• 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.

idle problems

  • Thread starter Thread starter thrashin88
  • Start date Start date
T

thrashin88

Guest
hey everybody, heres a little background. i got a 1980 gs 750 for $100.00 from a friend that was chopped into a hardtail but never finished so i got it in parts. the airbox wouldnt fit anymore so i used a dynojet kit to rejet the carbs for pod filters and the bike finally runs and drives good with full power through all the gears. the question i have is this... basically the idle seems to fluctuate a bit. for example, today i started it and got it warmed up and the idle seemed to be solid and i went and drove it for about 10 minutes and when i pulled back into the driveway i stopped and for about 10 seconds the idle stayed nice and low (about 800-1000) and then it slowly started revving up to maybe 1500-1800. it seems to do this alot. also if it starts idling low and i turn in the idle screw a tiny bit sometimes it will do the same thing and start revving up. i refit the boots to stop any potential leaks and it seemed to help but its still not perfect. i also synched the carbs at the same time i did the boots but i did it with a kinda ghetto homemade carb sync so its still not perfect but its better than it was. could a legit carb sync fix this or should it be something else? thanks, i could use ideas.

also just for fun... on the front of the engine theres a spot where it seems to be leaking a little bit of oil out of the head gasket right in the middle where that little bolt is. is this a problem? i know its an old bike so if its not a big deal im not worried about it, i just wanna drive the thing. also the pipes i have are 4 into 2 and the pipe for the right 2 cylinders has oily residue in it. should i be really concerned or is it normal for a bike this old to burn some oil. thanks again, you folks are lifesavers
 
thrashin88 said:
hey everybody, heres a little background. i got a 1980 gs 750 for $100.00 from a friend that was chopped into a hardtail but never finished so i got it in parts. the airbox wouldnt fit anymore so i used a dynojet kit to rejet the carbs for pod filters and the bike finally runs and drives good with full power through all the gears. the question i have is this... basically the idle seems to fluctuate a bit. for example, today i started it and got it warmed up and the idle seemed to be solid and i went and drove it for about 10 minutes and when i pulled back into the driveway i stopped and for about 10 seconds the idle stayed nice and low (about 800-1000) and then it slowly started revving up to maybe 1500-1800. it seems to do this alot. also if it starts idling low and i turn in the idle screw a tiny bit sometimes it will do the same thing and start revving up. i refit the boots to stop any potential leaks and it seemed to help but its still not perfect. i also synched the carbs at the same time i did the boots but i did it with a kinda ghetto homemade carb sync so its still not perfect but its better than it was. could a legit carb sync fix this or should it be something else? thanks, i could use ideas.

also just for fun... on the front of the engine theres a spot where it seems to be leaking a little bit of oil out of the head gasket right in the middle where that little bolt is. is this a problem? i know its an old bike so if its not a big deal im not worried about it, i just wanna drive the thing. also the pipes i have are 4 into 2 and the pipe for the right 2 cylinders has oily residue in it. should i be really concerned or is it normal for a bike this old to burn some oil. thanks again, you folks are lifesavers
Click to expand...

if you didnt rebuild the carbs before you got the bike running I would do so. check float levels as well.

Go here for a picture walk threw
http://members.dslextreme.com/users/bikecliff/

Then get intakeboot o-rings(the likely solution to your problem) along with a carb o-ring kit as well. you have CV carbs also known as BS carbs

http://cycleorings.com/

Good luck

Jake
 
the bike i have doesnt have intake o-rings, they are just rubber boots that clamp the carbs on one end to the engine on another, its a 1980 thing i think. and those look really new, they arent dry, cracked, or worn in any way but i still think its possible they still might not be getting as quite good of a seal as i want. is there some kind of sealant that i could put around the inside of the boots to make sure im getting a good seal? cause somewhere along the line it seems to have a leak unless theres something im not thinking of

as far as the float levels go... could that affect the idle fluctuating? as i understand it that shouldnt affect it but im no expert by any means?

also could a legitimate carb sync possibly help this. i just used a homemade 2 carb sync device to sync all the carbs to number 3. (1 to3, 2 to 3, and 3 to 4)
 
as far as the float levels go... could that affect the idle fluctuating? as i understand it that shouldnt affect it but im no expert by any means?
Click to expand...

The float level/ fuel height will have an effect on all the jets of the carburetor.

Sounds to me like you have some air leaks. Take a can of carb cleaner and spray your intake and exhaust boots. Listen for changes in the idle. The carb boots have a right and left, they must be oriented correctly for everything to seal. If they are old they should be replaced.

The vacuum sync will effect the way the carburetors perform. Sync the carburetors correctly. If you don't have the right tool, either borrow one or pay someone to do it for you.
 
You must log in or register to reply here.
Back
Top