Idle fluctuating gs550e

[Guest]

Hi I've got my bike up and running after sorting out a few problems it had a hanging idle, this was fixed with a carb rebuild with all new orings, new inlet rubbers and oring. The engine now runs well but won't hold a idle don't get me wrong it doesn't fluctuate by a lot from about 1200 down to 1000 but sometimes lower to the point it cuts out. It goes up and down almost rhythmically maybe every 30 seconds. It also dips more when I pull up when riding. Any pointers in the right direction would be helpful. The bike is stock air filter it has a micron 4 into 1 exhaust.

[OldVet66]

Have you adjusted your valves and checked your float levels?

[mnferwerda]

I had some the same problems last year after cleaning the carbs and replacing o-rings.. I had to work with the idle mixture screw and the idle adjustment screw a bit to get it right. I had to back out the idle mixture screws and then adjust the idle as needed. It took me a few tries to get it right.

[Nessism]

Vacuum carb sync in addition to what's already mentioned.

[Krazyjuicedan]

Thanks for the replys, valve clearances are a little slack that's sort of the next upcoming job. I'll recheck the carb syncing and fiddle with the idle mixture screws this upcoming weekend. Thanks for the pointers

[chuck hahn]

I just went thru the normal idle and then it would jump up to around 3 grand and then settle back after a minute or so on my 77 KZ 650 project. This after a full dip and carb rebuild, new intake manifolds, carbs vacuum synced etc etc.

turned out the 1/4 coil was intermittently firing after it got hot...thus the fuel would build up in the cylinder unburned. When the coils would refire, the RPMs went gonzo. New coils took care of the problem. Lesson learned was to let it get hot and then use the timing light to see if the coil signal stay right or not.

Fouled plugs will also contribute to erradic spark and RPM symptoms.

[Krazyjuicedan]

Cheers for the heads up mate I'll get the timing light out as well at the weekend.