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Hello, My 1994 Yamaha Waverunner 3 will idle but wont take throttle. It overheated when I pulled sand into exhaust. After cleaning exhaust out I took it out and it ran fine for 2 hours, now it will run but will not take throttle. I have changed fuel lines, filter, rebuilt carb, rechecked rebuild, and still no change. Question: can the thermo switch have gone bad from overheat and be sending bad reading causing limiter to kick in. If so how can I check thermo unit to see if that is problem, It is an expensive part to change without being sure. Thanks, Don