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engine idle creeps up

  • Thread starter Thread starter 79GS850VETTER
  • Start date Start date
The carbs were just sync'd so it should not be that. However I did notice some oil that appeared to be seeping from the upper head gasket. (hard to tell for sure because the wind blows it around) I am wondering if air could be getting into the cylinder causing it to lean when the engine is hot.
 
got a 78 gs 750 with the exact same problem. New boots, orings, box rubbers, sealed ends of boxes, have been tweaking the air screws. No carb sync though. Sounds like we all have the same issue, interior orings and carb parts, carb sync neded- rebuild pending.:o
 
+1 on the petcock question.
My bike had a manual (not a vacuum) petcock installed and the (now useless) vacuum line that ran from the carb to the petcock was leaking. I ran the line back to the carb and plugged it onto a protuberance on the carb body and zapstrapped it there. This solved it for me.
 
nutsandbolts said:
got a 78 gs 750 with the exact same problem. New boots, orings, box rubbers, sealed ends of boxes, have been tweaking the air screws. No carb sync though. Sounds like we all have the same issue, interior orings and carb parts, carb sync neded- rebuild pending.:o
Click to expand...

My bikes idle will creep up to about 1700 once its hot after an extended ride. At idle when its just off the choke and warm enough to drive, its about 1100 to 1200.

As a side note, its been said that air leaks will cause it. What about if you are using the *FACTORY* hose clamps on the rubber boots. Mine sorta bottom out just as they are tightening up. Are there recomended replacements? Or just go buy radiator hose clamps?
 
New..

New..

Rick65Cat said:
My bikes idle will creep up to about 1700 once its hot after an extended ride. At idle when its just off the choke and warm enough to drive, its about 1100 to 1200.

As a side note, its been said that air leaks will cause it. What about if you are using the *FACTORY* hose clamps on the rubber boots. Mine sorta bottom out just as they are tightening up. Are there recomended replacements? Or just go buy radiator hose clamps?
Click to expand...

I bought new clamps, they are cheap, auto style are a little too wide..
 
I am using the factory clamps which do seem to be all bottomed out. I might order news ones if I can get them. I mean the bike is 32 years old after all. It would be worth knowing if the new box boots with old clamps could still be leaking.
One more thing to consider I guess those doing the same.
 
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