higher performance engines. 2 cycle engines have to have back pressure to have a good power band. The exhaust pulse heads back to the exhaust port as well as leaving the pipe.That return flow holds more of the incoming intake charge of air/fuel in the cylinder. That is called scavenging. Now if you attach a hose to an intake you have a vacuum source. That bottle becomes a vacuum tank. I saw in the video the guy pinch the line and it dies. I think there is a vacuum leak and a very rich mixture. If you cut down air flow by pinching the line you just choked the engine.That is why it died. By adding that line you just made the intake volume bigger, now that will give you a lean mix unless you richen the carb mixture. That part is closed off but not the rest of the intake But it is dead space. You now have the volumetric equivalent of a hotdog in a hallway. I think everybody needs to stop hyper focusing on the boost part of the power process. This is a cheap Chinese engine Not a Celica GT engine! The best gains to be had is by cleaning up the ports and making sure the intake pipe has a good seal, look to see if the pipe is aligned with the intake port . My engine was off by intake pipe was mounted 1/8 of a inch So i got lousy airflow and a perpetual lean condition. The factory pipe is pretty good but if you want it better get a tuned pipe exhaust. Put a nkg spark plug on it and Get a real ignition wire and install it on the coil.It will run much better. My dad had a old mechanic that worked on his cars used to say keep it simple cause if you are fixing it all the time it is as worthless as a turd in a bucket of hammers. He is right. Make it dependable and you will have more fun. These are my thoughts on this subject.
The video you were talking about is thunder head 289, he is a smart guy but if you watch his videos on the motorized bicycle kit you can tell he doesn’t really know much about two strokes he is good at working on old cars though lol
Video definitely helped me out,thanks man. I wasn't sure about the things,but everything you said makes total sense. I won't be getting one of these. No matter how cool and shiny they look lol
Glad it helped!
Do you realize how long it is going to take for this booster bootle idea to finally fade away and be forgotten? 100 loooong years.
i watched that other video and kept waiting for proof a boost bottle works. But all he did was pinch his hose.
Nice video. Malossi makes one of those ,that might have a reason. Because they add a spring inside,to compensate. Don't know how much it counts,but .. :)
You hit it on tthe head. Gimmicky is all. The Yamaha bottle disappeared for a reason, it didn't do what it was designed to do in the useable powerband.
Great video thanks so much for making it!
My new build is holding up pretty good. I built it based off your yd100! I got a road master granite peak like yours, got VERY lucky on a motorized bike kit. Got everything on and today drove through the snow! Very fun build! After watching your videos, you encouraged me to build one. Best decision I’ve ever made! Thank you so much!!!
Also I might add that grinding the bent end of a Allen wrench down helps to get that bolt for the offset intake tight
Whenever you have a tight spot where an Allen wrench won't fit because it's too long, you get your grinder or Dremel with a cut-off disc and trim the short end of the Allen so it can fit the nut in that tight spot. Make sense ?
Looking for some ideas to boost performance on my China doll as I live in the mountain range and need uphill performance. Guess I'll be skipping on the bottle
Will you be making a video of the new exhaust muffler and that I think it's a new sprocket adapter looks different would that be for this Friday coming up?
What color is that on the Cranbrook? Did it come like that or did you paint it? Love that color of blue
THE BOOST BOTTLE DOESN'T ENHANCE PERFORMANCE, AT ALL AND NEITHER DOES THE REED VALVE'S, HAVE NEVER IMPROVED PERFORMANCE EITHER....
Hey, I Hand made my own Boost Bottle. It's NOT that difficult. I hand make ALL my gaskets. I "Lock Tight" every thing.
This is my 5th summer. This is such fun HOBBY.
I'm a small engine nut.
I found the same stuff concerning boost bottle.
Going with High compression head, Tuned pipe, and Jets, is, for me, is the way to improve engine running.
It was so hard for me to find a dang intake pipe without the boost bottle. The previous owner of my bike just bought one and taped off the hole
My little 80cc already does 50 mph so I don't really want to mess with that
How tf, what kinda upgrades you got? Mines stock and does 30mph max.
@@Oli420X that my friend, is the power of gearing.
