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How to sync carbs on a motorcycle




This video demonstrates the procedure to synchronize a carburetor on a 1977 Honda CB550. It is really important, especially for bikes of this vintage, to synchronize your carbs at the beginning of every riding season or after any repair or adjustment to the carbs. This bike still needs some work to be road ready, but it has a lot of potential and is super cafe racer cool. If you are attempting to do this procedure yourself and have any questions before you start, feel free to let me know. That’s the good thing about Youtube, FREE INFORMATION FOR ALL!!!!! EDIT: Here are a few edits I would like to make to this video after watching it a couple of times. 1. Make sure your carb synch comes after everything else in a normal tune up. This includes Valve clearances, cam chain tension, spark plug gap/cleaning, point gap, ignition timing, air filter cleaning/replacement, and all the air bleed screw settings should be checked. 2. Engine speed for a carb synch should be around 1500rpms if possible. 3. The adjuster screw lockdown nuts should always be re-tightened after adjustment (I forgot to show it)
Video Rating: 4 / 5

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25 Responses to “How to sync carbs on a motorcycle”

  1. mrmaxstorey says:

    no problem

  2. Drifter215 says:

    Thank u max for all ur help

  3. mrmaxstorey says:

    I use 10w40 non-synthetic, because the fact that we have wet clutches makes the clutch a little slippy if I use synthetic

  4. Drifter215 says:

    Hey max what engine oil should i use when i change mine on my madura.i have the 700

  5. mrmaxstorey says:

    Well I couldn’t really tell you about that, it might be worth getting in touch with another owner and compare how hot his engine gets, but remember that will all depend on the ambient temperature, how long you let it sit there idling, etc

  6. SynthEnslaved says:

    I just tried using an ir thermometer to measure the temperature of the engine block while it was in idle. after about 15 min the temp was around 250 F on top and 200 F on the side. Im not sure how hot it’s allowed to get.

  7. mrmaxstorey says:

    Well if it is an air cooled engine, chances are it will overheat if you let it idle long enough. Especially the old engines, they need airflow to stay cool. Riding around town in stop and go traffic, and even sitting in a traffic jam is generally ok, but you dont want to let it idle for 20 mins while you go inside and look for something. Other than that, if the engine starts to overheat you wont really know until it starts seeping a little oil

  8. SynthEnslaved says:

    I have an 1100cc, straight 4. how do you tell if the engine is overheating while in idle?

  9. lilvasko1 says:

    Never seen a better video, very good bro. This Video Solved Excataly What I Was Trying To Find Out !

  10. darealpapac says:

    thanks bro i’m going to try it on my bike

  11. mrmaxstorey says:

    de nada, buena suerte

  12. 6Zorongos says:

    hola,,, gracias por compartir, un saludo

  13. mrmaxstorey says:

    Rearsets came from ebay I believe

  14. Dlogreen says:

    Dude, you just said Tallahassee…I’m from Tally, living in Jax now. Leon ’03! Quick question…..(again, sorry) Where’d you get those rear sets from on this 550…..and how’s the brake linkage working out. I need to go this route because I’m all crunched up on this bad boy when I get moving with the drag bars.

  15. mrmaxstorey says:

    Ebay always has them

  16. AparentleeAquaponic says:

    where should i start looking at getting a carb sinker tool? what features should i look for? thanks for the vid. great for learning something new about carbs.

  17. Nskawtea1 says:

    This is good stuff! Thanks!

  18. Mr8studnu2 says:

    well. I would have rather the carbs been out of sync to see and hear them being properly tuned.
    But instead they were already fairly close.
    Thanks for the info tho. Hell, I didnt even know such a gauge existed.

  19. chevcam92 says:

    I WAS ALSO TOLD, THAT IN THE PROCESS OF TUNING AT THE LOWEST RPM(IDLE TO 1500) THAT YOU SHOULD TRY TO GET THE HIGHEST VACUUM READING POSSIBLE ON EACH CARB.

  20. mrmaxstorey says:

    All you need to sync your carbs are featured in this video. Carb syncs are important because your valves, cylinders, rings, pistons etc wear at different rates, and subsequently have different compression readings. Therefore your bike will run the best if each individual carb is synchronized to its mating cylinder.

  21. supratje says:

    Ok I’ll check that too!
    Btw in general: When do you need to sync your carbs?
    Does this have to happen after x number of miles/years?
    And what’s the cause that they need to be synced?
    If you buy a new motorcycle for example it’s all good, but after some time you have to sync them… Why?

  22. wireham says:

    Awesome thank you

  23. mrmaxstorey says:

    Yes all 4 are hooked up at the same time. That is just a strategy for getting them all in line

  24. wireham says:

    Right but in the video you say to sync 1 to 2 then 3 to 4 then all flour together unless I misunderstood. That is where I’m curious if you have all four hooked up.

  25. mrmaxstorey says:

    Yeah a sync might help. Also check for vacuum leaks

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