• Required reading for all forum users!!!

    Welcome!
    Register to access the full functionality of the GSResources forum. Until you register and activate your account you will not have full forum access, nor will you be able to post or reply to messages.

    A note to new registrants...
    All new forum registrations must be activated via email before you have full access to the forum.

    A Special Note about Email accounts!
    DO NOT SIGN UP USING hotmail, outlook, gmx, sbcglobal, att, bellsouth or email.com. They delete our forum signup emails.

    A note to old forum members...
    I receive numerous requests from people who can no longer log in because their accounts were deleted. As mentioned in the forum FAQ, user accounts are deleted if you haven't logged in for the past 6 months. If you can't log in, then create a new forum account. If you don't get an error message, then check your email account for an activation message. If you get a message stating that the email address is already in use, then your account still exists so follow the instructions in the forum FAQ for resetting your password.

    Have you forgotten your password or have a new email address? Then read the forum FAQ for details on how to reset it.

    Any email requests for "can't log in anymore" problems or "lost my password" problems will be deleted. Read the forum FAQ and follow the instructions there - that's what we have one for...

  • Returning Visitors

    If you are a returning visitor who never received your confirmation email, then odds are your email provider is blockinig emails from our server. The only thing that can be done to get around this is you will have to try creating another forum account using an email address from another domain.

    If you are a returning visitor to the forum and can't log in using your old forum name and password but used to be able to then chances are your account is deleted. Purges of the databases are done regularly. You will have to create a new forum account and you should be all set.

Carb Sync Procedure

  • Thread starter Thread starter aujax
  • Start date Start date
A

aujax

Guest
Hi,

I've got a '79 gs750e, running pretty well. It has the carbs with the plungers and no diaphragms. I have the sync guages with the needles (came with almost no instructions) and am ready to sync them. Anyone have a step-by-step set of instructions on how to do this properly so I don't miss anything? Are the 1 and 4 carbs supposed to be higher than the 2 and 3?

Thanks,
aujax
 
Do you have a service manual? There is usually a procedure in there.

Basically it's pretty easy. First remove the fuel tank and the top of your carbs. Attach in your intake port adaptors. Pinch off the vacuum line normally running to the petcock and rig up some sort of remote fuel tank - I use a chunk of 2.5" pvc pipe with a cap on one end, which has a threaded nipple attached. Pretty simple and cheap.

Hook up the gauges and start up the engine and let it run til warm, you should have a fan blowing on the engine. The adjusters are on top of the slides of your carbs. For early GS bikes without a crossover pipe in the exhaust, set the vacuum level equal for all carbs. Engine should be running at approx. 2500 rpm when doing the sync.

Very simple.

Hope this helps.
 
Hi Mr. aujax,

As I understand it, the vacuum levels are all the same if you have a true 4 into 2 exhaust (and VM carbs). If you have a 'crossover' or 'pre-muffler' between the 2 and 3 exhaust (and CV carbs) then the #2 and #3 carbs are set a little lower. It seems that right around 1980 is when Suzuki started using the exhaust crossovers and CV carbs. What does your manual say?

I have a manual for the 8-valve 750 on my website.

Mr. bwringer has a good carb sync guide on his website.

http://www.bwringer.com/gs/carbsync.html


Thank you for your indulgence,

BassCliff
 
carb sync

carb sync

thanks guys,

I synched the carbs, which was kind of a pain because the gauges i have (the ones with needles, not the mercury tubes) came with no instructions. How strong of a vacuum should I set them at? I decided on 10mm at idle since the engine over-revved if I went too high. It's a little baffling because the adjustment screws are turned way down so there's not much room left to increase the vacuum on them. There's a green section on the guages that says "normal". Is that where they should be at idle or at a certain rpm level?
even more annoying - my #3 carb is still not idling (the exhaust pipe is cold while the other 3 warm up at idle - it gets hot when i give it gas).

-aujax
 
You must log in or register to reply here.
Back
Top