The only analogy application of anything I know that anywhere close to a boost bottle is on a vortex Chevy. The intake tube has a bulb designed into it, but if you look at the opening to that void to the intake is as big as the tube itself. So a hose isn't going to transfer or balance any pulse happening in that area. Even Chevy guys toss that and K&N it, which doesn't have a boost chamber void thingy.
Snake Oil 😆
Good old Motocross Action Magazine!
Good video I heard about these boost bottles are they any good
1st off did you start the 20ml test with an empty carburetor? As the 2nd half of the test the carb was empty and you put in 20 ml that 20 ml had to fill the bowl and line that was full on the first part? Do you understand me? Boost booths work by smooth out the pulse on a piston port. Thus leaning out the mixture. Did you notice less fuel puddling in the air filter? I did. I went from a 55 jet in my sha to a 62. But it got better mpg.
Great video I was on the fence about it just because for my latest build I realized I will need the offset intake. Obviously snake oil, wouldn't want to lose power to gain 1 mph
I love my seeutek kit also. runs really smooth. i have a kent bayside also with a square head. keep up the great work!
Im installing a case reed on a new yd 100 at the moment. CHD power carbon fiber petals with polished outer case. PWK 21mm carberator with a ZM 65 expansion chamber p y. Straight shot to the crankshaft and right up to the tranfers. Standard cylinder built for low end power but can breath too. I trued my crankshaft by hand and hammer. Almost perfect balance. I use a dial indicator on the bearing race of the crank then spun it and set it.
You are creating an unnecessarily strong turbulent flow in the intake manifold with that which definitively affects the combustion enough to lose a mph.
The problem is clear when you know about how important it is for the vaporized mixture to enter and exit the chamber without facing any obstacles in the way.
What do you think of the ANBULL motor kit??? Have you tried it or heard anything about it
I can't stop laughin' Good to see you. I got a side mount 24v electric kit & a folding 26" bike, both brand new. Gonna play with that for awhile.
Are you planning to make a video about it?
I thought maybe the boos bottle intake thing might catch the carb back spray at high revs but yah that other guys video didn’t explain anything except how to shut off your bike with it
Boost bottles are garbage. Thanks for the video, well done. I can't wait to see those goodies that you teased us with there at the end. New sprocket mount for rear wheel and a new intake piece. Hurry
I think some kits like the bt110 (in my experience run rich from factory and 4 stroke) so for those kits it would make the bike run leaner and it wont 4 stroke so people think it gave it more top end speed when really its just running rich
finaly someone that nows how to make a simple video talking about boost bottle
Hey hover! Love your vids. That fuel resistant sealant... what was that by chance?
"Seal-All" Come in a yellow squeezy tube. found it at AutoZone.
I have boost bottle on my bike when I installed it on my bike and did have a difference in my performance it actually increased my speed about 5mph faster and was able to attach it to the 40mm neck for my carb
i had to put two on get the more low end effect for torque most part they say give more gas miles 2 thumb up
There are *ball-end* Allen Wrenches, Bondhus (and others, possibly) brand.
If memory serves, with Yamaha the idea was to gain low-end torque, and on their Enduro bikes they kinda-sorta worked, but they were just unsprung weight on the Motocross bikes, as they didn't do anything. My cousin had an IT490 that had a bottle, and he removed it and capped the hole...
Oh yeah, you're probably gonna like that pipe. I have one on mine, and there's a noticeable difference in performance from the stock pipe, and haven't burned my leg yet either!
same here. it really depends on the engine tuning and powerband.
Just a thought An on off switch for the flow to bottle. Once up to speed switch it on? Just a thought.
From what ive seen, boost bottles just help with back pressure on two strokes by creating a consistent vacuum. So it wont really do much past about half throttle. And i believe reed valves do the same thing, but alot better, making them pointless.
Great video as always man
Appreciate it!
Does it act like a reed valve sorta? Helps you increase speed at begining and then it keeps going normally?
Need to cut end off of the bottom of the boost hose connecter it could be blocking the flow like you said LA Hover
I tried that same boost bottle kit a while back and mine also came with pinholes in the intake manifold.
Hi LA, DO YOU HAVE A RDS HAWK?? Thoughts on tbe bike? I'm thinking about getting one delivered.
