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