• 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 Leak-o-rama

  • Thread starter Thread starter Rocketman
  • Start date Start date
R

Rocketman

Guest
I know its been asked a zillion times, but please entertain me and my gas-soaked hands, and let me know why my carbs are leaking at the following three arrows. Little drips out the two brass screws at 4:00 and 8:00, and peeing out the black plastic nipple. Dropped bowl and float is NOT sticking. Thanks again guys. Larry.

 
The float may not be sticking but it sure ain't stopping the flow of gas from the fuel tank. Perhaps a piece of dirt is stuck between the needle and seat or the seat is deformed enough so it does not let the needle do it's job. Or perhaps the oring that seals the seat to the carb body is dust.
 
Since all 4 carbs were rebuilt last week with all new gaskets, o-rings & needles, how possible is that?
 
Are you hooking it up to gas while off the bike? If so, wouldn't it be natural for a bit of gas (enough for idling) to dribble out?
 
I think whether I'm on the bike or not, it shouldn't leak gas out of those areas at all. First I noticed it leaking with the air box connected, but couldn't see exactly where it was leaking from. Once I removed the airbox and ran it, it was obvious where the leak was coming from. The nipple is actually for fuel overflow, and I don't know what those two little brass recessed screws are for, but the other three carbs are dry as a bone.
 
What the heck are those 2 little brass recessed screws anyway? And why does it look like fuel is getting past them? Ok one of them is an air jet. Don't know about the other one. Also, what's the difference between the pilot jet and the main jet? Thanks carb-dudes.
 
Last edited:
I believe those are both air jets. I THINK the left one is the pilot air and the right one is the main air. It's leaking back through them because fuel is filling the bowl and not being shut off. If somebody rebuilt them, take it back.
 
The hole at 8:00 is the main air jet - it lets air into the main jet circuit to form an emulsion. The hole at 4:00 does the same thing for the pilot jet circuit. It seems clear that the float needle on that carb is not sealing which is allowing fuel to back up and run out through these air paths.

Sorry for the bad luck. At least you know what's happening now so you can attack the problem.
 
Thanks very much to both of you-for the info & the education. Carbs going back tomorrow.
 
also make sure the float height is set. that can determine if gas keeps coming out or not.
 
You must log in or register to reply here.
Back
Top