• 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 breather pipes

Agemax

Agemax

Forum Guru
what purpose do these actually serve, apart from the obvious? the pipes that come out between the carb bodies, one of which is the vacuum for the fuel tap.
my question is, if you had pods fitted, could these pipes be blocked off or best to leave them open to the atmosphere? will fuel leak from these pipes or are they there purely as a vent, to eliminate an air lock maybe?
 
One of them is NOT for the petcock. THAT one is on the other side of the carbs, on the outlet tube of either #2 or #3 carb, depending on whether you have BS or VM carbs.

The vent tubes, the Ts between 1&2, then 3&4, are there, as you supect, to prevent air lock in the float bowls. The recommendation that I have seen the most on this board is that if you have the stock airbox, leave the stock vent tubes connected to the Ts. If you are running pods, leave the Ts in place, but remove the hoses. I, for the life of me, can not figure out what difference that makes, but those who have done it say it makes a difference. Whatever you do, don't block them off.

.
 
Obviously you have to block up the vacuum tube if you're not running a vacuum tap. The other 2 tubes as Steve says are for venting in the carbs. I suppose you should really leave the hoses on as you could in theory get a fuel leak if your bowls overflowed but I've run many a bike with the hoses missing with no problems.

I also remember years ago buying a GS750 (I think - may have been a 550) where the PO had joined both vent tubes together using one hose. I didn't check for ages (too lazy :-\\\) and the bike ran fine so I think the vents are of dubious value.
 
hampshirehog said:
I also remember years ago buying a GS750 (I think - may have been a 550) where the PO had joined both vent tubes together using one hose. I didn't check for ages (too lazy :-\\\) and the bike ran fine so I think the vents are of dubious value.
Click to expand...
The po of my '79 850 had vents #2 and 4 connected to eachother as you describe. When I rebuilt, I vented both to air, per stock setup, but cyl 4 didn't fire untill i reconnected the 2 vents.:confused:
 
You must log in or register to reply here.
Back
Top