How to sync your butterfly valves without any special tools

[@gofres]

I've got to say, I was really sceptical that this would work well even though the theory seemed sound. I called around a bunch of local garages to balance my CBR900 carbs and none of them wanted to do the work. So I thought fk it, looked up how to do it and found this video. And have to say it worked a treat! She's running better than ever, revs with no bog from just 40deg C engine temp. Took me about 3 hours of water pouring to get it all spot on and left them to dry out for 2 days. If didn't even pull off the float bowls or vacuum. Just have it a good shake every now and then. Bike fired up after 3 presses. EDIT UPDATE: I've since bought a carb balancing tool and got it running MUCH better. Using the water method was great for tuning each carb to each other, but it didn't account for the air flow between each cylinder. After tuning it properly, and enriching the mixture by 1/2 turn, she now runs beautifully! In conclusion, this water method is handy for an approximate solution, assuming all valves and clearance is perfect. If not, you'll need to use a proper tool.

[@andymarcelin9578]

ah ha...you answered my questions...i agree with your summary.

[@gofres]

@@andymarcelin9578 glad to be of help! Given the lack of garages willing to balance carbs in my area, I really think I could start a side hustle given the experience I've gained!

[@lawrencenortje2771]

This should work for most bikes, and is a good technique to use. I personally don't think compression differences will make that much of a difference between cylinders, and this will get it reasonably accurate.

[@zappa916]

perfect! Never thought of that. I use a 1mm drill bit on the butterflies.

[@jayfbee]

A 1mm dril bit? Wow.. Didnt know one existed.

[@Ladosligese]

like a sane person would do :D

[@anthonysatchel3608]

I found your video, and This did the trick for me and I’m extremely happy l, thank you!

[@JamesJones-hu2tp]

I've got a 97 cbr 600 f, thanks for sharing this, I'm about to do this, easiest and simplest way I've seen, thanks very much, Jim

[@chadfordham1]

How did it go?

[@almirdzakulic]

I just did it works like a charm😊

[@dentwatkins2193]

Seems a lot of farting around for an approximate result. When you balance a bank of carbs you're matching the airflow through the carbs as the engine is running, that is, drawing the air/fuel mixture through the carbs. This doesn't address that as it takes no account of different draws (levels of suction) from each cylinder which can result from a number of factors such as minute differences in valve clearances between cylinders, differences in wear, in fact almost anything within the engine will make a difference. Balancing the airflow through a running engine using either mercury manometers or a bank of calibrated dial type gauges will compensate for any minor differences and you can really hear and feel the difference. Checking that dial gauges are calibrated as a set is very important for an accurate result. I started running the workshop at a Jappo bike shop in the mid 90s and one of the guys had put the shop gauges on an engine, got the needles all lined up and declared it finished but it sounded like shit. I put my mercury set on the engine and the columns were all over the place. After I'd adjusted them so that the columns were level the engine quietened down, cam chain and clutch noise disappeared and the bike ran very smoothly. There was nothing with the bank of dial gauges about calibrating them so none of the guys knew it needed doing and checking occasionally. Once it was done the balance/synch could be done with the dial set and produce accurate results like the mercury set.

[@vengefulrat3053]

Well. Just followed this on my cbr 919. Hopefully my bogging down won't be as bad as it had been.

[@andymarcelin9578]

Ah...i dont think so as the sync gauge does it at around 1000 revs......i would like to see your carbs on the sync tool with the engine running and see how it compares....also is it not the total air coming in through the filter and for that exact cylinder...so if one cylinder is not as high compression or valves leaking a bit , restricted exhaust on one cylinder...would the sync look the same as using the gauges. I dont know and its got me wondering. I think its fine for an initial setup but not the real deal.

[@unrulydamar3902]

Thank you very much for this video...learned alot of useful stuff plus you helped me to fix my carb. Blessings from jamaica bro 👍

[@jakesta104]

Hey bro is there a video on how to take out the carby lol I can't figure it out and I don't really won't do anything without seeing what I'm ment to be doing love the vid aswell ty.

[@seksei9374]

Don't have a video, if your in VIC I might be able to come help. I do also have a carb sync Theres a lil hole on the sides the frame which should expose the bottom of the 4 carb boots. The loosen the carb boots between the carbs and engine. pull the carbies out, then disconnect the throttle cable and the choke. If your stuck trying to pull the carbs off, the boot will have to be replaced as they've gotten to old and hard, and will most likely have cracks, try rocking it back and forth to loosen, then try holding the right side and pulling up on the left side. And if it's still not coming out, try putting some leverage on it eg. Like using a crowbar or pole(but be careful not to damage anything)

[@keeperlit.leterrip7722]

I thought I was smart and had created a new method when I did this on my zx11 carbs. I guess maybe it's common. I used fuel instead of water and I left the bowls on.

