My 2000 F50T has developed a miss above 2700rpm. Smooth as can be till then, but try to move throttle past 2700 and miss occurs. Can't seem to isolate by disconnecting any plug wire. WOT yields 4500rpm. I've been through the carbs and replaced the spark plugs. It has been suggested to disconnect the temp sensor on the head to see if that is the problem. Does that ring a bell with anybody? Any input will be appreciated.