• 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.

New member, carb jetting

  • Thread starter Thread starter Mark Crystal
  • Start date Start date
M

Mark Crystal

Guest
Hello all,

Had a couple questions. I bought this bike (my first) 1977 gs 750 I'm learning more an more as I read. I bought it for 350$ didn't run. I replaced points and gapped correctly. It has pod air filters and I'm unsure if they put a jetting kit on it. Got it running, cleaned the carbs. #3 cylinder exhaust is cooler then all the rest. And where does the vacuum to the petcock go? #3carb? Currently not connected. Won't go over 55 just bogs. What should the jets on the bottom be set at? 1 full turn? And I have the top air jets set at 1and a quarter. Any help would be greatly appreciated.
 
First of all,
welcome2.gif



You will need to verify that you have main jets that are a bit larger than stock, if you wish to retain your pods. I believe the stock main jets were 100s, you will want something in the vicinity of 110, but that is just a guess.

Having the pilot fuel screw (the one on the bottom) turned out one full turn is probably a good place to start. As a rule, you start with the air screws (the ones on the side) double the fuel screw setting, then adjust from there.

HOWEVER, you will probably be doing yourself a BIG favor if you do a proper freshening up of the carbs with a full "strip and dip" cleaning and replacing all the o-rings with a kit from cycleorings.com. You should also plan on changing the intake boot o-rings and the lousy screws that hold the boots to the head. The good news is that ALL of the o-rings and the replacement stainless bolts are less than $25. Do NOT get any carb rebuild kits. The parts in them are usually of inferior quality, and don't even contain everything that you will need to clean and rebuild the carbs. Your current brass pieces (all the jets) should clean up just fine, ready for re-use.

Our official greeter, BassCliff might be along shortly with his full "Welcome Package", but he usually notices new members quicker if you do an introduction in the GS Owners forum.

.
 
Vacuum to the petcock goes on carb #3.

Using an aftermarket petcock without the vacuum switch.

I synced the carbs the realized i had left it open, After re-attaching this is what the gauges showed:
9P8DG2gl.jpg


And then corrected:
6KRXpF6l.jpg


This would definitely be why #3 pipe isn't hot.
 
Thanks for the speedy reply. I have yet to make a manometer like the one in the photo. I have all the parts just need to put it together. Ill try what you suggested and see what happens. Thanks so much!
 
You must log in or register to reply here.
Back
Top