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Yamaha P45 water pump problem

B

Bob Hunter

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" I have an old 2HP Yamaha P45

" I have an old 2HP Yamaha P45. Starts and runs just fine. But if I open up the throttle too far water STOPS coming from the exhaust, and the engine overheats. If I then set it at tickover for ten seconds there is a small cloud of steam, water starts coming out exhaust again, and everything is fine once more. I have replaced the impellor (twice).Checked everything I can think of(not much to check). I bought it secondhand. No manual. Am I missing something? Is the engine missing something? Previous owner was a tinkerer but no mechanic. "
 
"Bob,

You probably have a l


"Bob,

You probably have a leaky gasket. It could be the head gasket, exhaust gasket, or the powerhead base gasket.

Another possibility is that the cooling system has an obstruction somewhere which is interfering with circulation.

"
 
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