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Carb idle questions, need advice!

  • Thread starter Thread starter JimminyCricket
  • Start date Start date
J

JimminyCricket

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My '82 gs650g has been off the road for 2 years, here's what I've done so far before cranking her up.

- Valve shim adjustments - all within spec, cylinder 4 intake and exhaust slightly loose; new cam cover gasket

- Drained and replaced oil and final drive oil and replaced filters

- Drained gas, removed & cleaned petcock (all ok, no rust or crud)
-Cleaned carbs and replaced o rings and gaskets per the Carb Cleaning series. Bench synched them.
-Replaced intake boot o - rings and all fuel and vacuum hoses
-Torqued all bolts on the bike to Clymer manual recommendations.
-New throttle, choke, clutch cable
-Cleaned and reoiled Uni foam air filter

Bike has stock exhaust and airbox, jetting is all standard, low idle/air screws are set at 1 1/2 turns right now.

Bike starts right up, once warm the idle slowly climbs to about 1700 - 1900 rpm. If I blip the throttle, it drops down to where I have it set, about 1100, but then climbs back up to the 1700 range. I haven't synched the carbs yet, could this be the cause? My plan for the weekend was to synch as best as I can with the funny idle speed, reset the low idle screws for max idle, and then resynch. Is this a good plan to get this bike back on the road before summer is gone.:cry: Anything else any of you gurus might be able to think of that I should check to solve the idle issue?

Haven't checked compression yet, but before it was stored compression was good and other than the idle, she sounds great. Will check this over the weekend as well.

Thanks for any pointers you all can offer.

JimminyCricket
 
Do the new choke and throttle cables have a little slack in them? Sounds like one of them is hanging up.
 
JimminyCricket said:
My '82 gs650g has been off the road for 2 years, here's what I've done so far before cranking her up.

- Valve shim adjustments - all within spec, cylinder 4 intake and exhaust slightly loose; new cam cover gasket

- Drained and replaced oil and final drive oil and replaced filters

- Drained gas, removed & cleaned petcock (all ok, no rust or crud)
-Cleaned carbs and replaced o rings and gaskets per the Carb Cleaning series. Bench synched them.
-Replaced intake boot o - rings and all fuel and vacuum hoses
-Torqued all bolts on the bike to Clymer manual recommendations.
-New throttle, choke, clutch cable
-Cleaned and reoiled Uni foam air filter

Bike has stock exhaust and airbox, jetting is all standard, low idle/air screws are set at 1 1/2 turns right now.

Bike starts right up, once warm the idle slowly climbs to about 1700 - 1900 rpm. If I blip the throttle, it drops down to where I have it set, about 1100, but then climbs back up to the 1700 range. I haven't synched the carbs yet, could this be the cause? My plan for the weekend was to synch as best as I can with the funny idle speed, reset the low idle screws for max idle, and then resynch. Is this a good plan to get this bike back on the road before summer is gone.:cry: Anything else any of you gurus might be able to think of that I should check to solve the idle issue?

Haven't checked compression yet, but before it was stored compression was good and other than the idle, she sounds great. Will check this over the weekend as well.

Thanks for any pointers you all can offer.

JimminyCricket
Click to expand...
Did you replace the boots also?Are they on the carbs good and clamps snugged down not crancked down?I would guess an intake leak,but lets see what everybody else says.These would be things to look at though.
 
Last edited:
Take a can of brakekleen or WD and spray the intake boots with the engine running. Any change in engine speed indicates they're sucking in air which will present the symptoms your describing. Do this outside:-)
 
Oh. And you can't vacuum synch with an intake leak or adjust the mixture screws. Waste of time.
 
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