If there is 250 hours on it and it started to run rich the last 50 hours....then the question is what changed. Kawasaki has a tech hot line (at least they used to) for all the dealers to use. The hot line is for dealers and the dealer number must be provided before being connected to a technician. If your dealer has not called the hot line ask them to do so - better yet ask to be included on the call with them. If this is a common problem as another poster has stated they should have a ready fix. At one time engine ran fine - it should not need a work around at idle.
However, if you desire to fix it yourself I would offer several ideas for consideration.
1) The fixed resistor can fix the rich idle as you have demostrated. however it will stay in the system and affect the entire fuel curve. If you add a switch which is activated only when the throttle is at idle the resistor bias can be removed as the throttle is advanced away from idle.
2) In a simliar manner you could consider adding a parallel air path by drilling a small hole in the throttle butterfly. This would result in the throttle butterfly being more closed to maintain the same idle speed. The TPS would call for less fuel and the small hole would become insignificant as the throttle is advanced from idle.
3) Using similar reasoning as in 2) try adjusting the TPS to a more closed position. If this works...then why does the throttle position have to be more open to maintain idle speed then perhaps it was 50 hours ago. Has the timing become retarded...?
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