Power Loss? What Is 4 Stroking On A 2 Stroke Motorized Bicycle?
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- เผยแพร่เมื่อ 18 ม.ค. 2022
- Here's some help on that pesky power loss at maximum RPMs on your 2 stroke. It's called 4 stroking.
Basic Porting - • How To Port Your 2 Str...
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finally a video that makes sense, simple and to the point and doesnt spend 20 mins of nonsense and tangents
I have been running without any air filter for quite some time thanks to your suggestion. I wanted to see if what you were saying was true, and you were right brother. Thank you for your informative videos.
Glad I could help
good advice buddy . glad to see ya post .
More to come! I've been goofin off playing w/ my toys. Thanks
Your videos as great, good information all the way!
Thank you very much. This was very informational. Now I’m on the road to making my bike as fast as it can be.
Glad it was helpful!
Good video and the speed carbrator iv never had luck with it I switched back to the nt carb sadly
Good stuff. Thanks for the tips.
Thank you for the information , very helpful for this beginner
My pleasure 😊
If you get one of these kits you might want to get a new spark plug that’s not genuine it’s a great improvement
Thank you for the reminder.
Any time!
You can adjust A/F ratio on the carburetor needle by moving the c clip upwards to lean or downwards to rich the air fuel ratio
That only works up to 3/4 throttle, then the main jet takes over but yes indeed it can help on low to mid range
More of a question I have a 53 CC 4 stroke engine it's generic got from Walmart I don't always break my belts on my transfer but it happens time and again what sort of replacement belt should I get to replace the old one and is there a belt I can get from a auto shop that will replace that belt
and if so do you
Know the type and part number thanks love you dude your always a great big help when I get a little lost or just forgot something thanks again for all your help
Wish I would have watched this video a long time ago would have saved me a lot of questions and aggravation. From what I read they tell you when you do a plug shop to drive one mile. Is 30 seconds the minimum or how does that work
In the good old days mopeds seemed to be set up exactly. Got just a little 4 stroking at max rpm. Unless it had been modified.
In the saw world it’s set up so max RPM no load just starts to 4 stroke. This assures me it isn’t likely to burn down. Lean is mean until it isn’t.
Thanks Hughe, digging the tats and the shirt 😂 I definitely need to try re-jetting sometime soon. First I gotta do the basics and check my squish after decking my head and removing a head gasket as it wasn’t sealing before, but I was too lazy to deck 😅
I'm kicking myself for not tearing engine apart and balancing the crank. But....the engine didn't come with cheap screws/bolts instead of the better allen/hex head. They were on super tight and stripping so I quit, any engine you wanna try to make fast really needs balanced first.
Thank you, Eugene! I ask, and you answer. 👊
My pleasure!
@@HughesMotorized I’m trying out a Boafeng NT carb. They don’t have that plunger/primer setup and use a spring-loaded bowl drain. The only drawback I’m finding is the main jet is different than the stock NT’s. Any idea where to find jets for the Boafengs?
Shake tat is rad brotha
Shake zula tha mic rula
What are you doing your bike turns on it runs but only goes like 5 mph new engine new carburetor everything else is slightly use put a new engine in the carburetor connected the wire and everything and when I turn when I turn it on it started up it only goes like to mph 5 I need help please 🙏
Can you help me my bike starts and revs but won't move it just stopped going all of sudden four stroke motor
Great video! Easy to understand. When running without the air cleaner is it just the filter foam that is removed or is it also the housing cover as well? Thanks for the video.
Both
Thanks.for that. Now I know Im heading in the right direction with my efforts.
Glad to help
I love that you have a Master Shake tattoo on your arm :)
Me too! Also have Meatwad, Frylock AND Happytime Harry w/ his Red Glitter Dancing Shoes!
So I have a great idea of what's wrong now. I bought a Bullet Train kit from Bikeberry and was given an adjustable exhaust pipe. Yeah, adjustable. The gasket I was given was almost like a copper o-ring. I had a spare exhaust gasket that I thought would work but it was too thick and covered a decent amount of the port. But I was wondering if that would also cause the engine to backfire loudly and stall if it has an excess of exhaust gasses?