Nitrous next ??
I ran a boost bottle stock NT carb and it ran fine rode the hell out of it. But way it works most 2 strokes on compression will spray out fuel and air mix out thru the air intake. Boost bottle catches the fuel and air mix and puts it in on the next cycle
Oh and I like how you ended the video got two of those parts on my bike huffy cranbrook with zeda tripple 40 motor and gt6 head
the best results come from a combination of expansion chamber and boost bottle. not a stock motor. you cant really expect this test to valid in my opinion. do another one with expansion chamber and boost bottle. then i might believe your results.
I put a boost bottle on a 50cc Moped and it sucked. I had to adjust everything and it never ran as quick. Looked cool though.
You are going far.
I know almost nothing about this, but as a curious person that knows just a little about two-strokes willing to play devils advocate.
if there is something to this, im almost certain that this is a strategy for more efficiently clearing and/or charging the cylinder that would require tuning of the intake hose length and/or exhaust.
If you think about something like a pulsejet or even a hydraulic ram pump I could see how this could do something useful for a twostroke, and you wouldnt see it on a racing bike, because they are doing that same kind of harmonics tuning with custom intakes and exhausts, and they certainly are.
whether or not its a bad system I dont know, the intent behind this is almost certainly something like taking the high pressure wave that builds up in front of the inlet when it closes and instead of letting it dissipate into the atmosphere, reflecting it back towards the inlet so that it arrives when the bike is looking for more air. even modern production minivans and econoboxes are engineered to try to recover these kinds of losses these days, the racing bikes are too. What isnt engineered to recover these losses, is $50 two strokes from a whitelabel factory in china that come in a kit with whatever muffler and intake/carb was available and cheap.
Someone that knew what they were doing might be able to take that same kind of tuning knowledge and with less overhead than a totally custom intake/exhaust adjust the tube length on one of these bottles to make a dirt cheap two-stroke give a little more within some rpm range, by adjusting the length of some rubber tube.
all that being said, if there is any merit to these things working, its never going to be a "bolt-on, go-fast, wash your hands" project, its going to come from an engine builder that does a bunch of voodoo math to give a ratio for the size of bottle, length of tube, displacement and desired rpm peak and ships it.. without that, the likelyhood of hurting engine performance should be about as high as helping it, if youre reflecting the lowest pressure part of the wave back to the engine when its looking for air, youre not helping.
Good work! Thanks to share the information and experiences!
When starting my bike I usually get it running and rev it a little so it doesn't die stop the bike and rev it until it will Red line without dying and that's how I know it's warmed up sufficiently
I have a 100cc bike motor on a aluminum frame trek mountain bike and it only top out at 20mph do you have any recommendations
Oh god boost bottles for me have been a vacuum leak nightmare. I tried one and got a super rich fuel mixture, ran good at lower to mid rpm but it wouldn’t wind out :/. I tried different jetting as well with the stock carb. If the stock carbs had a fuel mixture screw. or if the bikes came with a more complex carburetor. I’m sure someone could get them to work better than us average joes. I found that a richer jet works good for high end with the boost bottle but it won’t idle well (fouls plug).
Edit: I didn’t notice much fuel efficiency difference with my tests. Just a weird power band
oh this, yeah, its used for Nos injection kit (go kart) Amazon. Handlebar trigger to manifold and thats the boost. Toss the bottle and use the line for the Nos for quick boost.
Bottle use needs to go to crankcase not in manifold. You might as well soak all your old carb filters in gas and stuff it inside boost bottle(BBR BOOST bottle has cap that unscrews on both ends with o-ring seal... beautiful CNC work btw..) anyway, and use fumes...of anything....fart into it...get a genuine temp boost....but if you do that put a valve on manifold...to nullify system if you cant collect
another use for bottle: make a fuel reservoir including the old supercub petcock with a reserve(Fuel Gas Petcock Replacement for Honda CRF 250 450 X 250X 450X Petrol Valve #H64)
Idk
-_-
heres a joke:
WHAT KIND OF TEA IS HARD TO SWALLOW?
REALITY
TEA HEE
HA
HA
:)
Falco - Rock Me Amadeus