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- เผยแพร่เมื่อ 3 ต.ค. 2024
- This is a homemade bottle style carburetor synchronization tool ( homemade manometer ) and balancing tool. If you are going to attempt to, or want to know how to sync your carburetors, there are a few things to know first.
1. Carburetor Synchronization = Adjusting your carburetor throttle plates or throttle slides so they move from your carburetors idle setting to wide open throttle simultaneously, or in sync with each other.
2. Balancing Carburetors = Adjusting your carburetors so they allow each cylinder to flow or pull the same amount of air and fuel at your desired idle speed. Carburetor sync and carburetor balancing go hand in hand.
3. Idle speed screw adjustments must be made at normal operation temperatures.
4. Air fuel mixture screw adjustments must be made at normal operating temperatures.
5. Air fuel mixture adjustments only affect your carburetors pilot circuit, which means from idle to part throttle. Air fuel mixture screw adjustments have zero effect on wide open throttle.
6. Carburetor running rich = Too much gas not enough air.
Carburetor running lean = Too much air not enough gas.
7. Wide open throttle rich or lean conditions are adjusted two ways:
A. Carburetors with throttle slides have a clip on the carburetor main jet needle. Raising the main jet needle clip drops the needle deeper into the main jet and will lean the carburetor out. Lowering the main jet needle clip will raise the needle and enrich your carburetors mix.
B. Carburetors with throttle plates (butterfly style) need to have the carburetors main jet changed to a larger diameter jet to richen the mix or a smaller diameter jet to lean your mix.
8. If your engine will not idle correctly or your air fuel mixture screws seem to have no affect on the engine at idle, then most likely your pilot jet circuit is clogged and you should clean it.
The snowmobile in the video is a 1986 Arctic cat cougar 500 fan cooled, it has Mikuni vm34 roundslide carburetors which have a primer nipple on the engine side of the throttle slide. Perfect place to attach a homemade manometer to balance everything. These mikuni vm34 roundslide carburetors were common on many motorcycles, snowmobiles and atv's. Suzuki, yamaha, polaris, arctic cat, all used them at one time or another, they are good carburetors when they are dialed in.
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Hey Mike, Thanks for the info! I built mine using sauce jars and some $5 tube from Home Depot.
She runs better than ever!! I will try to remember to post a pic later!
THIS WORKS, PEOPLE!!!!!
After 56 years of motorcycling, I finally got a twin cylinder bike... Looks like I need two plastic bottles now. Thanks for the video..
Mike, I thought I had an idea on syncing carbs before I watch your video...I had no clue. The way you explained it is flawless and well enough that anyone could do it and you took the fear out that I had that I would mess something up. Thank you. I can't wait to try it and see how well both my bikes run afterwards.
That is the best damn tutorial I've seen yet! Great job! It is so simple yet so important. Again, great job!
thanks, I appreciate that and try to pass the info along the best I can
Jonathan Williams
The sync he is talking about @ 6:30 is a bench sync (you set the slides so they open at the same time so that each carburetor lets in the same amount of air into its chamber). The other sync is vacuum sync...that's where the plastic bottles are used.
Bench sync first before vacuum. Bench sync is a good point to start first, and can be done without much tools.
Vacuum sync needs balancing each carburetor in order to have the same air pressure(negative pressure) on each of the cylinders.
Valve clearances are better to be set first before even thinking of syncing them, but, that is not the case.
@@ruikazane5123 Yeah, not here on a 2 stroke.
Great help, the narrower the bottles, the more sensitive the gauge response, I think
I like your workbench with the round tool holders
Those are beer holders
mate that was really helpful … and nice to see a home-made method that blows away all those claims that you need to spend hundred bucks on a special tool! Thanks for taking the time to share that :)
Very mechanically inclined, creative, and I really liked the explanations. The accent was awesome!! Thanks for a great video!
Three and a half minutes in and I'm already giving it a like. Thanks for your time.
Excellent, followed what u were saying and it all made sense and I learned something. Before I always thought balancing the carbs on my old Honda was beyond me, some tricky magic I'd have to get someone else to sort, so thanks a lot to you and youtube, well worth watching.
Cool Video. I need to attempt this for my 3 cylinder XT snowmobile. The slides are totally wrong, so your video really helped me to figure that out. Thanks
That is a excellent homemade tool and lesson . Thank you for sharing...
