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High speed heating problem. Have changed water

High speed heating problem. Have changed water pump and thermostat and bypasses. Do we need to change Internal tubing? 1977 140 Johnson.

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Do you know the gauge is reliable thats telling you its too hot? 3 things to check: lean fuel mix, timing advanced too far, oil mixture too light. With the alcohol in todays fuel I would add more oil. In 1977 they had better fuel. Alcohol is a solvent, not a lubricant. The tubing may help minimally but the head passages are fixed. Good luck

Posted on Jun 25, 2009

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Posted on Jan 02, 2017

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