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Old 05-08-2008
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beej67 beej67 is offline
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Also, I find these two statements a bit funny:

I took my boat out for the first time and it started running hot within 10 minutes of leaving the marina.
At the dock, I've had it running both at idle and in forward for >1hr with no overheating.
Can you elaborate on that? Sounds like there might be some clues in there. You ran the boat for an hour in forward, tied to the dock, and didn't overheat, but you ran the boat for ten minutes, in forward, while underway and it did overheat? I can't see how the load on the engine would be significantly different in those two cases. If anything, there'd be more resistance while you're tied up, as your boat tries to tow the dock.
beej67, Checkered Past, 1980 32' Pearson 323, Panama City FL
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