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I have a 2008 Kawasaki ZZR600 with 6,050 miles. It's mostly stock except for a Yoshi slip on.
It's having this habit of a wandering idle when it's warmed up. When I'm sitting at a stop sign or stop light the idle will raise to around 3000RPM and stay there. Also if I rev the engine it doesn't immediately drop back to idle like it should, it slowly goes back down the rev range until it gets to idle. Trouble is it revs fine throughout the range while riding.
I've had two ideas for the problem. One person said the jetting is off because of the slip on exhaust can (running too lean on stock jets), the other suggestion was something to do with the butterfly valves sticking.
Anyone here have different suggestions/ideas? Thanks