I didn't know Robert De'Niro made instructional videos.
LOL
You talking to me???? I;m the only one here.... You talking to me????
Sounds nothing like him bro
Nice
Ha I was thinking this too!
That funny! Your so right! Lol
That's very CLEVER . Congratulations. From France.
Great easy to follow video ,love the milk crate vac bottle stand- nice and stable.
Now time to sync and tune a triple and twin. This explained everything so simply thank you sir.
very informative, clearly explained, i now know the diff between Balancing & Synchronization.
OH YES INDEED, IT WAS HELPFUL. WHAT A "SIMPLE" WAY TO FLOW BALANCE
MULTIPLE NORMALLY ASPIRATED CARBURATORS. NOW MY HS-4 SUs
ARE CONDEMNED TO BE IN BALANCE. THANKS.
Nice homemade manometer. FYI: If you bleed the air from that short transfer tube between the bottles, you'll be able to dial it in perfectly level across the bottles. Now I've got to add a third bottle to make it work for a triple!
This is what i was hoping to find,easy simple method of getting both carbs in unison,thanks ill be ready for snow.snooky pa.
This is a great idea, if I could suggest using strong bottles ( Glass) as my plastic bottle rig just collapsed. I have a 1000cc motor which obviously creates lots of vacuum.
Great idea and I'm sure it will work perfectly when I get some stronger bottles. The ones I used were fairly thin plastic and instantly collapsed as soon as I started the engine... DOH!
😆. had a Homer moment "Doh!". lol
@@jake_break9185 not kidding. Moment of panic as I watched the water being sucked into the carbs 😨. My Mk2 version used plastic beakers with rubber sealed clip on tops. Works a charm 👍🏻.
While most of this is way different than my dual zenith carbs, I think that bottle sync tool will really help!
Thanks!
Great job explaining in great detail to make it simple to understand.
That was so easy to comprehend others make it seem complicated.thanks.snookie pa.
love old school diy videos...this is tops!
I am going to start building one of these set ups to have on hand for my sled! great video 👍👍
That's a very cool method to balance the carbs. Thanks for posting! PS,. Inexpensive as well!
Could you also make a video on how you actually go about syncing the carb slides with the drill bits? That would be great!
Me too i got lost on that step,snooky.pa.
As someone else said, I used two water bottles and the vacuum suckes them in completely and drew water into the carbs!! Use firm plastic or glass bottles/jars!
Hey man...I know this is a very old video but I tried this and it worked!....I have a Honda CB125 super dream that I bored out to 250cc...it ripps !....but I had issues with the dialing in both the idle screws perfectly....I was looking at getting a carb sync meter but it's expensive!...and this worked perfect...my bike pers like a kitten....although I must point out that I failed at my first attempt using cheap plastic bottles...the bottles sucked in on themselves for the pressure...so I used small glass Jars that come with a metal cap...thanks man !
Excellent video man, I really appreciate it. On a side note though, that poor pool table xD
Eventually all pool tables in your basement become work benches; not sorry.
Well at least put a insert plate / board on the felt?
I built one with four inputs for my 650 Maxim and it worked great. THEN I left it in my Wisconsin garage over winter. Froze, broke, start over. Hint...empty the jars! Don't freeze!
Dude, you are a genius!
cool. I will have to try that sometime just to see how accurate it is, and then use vacum gauges to check.
How did it go?
Awesome explanation..gonna try this tonight..thanks
lol, so I made one with plastic bottles as it shows in this video. The vacuum from my engine crushed them!!! FYI, USE GLASS BOTTLES!!! My ver 2.0 worked fine :)
Thanks for the tutorial I will try this with my twin su carbs (MGB)
use glass bottles snapple bottles they hold up alot better with rubber stoppers for the caps, they will work o n all engines
Very nice info. Thanks a lot. This will save me some money for sure.
Just made one of these, good idea. But the vacuum on my 1978 Honda CX500 sucked and collapsed the plastic bottles both sides. I'd been careful not to put too much water in but the collapse squeezed the contents, it got near the top of the bottle on one side and started to suck water into one cylinder. Use strong heavy plastic bottles.
