Why is my 2008 Suzuki GS500F idling high?

M

Me My

New member
Sorry, the details of this are a bit long. I started this project because I had backfiring through one of the carbs (it's a dual carb motor) and issues with the idle slow to return at a stop. With the high idle, if I slowly released the clutch while stopped, the idle would come back down and stay down. My first fix was re-shimming an exhaust valve which is now within specifications. After that I moved to synchronizing the carbs. At first this was a challenge because the idle was everywhere and the gauges fluctuated everywhere. Then, out of nowhere, the idle jumps to 5000 and stays there. If I put it in gear and hold the brake, as if I were stopped, the idle comes down, but jumps back up as soon as the clutch is pressed. The good thing here is that the idle is consistent enough at 5000 that I could synchronize the carbs. The bad is that I now have synched carbs and a 5k idle. I have adjusted the idle nob at the bottom, it is not even touching. The throttle cables have free play so they aren't the issue. I am confuzzled. Any ideas would be great. Thanks
 
Sounds like air is getting in between the carbs and the intake. Perhaps the blowback has blown out part of the gasket. The carbs can not be set correctly until the problem is found and fixed.
 
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