• 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 problems 82 gs650

  • Thread starter Thread starter frstsuzuki
  • Start date Start date
F

frstsuzuki

Guest
Hi all, well here goes, Origonal problem started with the bike only being able to be started with full choke and starting fluid. She wouldnt idle. Carbs were pulled, rebuilt, they are stock. Needle valve prelimanry setting 11/2 turns each, new boots and o rings installed. Float height set to spec, I believe all work done correctly. Thumb idle screw turned all the way down. Stock exhaust, stock air intake. All vacumn diaphramns looked good and tabs put back the way they came out.
Bike started on full choke, no starting fluid. Idled fine for just a short time then right back up to 6000 rpm. Check plunger on petcock, looks ok. Carb lines to gas tank are on the right way. What am I overlooking. Machine will not idle down. Any ideas ? Dumbfounded.:confused:
 
frstsuzuki said:
Hi all, well here goes, Origonal problem started with the bike only being able to be started with full choke and starting fluid. She wouldnt idle. Carbs were pulled, rebuilt, they are stock. Needle valve prelimanry setting 11/2 turns each, new boots and o rings installed. Float height set to spec, I believe all work done correctly. Thumb idle screw turned all the way down. Stock exhaust, stock air intake. All vacumn diaphramns looked good and tabs put back the way they came out.
Bike started on full choke, no starting fluid. Idled fine for just a short time then right back up to 6000 rpm. Check plunger on petcock, looks ok. Carb lines to gas tank are on the right way. What am I overlooking. Machine will not idle down. Any ideas ? Dumbfounded.:confused:
Click to expand...

Well assuming the throttle cable is on properly (don't laugh! I did this one time!) you may wanna look for a air leak. Sometimes the rubber intakes will become hard and no longer seal if they are disturbed.
 
throttle cable is on coreectly and I already replaced the boots and o rings.
thanks
 
frstsuzuki said:
Thumb idle screw turned all the way down.
Click to expand...

It sounds like an idle mixture/sync issue. I think you will need to hook up the mercury sticks to check/adjust sync and at the same time adjust your idle mixture.

Before you do this it may be worthwhile to try a "bench-sync". This just means to adjust the sync screws so that the throttles look even with the carbs off the bike. Use a piece of thin wire as a feeler gauge to help set the throttle openings evenly to start with. This usually gives a good enough sync to idle at 1500 RPM or so. You then use the mercury sticks to get the last bit of adjustment.
 
One thing you didn't mention...

One thing you didn't mention...

Is your air-box properly close and is your air filter properly oiled? You could have an air leak at the box if not properly 'closed', and I've read that the foam filter, if not oiled can act like an air leak....
 
Make sure a slide isn't sticking and you put the diaphragm slide springs back in properly.
 
One part of your statement is what I am suspecting:

frstsuzuki said:
Thumb idle screw turned all the way down.
Click to expand...


Just what do you mean by "turned all the way down"? It is likely that you have it turned too far. :oops:

Turn the screw counter-clockwise, watching the throttle linkage while you do this. Continue until the throttle stops moving. You might even feel a little less pressure on the knob, since it's no longer trying to hold the throttle open. Go back to where it feels like you are starting to move the throttle again, then go one more turn. Now try starting the bike, but only after you throw the starting fluid in the trash can. It is too easy to get carried away with that stuff and too easy to do damage with it. On a cold engine, use full choke and NO throttle. If the engine races, back off a bit on the choke. Eventually you will find the sweet spot on the choke to be able to start it and keep the rpm under 2000-2500 so you don't race an oil-starved engine.

When the engine is warmed up, try tweaking the idle mixture screws a bit. You might find that 2 to 2 1/2 turns will work better, but it should start OK with 1 1/2.



.
 
Recently had similar problem with GS650E 81. It started to stop feeding fuel to carbs unless tank fuller and fuller as time passed. As time passed more pressure had to be applied by a fuller tank. Diaphragm "looked" good to the mechanic but it actually proved to NOT to be good enough to do the job right. Decided to change the whole fuel petcock but most probably diaphragm only would have made it.
 
You must log in or register to reply here.
Back
Top