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I just bought a 94 WaveRunner III. It runs like a scalded ape (that's good) for the first 20 minutes or so then it starts to hesitate and sputter. I think that it is overheating and some sort of rev limiter is kicking in. What do you think. How do I check to see if water is pumping well and getting to the engine. I would appreciate any help. Thanks in advance.
 

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Are your cylinder head and exhaust cool still? Slightly warm? Sounds like the temp sensor on top of the cylinder head. Happened to me on a Tigershark, same symptoms. If in doubt, pull a couple hoses off and see if water is coming through when running.
 
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