Looks like he uses Gatorade bottles or poweraid should be the same 👍🏻
Great tutorial. Thank you
great video! thank you, but the idle screws only lift the slider, as soon as you rev the engine its all up to the throttle cable slack.. so your just really fine tuning the idle balance, but this method works well for fine tuning the throttle cables
I built 4 carb setup 20 years ago simple balance vacuum hose on a flat board using motor oil as the gauge. Never sucked anything the gauge is 4 feet tall with another 6 feet of vacuum hose
This is very good. Just advice on setting up the carbs before using the balancing tool was enough to get my guzzi behaving it's self . Thank you
Great work bench you have.
Thanks sir for your video. Really helpful!
Very helpful, thank you for posting this video.
Good explaination, I'll build one. Have always done at night comparing exhaust port flames. On my motorcycles. Drill bits on boat carbs or where I didn't want to remove exhause.
you would fire engine up without exhaust manifold attached to head? 😮
Gangster !
Saved me buying that $120 carb sync tool
🤜🤛
Thanks for sharing, helpfull tips.
Great work bench.
I may have to try this myself when I put dual carbs on my car.
Great video! I wish I knew this forever ago
How is this the most useful video to sync carbs in 2021
Thanks for the info and great video by the way!
Your welcome and thanks
Thanks for the tutorial
Brilliant video - thank you for sharing
great videos thanks for the info.
You can add 2 more bottles inline with the hoses to carbs which will ensure you cant suck water into the engine
This seems to me to do nothing to balance the carbs through throttle range. Yes, they will be balanced at idle, but as soon as throttle is moved they will be back to where they were when they were synced using the cable adjustment.
thanks so much for doing this video
you are brilliant man!
i used Gatorade plastic bottles for syncing my xs650. the vacuum coming off the carbs crushed the bottles like King Kong was sucking on the hoses. will remake this manometer using glass bottles.
Great little tool here. I have a manometer setup that I've used to sync carbs for quite a while and I use transmission fluid in it just in case it gets pulled into the carb so no harm would be done...but this idea is great. One thing though. You DO want the level of fluid in each bottle to be at the same height for the carbs to be perfectly sync'd. If one bottle has a level higher than the other then that carb is pulling more vacuum. It's not about stopping the levels from moving up or down, it's about the level of fluid being exactly the same in each bottle. If you have 1" of liquid in one bottle and 4" of liquid in the other when the levels finally stop rising/falling, then you are extremely out of balance.
That's actually incorrect, the level of fluid is irrelevant. All that matters is that both Carbs are pulling the same vacuum, if both are pulling the same vacuum then no fluid will travel between the bottles because the vacuum from each carb is cancelling the other out. So regardless of the level of fluid, if the fluid isn't transferring to another bottle then the vacuum is the same and your carbs and synced.
@@ledbetter1226 With all due respect, then I'm not sure you know how a manometer works. Different levels precisely means there are different pressures involved. That is exactly what a manometer does. Now, does a slightly different liquid level mean there is very much difference in pressure? No, but none the less, there is a pressure difference if the levels aren't the same. The one with the higher liquid level has less pressure, thus the liquid is "pulled" up to a higher potential plane...or rather pushed up by the higher pressure on the other side. I would say that "perfectly" tuned means equal levels. "Close enough" is levels not continuing to move.
Hi @@dilbone1 this system is not acting like a manometer, and so the principles are different. Manometers have a single liquid mass in a uniform U-shape tube with one end closed. They are initially calibrated for a specific purpose and then relative measurements are taken. External pressure verses the internal pressure of the sealed end of the system changes the height of the liquid in the tube. The system in this video has two separated liqid masses connected by a tube, where by the height of the liquid in one vessel has no impact on the height of the liquid in the other. A pressure difference will initiate a transfer of liquid, as both ends of the liquid transfer tube are at the same height, i.e. the bottom of the bottle. They only variator in this system is air pressure above the liquid surfaces in the bottles, as generated by the engines twin cylinders.
That being said, I think I agree with one of the above comments, that this will only balance the carbs for idle only. As soon as you twist the throttle the slack is taken up in the throttle cable, you are off idle and the idle screw position plays no further roll in regulating the balance of the system. So the best you can hope for is maybe better slow traffic. Close to and coming off idle improvements in smoother very low speed running.