It's called port matching..port the exhaust gasket so it will match the exhaust port on the cylinder as well as the intake side of exhaust..
Also you can use exhaust header wrap..it helps the heated exhaust air to travel throughout your exhaust faster..
Please make a very detailed video on jetting and plug gap and plug chop. Please
Good idea
Hi there isnt big differemce between #66 and #65 size jets is it?
Since my last visit I've learned a lot about tuning.
It 4strokes at 3/4 rpm. After that it picks up and revs all the way out. WOT all the way through but one stupid rpm range. So frustrated. (Filter removed, 66jet, removed cap and the plug at the end that holds the bolt that holds the cap so it's a straight pipe, and the needle is set to leanest position, plug at 25)
The plug is oily around the base the electrode is darker than brown.
what oil/fuel ratio are you running
@@topdog3407 4oz per gallon. Its marine 2cycle oil.
Usually a bad gasket somewhere makes it do this most of the time or the pin set to far down on the carb making it too rich
Main jet is for open throttle. Needle is for 1/4 to 3/4 throttle. 4 stroking is referring to full throttle @ max RPM. A bad gasket will make it run poorly from idle to wide open. But ya, if the clip is too low on the needle it will run rich 1/4 to 3/4 throttle.
@@HughesMotorized yes correct I noticed this problem just recently when my exhaust had broken just before expansion chamber started making brappp brappp noise at full speed
I had an idea watching the video could you route the exhaust through the frame of the bike like you can with your cables that would be a cool idea
If you want your frame to be 180° lol
@@mitchellfultzable Yes I know the frame will get hot but wouldn’t it be cool no wires no exhaust pipe I think it can be done but you’re building 100% custom bike frame you might be able to get away with using one of those West Coast chopper bikes
Could the magneto magnets, that are broken in half/pieces, have to do with the 4 stroking due to loss of magnetism or something?
no. jetting and engine balancing are the issues
@HughesMotorized I think its not 4 stroking at half/full throttle but at lower load, not too sure. I gotta balance the crankshaft tho
Can anyone reply I have a 80cc I've been breaking in but when I go past half throttle the rpm seems to plateau I have the black carburetor cover off with just the sponge on and the air needs to be all the way down to even get that much power
Remove the cap off the end of the muffler and your supposed to have choke fully open
I have a phantom 85 kit and i cant get it to idle out of the box. I have to give it quarter throttle to keep it running. The air/fuel adjustment screw has no effect on idle. I was told i need to change jets. Im 500ft above see level. What size jet would you recommened?
Check for intake leaks first. Stock jet should idle even at 500ft
I live in FL sand everywhere, will this get in if I take off air filter?There's a guy who drilled holes and keep his filter.
Be a rebel. Try it!
Back at again
If i remeber right, the motor manual writes that the spark plug gap must be 0.4-0.5 mm. I am using an NGK B6HS spark plug. I a near at sea. With wider gap there will be problem with the cylinder?
Bigger spark plug gap makes a bigger spark up to a point. The larger the gap, the more voltage is needed to jump the gap. Most experienced tuners know that increasing the gap size increases the spark area exposed to the air-fuel mixture, which maximizes burn efficiency
@@HughesMotorized This maybe cause any damage at the top of the cylinder?
What do you think the culprit is for 4 stroking in low rpm range? My engine 4 strokes until past 3/4 throttle. Then it screams at full throttle sounding a little lean. Plug looks perfect brown. Current clip position 2nd notch from top. I tried top notch and was way too lean. Also I've inspected thoroughly for for vacuum leaks repeatedly and none found.
adjust the carb needle, it affect it until about 3/4 throttle, move the clip up
@@bored496 I have tried every needle position. That's what I was referring to when I said clip position and notch.
When mine is full throttle it four strokes and I checked the spark plug and it was black do you rekon I should go leaner on the jet?
Yes. Sounds correct
Did you get a leaner jet? Did it fix it? Just learning about carbs / jetting rn.
