• 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.

Understanding carb (VM26) leak issue on GS750L

  • Thread starter Thread starter skobovm
  • Start date Start date
S

skobovm

Guest
Hi all,

I was wondering if anyone could help me understand whether my garage having a puddle of gasoline is caused by my screw-up (will get to it in a moment) or if I need to take apart and re-clean my carbs/get new parts.

The good news: I cleaned my carbs, replaced valve shims, replaced intake o-rings, adjusted points gap, and got this project bike running!
The bad news: The bike didn't run all that well and I made several mistakes along the way including:
- Running the bike without the petcock vacuum tube (or plug). Didn't realize what it was. I'm guessing this is the reason that the bike started idling slowly and then slowly increased RPMs (without touching throttle)
- Didn't dip the carbs or take off the mounting frame
- Left the bike in PRI overnight

More details:
- The floats were adjusted and were bouncy and "happy" feeling
- I did not take the floats off or remove the float valve (because I'm terrified of breaking the posts)
- Only carb #3 leaked. 1, 2, and 4 had no indication of a leak (the overflow tubes weren't installed, so I know where the puddles would be).
- The carb leak appeared to be coming out of the drain, however it's hard to say for sure

So here's my question: Is leaving the tank in PRI the root cause of this issue, or is there something else wrong? Since the fuel goes into carb 2 and 3 first, maybe it just comes out of one those first? Are the float valves supposed to stop fuel 100% or just 99% and hope that the engine can suck the gas fast enough?

Thanks!
 
Yes, the fuel needle should stop the flow of fuel

Now, go back and clean your carbs correctly, and review the Top 10 Newbie mistakes
 
I figured that would be the response I got :)

Well, hopefully a thorough cleaning, dip and disassembly will fix everything up!
 
Maybe not, but you can remove carbs from the list of possible problems

Have you read the VM tutorial?
 
Yep, read through it a few times -- very thorough. Unfortunately I got the bike from someone who paid someone else to just barely get the bike running. It has a new petcock, new jets (allegedly), but was backfiring so hard I felt like I was on a rocket. That may have been because the pilot fuel screw was turned out 2.5 turns (which seems super high, compared to the recommended ~1 turn starting point). But I'm not sure if that was just to compensate for the 4-1 exhaust that's on it, instead of rejetting. I was able to get it to idle nicely with the screws out to the punch mark (1.25 turns-ish) but maybe I'm making it run too lean? Will have to do the spark plug check once the leak is gone.

That said, this is exactly what I signed up for, and really enjoy doing the work and getting my hands dirty. Glad I chose a bike with such a supportive community and plethora of resources.
 
Last edited:
You must log in or register to reply here.
Back
Top