@bobnewton6377 I'm not calling his set up a manometer. What I use is a manometer.
Syncing the carbs at idle means they have the same start point. Since they are linked mechanically I'm not sure why you're saying they would unsync off idle. However, one could certainly check balance at off idle RPM if so desired. I don't think I'd trust this set up for syncing carbs myself. I don't see it being sensitive enough
Hi. Thanks for your reply. If you read carefully I did not say they would unsinc, just that the noticeable improvement would only show at, or just coming off, idle. I hope that makes sense. 😊
You Rock Sir!
This video is gold. So the point is to have fluid level equal at idle?
correct if thats what your after, I have many vehicles some with twin carbs, some with 4, my 4 carb bike wants to be synced at 3500 rpm due to engine vibration, but most vehicles, motorcycles, snowmobiles definitely want to be synced at idle.
Mike OD always check the service manual for your engine. My 1981 Honda CM400C says to perform the carb sync at 1200 (+/- 100) RPM. The guys who built your engine knew what they were doing!
MrNightpwner No, not the fluid level, the fluid level change rate null so neither bottle sucks from the other : level does not matter.
MrNightpwner @d
awesome vid THX for making it
If the hose connecting the two bottles is filled with water, the two levels in the bottles should eventually equalize (without the device connected to an engine)
Really great video! :)
Bravo majstore
Big help. Thank you!
Ingenious! Thanks.
I agree with the principle here----He has gone to great pains to avoid sucking liquid into the carbs----but at the sacrifice of an awful lot of precision in setting the sync. This would not work well on syncing motorcycle carbs or injectors---which are synced to reduced engine vibration which 'puts your hands to sleep' Just using a plain old manometer would work better and produce a more accurate sync
has to be more accurate than gauges.
BTW, 320 grit sand paper will clean up those callouses on your wrench fingers
Great video.
Sounds like Robert DeNiro
Neato, but just get the guages man. Worth it.
Awesome info. Thanks!
well done, good video!
Cool, thanks for sharing.
Hell yeah awesome video
Great video. Use glass bottles for motorcycles. Plastic will implode.
i used the plastic gator-aid bottles and the vacuum off the bike collapsed the 2 bottles like they were nothing. replaced the bottles with glass.
Excellent video. I have one question do you think it would work if instead of using 1/4 inch fuel line to the carbs then converting them to fit the primer, if i just used primer lines all the way from the carbs to the bottles would it still work? I think it’d be easier than converting a 1/4 line to the primer
very helpful. thank you
This is a great video , thanks for the help. This is been the part that been scaring me about rebuilding my mikuni 38mm yamaha triple carb. getting everything balanced and synched seems to be what everyone has the most trouble with.
In this video you explained how the sync the "low" or idle screws. do you imagine doing the same thing with the "high" or open throttle screws?
Nice job, Thnx!
Suggest defining SYNC vs BALANCE at the start, then stay consistent with the terminology. Otherwise it's confusing. What is the purpose of meticulously syncing both barbs first, then readjusting (during balance phase) with idle screws? I assume you pick the idle RPM you want by adjusting both idle screws until vacuum is balanced and you get the RPM you want? So when done, vacuum is balanced and carbs are no longer physically in sync?
Excellent. Thanks
cool vid
I'm converting my Triumph TR6 2.5L 6cyl to Mikuni HSR 45's. I love your video and assume this same technique will work the same way. Right?
WELL DONE! I have a corvair with dual rochesters. Ive seen the $45.00 tool that you set on top of the carbs after removing the air filters for balancing them. Would I need to make something to sit on top of these carbs?...no, because that would choke off the air right?...where do I hook up the tubes on my carbs?
Wow thanks for the tip
Thank you sir.
Carb sincro
anyone else thinks this guy sounds a little like robert de niro?
i have been thinking that the whole time!
Sounds like every other New Yawker Ive ever heard or maybe BAAAsten.
So what would happen if one of the hoses that connected to the vacuume port of the front intake sucked water into the engine not alot but some
I tried it, either it didn't work or my carbs were already synced. Can you get good enough vac from the oil injection fittings?
Idle screw, idle mixture screw or idle speed screw? Make up Your mind - otherwise, nice video!
Very nice tutorial! Is there a way that ican use this when my carbs dont have a vacuum?