How lean can one go without danger? I have done a lot of work on my bt100cc BBR...I have ported and port matched my one-piece cylinder/head.. remove all but one piston ring, done the piston intake trim mod, removed air-filter, reversed cylinder, added thinner base gasket, added velocity stack, #68 jet..retard timing by 5%, added long tube expansion chamber..etc.etc...still trying to get more top end out of my 32t rear sprocket on 20inch wheel...
But still wanting more top end!
What do I do???
Check out 2 Stroke Stuffing's channel.. I'm just a put it together, get it running good, custom bike kinda guy. More about the basics. Others like him, Ethan Smolik, and Don Butler are the pros at getting max performance.
Do you think it's worth balancing a crank in a stock motor I'm not planning on going crazy with mods but I have access to a drill press and it seems pretty easy but if you're not going for a race engine is it worth it 😉
If you have the skills and do it right, then yes balancing can make for a better running engine. Is it mandatory? No. However some are better balanced than others from the factory
How much does your engine vibrate?
Iv'e only had 1 bike engine so far but from what Iv'e read. I think I might have got 1 that is a bit better balanced than a dud engine. But I don't have any balanced crank bike engine to compare it to.
It vibrates a lot if you rev it up with the clutch pulled in sitting still but most vibration goes away once I'm riding/moving. That's very similar to how my Buell/Harley V-twin engine is. Vibrates like crazy at idle & revved up in neutral but 90% goes away once you're in motion.
I notice my 4hp, larger cc, 2 stroke snow blower seems to have less vibration than my bike engine. But just might be because it has rubber engine mounts. Wish I had a balanced 2 stroke bike engine to compare with.
I guess I'm gonna spend $50 more on a VM22 carb & G2 reed kit. The windowed piston will be a slightly lighter, so I'm curious to see if I'll have slightly less vibration.
I heard you can get just as much or more power than a reed kit by just using bigger/better carb & proper port work. But due to clearance issues, I'm gonna give a bigger carb/reed kit a try. If it'll get more power, slightly less vibration & stop engine from spitting gas out the carb. Then I think it'll be a win.
Can you spare a cylinder and piston for my cheap 49cc motor?
I don't have any on hand.
I ordered a whole set of 5 mm jets for my NT carb and then find out it needs 7 mm. Everyone is saying you need 5 mm. WTF is going on??
So while holding wide open for 30 sec blew up the motor!! So maybe not tell people to do so. I never knew that to be good on any motor😢
Bs. If you can't open throttle fully gor 30 seconds you did something wrong before you got to that point
Bs if you cant go wide opn for 30 sec you did something wrong well before this point
Won't the removed air filter cause dirt to get into the engine and scratch the piston?
Motorcycles have been running open for many years 1890s to 1960s bikes were pretty much all open
@HughesMotorized makes sense, probably for racing and short runs but for longevity I doubt there's too many dirt bikes in the trails or Highway bikes that run for many thousand Miles without an air filter of any kind, without any scoring from particles in the air getting into the draft of the intake
@@Classycardrawings BSA Gold Star, Royal Enfields, Ducatis, Moto Guzzi road bikes. Many came stock without a filter. Most before 1955 did
www.nationalmotorcyclemuseum.co.uk/birth-of-an-icon-1962-bsa-rocket-gold-star-650cc-prototype-used-by-chris-vincent-for-sale-with-hh-classics/
www.yesterdays.nl/product/bsa-1955ca-gold-star-499-cc-1-cyl-ohv-3407/
Good Tshirt...😂
Just remember, too rich causes power loss and fouls plugs. Too lean seizes engines and burns holes in pistons. Be very sure it is too rich before going to a smaller jet, and only go down ONE size. Then keep a close eye on the plug. It should be a dark brown, but not black. I am not a fan of "plug chops" To me that is a gimmick that really doesn't tell you anything. I like to put 25-50 miles on a plug, under different riding conditions, and then check it. If your 2 stroke engine has been fouling plugs, and you didn't mix too much oil with the gas, you can safely go down one size and put some miles on it. And remember, an engine will always run best when it is right on the edge of being too lean. That is something you don't want.
I Like the Blah,Blah,Blah
Do not use the original carb it's trash use the 20 bucks to upgrade to a hp carb