Over the past year have noticed the the revs are slower to return to idle when the throttle is snapped closed. New problems this week...low to mid range throttle is fine but it cuts out when I open it up and once warmed up, the motor is idling way too high and not affected by the idle adjustor screw. The mechanic told me to pull off the top of the carb and check the diaphragm for a hole or a tear. Did that only to find that this carb has no diaphragm. Guess I need to find a mechanic that knows a little more about Mikuni carbs. Anyone have any ideas? Carb appears to be getting enough gas and the air cleaner is clean.