Help! Engine Seizing, Evinrude 9.5 Twin

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Posted by Greg ( on August 30, 2005 at 17:24:37:

Can anyone dirrect me as to what I need to repair. I just purchased a 9.5 Sport Twin Evinrude Model 9722M (1967?).

At low idle the engine runs smooth. But after several minutes of high speed, operation the motor slows. Last week end it ran great at high speed but then slowed and stopped. After an hour of allowing it to cool, it started back up and ran excellent.

Do I have a water pump issue or possibly a thermostate, or both? I am at a loss!

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