• 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.

Overflowing carbs, '79 GS1000 (for btgs1000)

  • Thread starter Thread starter BassCliff
  • Start date Start date
B

BassCliff

Guest
Hi,

Since I'm no expert in VM carbs, I'm sharing this PM I received today so that you experts can help Bryan. He just re-joined the forum but can't post yet. (Don't worry. Frank will get around to it in a day or two.) ;)

btgs1000 said:
Hi BassCliff. Sorry to bother you in PM. My name's Bryan. I'm not new to the forum but haven't been here in awhile since I sold my old GS1000. I now have another I'm working on. It's a 79 GS1000 with the 80 style vacuum petcock with no shut off. I cleaned and rebuilt the carbs (VM26s I believe) and since my petcock is probably caked with varnish and won't flow, I ran another tank with a free flowing petcock on it just to try to get the bike started. In doing so, all the carbs overflowed immediately before I could get it started. Then I noticed I forgot to plug off the vacuum line. Would that cause them to overflow out the drain tubes on the bottom? The other suspect is that one of the brass overflow tubes in one of the carb bowls was nearly broken off. I wasn't sure if they could operate that way or am I going to need a new carb for that one?
Thanks,
Bryan
Click to expand...

My response: said:
Hi,

I'm not as well-versed with the VM carbs as others on the forum. But an unplugged vacuum line would not cause all of the carbs to overflow. It would cause a big vacuum leak and run lousy.

If I were to guess, it could be that the floats are stuck, or at the wrong height, or the float valves are not working properly.

If you don't mind I'll post this in the carb section of the forum so you can get some real expert responses. ;)

All the best,

Cliff
Click to expand...


Thank you for your indulgence,

BassCliff
 
the broken off overflow tube will definately leak fuel, the only remedy is a new or used float bowl. i had a broken tube as well a few months back and a GSR member came to my rescue.
 
There are a couple of issues going on here:
First, even the "dreaded '80 petcock" has a vacuum shut-off.
None of the other GS petcocks have a manual shut-off, they are ALL vacuum operated.

Second, It appears that the bike might not have been running for a while, because some of the fuel parts are "varnished over". That could also be the case with the inlet valves.
It is also possible that the floats are stuck or not adjusted properly, but the inlet valves are good candidates here.

Third, Plugging the vacuum line on the carbs will do NOTHING to prevent overflowing due to any other problem, including stuck inlet valves.

Fourth, if the overflow tubes are broken off inside the float bowl, the new "overflow" height is the height of whatever is left in there.
If the tube is short, it will basically free-flow, trying to raise the fuel level above the height of that tube.

Fifth, how sure are you that it's a '79 bike with an '80 petcock? Be aware that the '80 models were produced as early as August or September of '79,
so please do not think that the assembly date is the model year of the bike.

.
 
Just to follow up with results. I was referring to the wrong piece on the carbs. The piece that was broken was the choke tube on the carb base. The reason it was overflowing was because of a weak float valve spring. I replaced all the float valves and seats with new ones from Z1 Enterprises and the bike started and ran well. Thanks.
 
Hi,

btgs1000 said:
Just to follow up with results. I was referring to the wrong piece on the carbs. The piece that was broken was the choke tube on the carb base. The reason it was overflowing was because of a weak float valve spring. I replaced all the float valves and seats with new ones from Z1 Enterprises and the bike started and ran well. Thanks.
Click to expand...

Well, congratulations! You get to tell us about a success with your very first post. And now, you know what's coming. ;)

It's the "mega-welcome"! Bwwaaahaaahaaahaa!
hand-01.gif



If you are here you probably have a 30 year old motorcycle that needs about 20 years worth of maintenance. You'll find all kinds of helpful tips, procedures, manuals, diagrams, "how-to" guides, etc, in the links below. Let's get started.

Let me dump a TON of information on you and share some GS lovin'. :D

I just stopped by to welcome you to the forum in my own, special way.
big_hi.gif


If there's anything you'd like to know about the Suzuki GS model bikes, and most others actually, you've come to the right place. There's a lot of knowledge and experience here in the community. Come on in and let me say "HOoooowwwDY!"....
hat1.gif


Here is your very own magical, mystical, mythical, mind-expanding "mega-welcome". Please take notice of the "Top 10 Common Issues", "Top 15 Tips For GS Happiness", the Carb Cleanup Series, and the Stator Papers. All of these tasks must be addressed in order to have a safe, reliable machine. This is what NOT to do: Top 10 Newbie Mistakes. Now let me roll out the welcome mat for you...

carpet.jpg


Please Click Here For Your Mega-Welcome, chock full of tips, suggestions, links to vendors, and other information. Then feel free to visit my little BikeCliff website where I've been collecting the wisdom of this generous community. Don't forget, we like pictures! Not you, your bike! :D

Thanks for joining us. Keep us informed.

Thank you for your indulgence,

BassCliff
 
You must log in or register to reply here.
Back
Top