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Water not making completely through the heads to exhaust

Hello, My 130hp yamaha 2-stoke motor heat sensor went off while running today, water pump working great pissing but not exiting the heads to the exhaust, Pull thermostats to see if working. no problenm there. What area could be blocked? All was working well two months ago.
Thanks Clif

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Heads could be clogged with corrosionor sand.

Posted on Oct 12, 2010

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