[@DavyJonesSN95]

Please help me, I have a zx11 and I have a ton of questions, does yours make a ticking or chattering noise while running? I just got this bike and it say for 6 years before I got it, cleaned the carbs fresh gas and oil and filter change and fired right up but it's making a slight ticking noise is it normal

[@kyle88l]

I use a vacuum gauge set on the bike, but when i take my carbs apart again i am going to use this to bench sync them for sure

[@Ladosligese]

why not use a needle ? .. or a 1 mm drillbit ? .. instead of pouring them full of water .. having to dry them out and waste xtra time haha

[@kyle88l]

@@Ladosligese funny enough I did end up using a drill bit later since i came to the same conclusion as you LOL

[@Ladosligese]

@@kyle88l lol good one dude :D glad you got it sorted :D

[@vhertiic6545]

Im about ti try this method tonight lol

[@djxponent2018]

You my man are a genius...just sayin

[@castawaygibo9661]

Im going to do this on my 1997 ninja zx7r I am new to motorcycling but dirt bikes for about 3 years 14 years ago. I can fix up cars so i think this will be easy. Is there anything i can break or need to be aware of when removing carbs or getting to the carbs?

[@seksei9374]

Just make sure to use fuel for this method, I just used water to demonstrate on old carbs, Order new carb boot rubbers, they tend to get hard over time and crack, so can be a pain to removed , main things are to take photos before, disconnect you throttle/choke cables from the carbs, either before or after removed from the carb boots depends on space

[@danielbotha345]

Thank you that was great.

[@BigDreamsLilBike]

I'm about to try this!!!!

[@Crunch8111]

Can you tell me what I need to remove? The diafragmas, the floaters. But do I also need to remove any jetscrews or air/fuel ratio screws? Thanks!!

[@AlekseiGraciasFlor]

if youre doing the method you need the carbs removed of the bike, you cant do it without dissembling anything, but its best to give the carbs a clean before, best results are always are the carb has been serviced and cleaned. it can be done at any stage, either fully assembled or everything stripped.

[@Crunch8111]

@@AlekseiGraciasFlor thanks!!

[@oscarlopez8804]

Hay whats up man. Cool vid quick question tho would it be basically the same thing for syncing the carbs on my 2002 gsxr 750???

[@seksei9374]

yup same theory, used it on my 400s too

[@cristinacastillo9639]

Good tutorial friend I am fixing the carburetor of my CBR mc22 and I would like you to help me. my question is how many turns is given to the air needle (rich mix) of the mc22. Thank you

[@shemes827]

2 & 1/2 turns out stock setting

[@cristinacastillo9639]

@@shemes827 hello, that's the same thing that I did, but I do not have anything, I pull the shock and if I let it go, it's like a drowned

[@firebladejass4026]

Yo tambien tengo el mismo problema con el carburador de mi cbr 250 mc22 ayuda por favor.

[@MrJakepascoe]

It depends on the model. The l+n model is only 1 3/4 turns out from closed

[@Thesachenshow]

Usually for 250 cc inline 4 engine it should be 2.5 turns if the pilot jet is sized 35.. Things will be different from bike to bike.. but this is a proper guideline

[@robbenalfans5501]

I wanted to ask about the carburetor balance is it normal to drop water in the another side,even if they are closed

[@seksei9374]

did you have you fuel- air screws out? if you did i reckon thats how your it leaked out, otherwise you may have wear, was t out of all the carburettors? or just some?

[@miro_yo]

Isn`t the water bad for the carbs?

[@seksei9374]

depends, as long as its cleaned properly after, ultrasonic cleaner use water based solutions. you can also dry out the water in a low temp/warm oven In the video i just demonstated with water, but i normal would use kerosene then spray carb cleaner after, i was just in an enclosed place so used water

[@jamesperrin5691]

Great thanks for post

[@pacharakinorn2917]

thanks for share

[@lamfitz4083]

BELIEVE YOU ME THIS TAKES TIME FOR A 1ST TIMER.... I'm currently working on a 93 honda cbr f2 .... I mistakenly unscrewed them all to unrust everything so I'm resorting to this..... I'll update once done and running

[@devone744]

Did u take out jets???

[@seksei9374]

You don’t have to, but you can, it doesn’t effect the bench sync

[@ledzeproberts2111]

Man I don't get that at all

[@mexicanamericansinthedenve6768]

What happened to you ??

[@seksei9374]

Still here, I'll try to post soon

[@Alex-td5qs]

Hi man ..I haven't been able to ride my motorcycle for a long time because the carburetors aren't set, if you give me a number of what's app to help me you'll be the coolest man ... I appreciate you.

[@laszlokatona3116]

😂

[@maciek600r]

Powietrze to nie woda nie oglupiaj ludzi

[@seksei9374]

fuel goes through too, not just air

[@JM-nh8yp]

Not so easy when on the engine.

[@seksei9374]

you dont want to do this while its on the engine, it can cause it to hydrolock, this method is called bench syncing, hence done on a bench off the egnine, if you are trying to sync it on the engine the best method would be to use a vacuum carburettor synchroniser, its quick and easy, but costs a bit for the tool, and its best not to cheap out of the tool

[@Ladosligese]

sry but .. a needle would be ALOT more accurate

[@LittleCBR]

A needle? How so

[@davidrobinson6019]

what a waste of time

[@sailingsilverwind]

?