• 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 Hoses

  • Thread starter Thread starter Poot
  • Start date Start date
P

Poot

Guest
Hi all,


Just a quick question here...


on the carbs of my 1980 850, there are some hoses I'm replacing. I'm not sure yet, what the length/diameter of hose I need yet is, (phoning dealer tommorow) but more importantly, am not too sure where some hoses go.


I know where the thick and thin fuel lines go, but am wondering where the hoses going on the plastic "T" s inbetween carbs 1-2 and 3-4 would go.

they are the fuel vent lines, but I dont know if they link together, or just dangle into thin air(i.e. venting)?


[pooot]
 
They just...dangle.

On my GS850, they go up and over the airbox and dangle somewhere behind it. You want the open ends to be somewhere where they're not going to get a lot of air rushing past. You wouldn't want any weird effects from a partial vacuum on the vent hoses.

I think you also want them to loop up from the carbs before ending with the ends pointed down. That way, water or gas can't accumulate and block off the hose like a a sink trap.

To be honest, I'm not entirely sure exactly what effect this would have, but I'm sure it wouldn't be good.
 
Yeah, those tubes vent air at atmospheric pressure to the bowls so that there is a pressure difference between the bowls and the venturi, which in turn motivates the gas to enter the airstream by way of the various jets.

A fun experiment, if you feel like getting intimate with your GS, is to blow into them. Just make sure the engine side is facing you or gas will get all over you. I did it one day to verify that the tubes did, in fact, do what I thought they did.

In theory, any pressure effect on these tubes will affect mixture. Higher pressure will "push" the gas in the bowls out, richening the mix; lower pressure will "draw" the gas back, leaning the mix.

On my GS, they run over the airbox and kind of hang out in the dead space above the tranny but below the battery. This spot is pretty much ideal, because there is not a lot of airflow and not a lot of heat. Either one could throw off the pressure.
 
if i dont have luck at the dealership, do you guys know what the diameter of the various hoses are????


thanks
 
Not off hand, but I'll be happy to measure. Mine are from a GS1100GK, they're 38's I think.
 
You must log in or register to reply here.
Back
Top