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Old boat motor question

Big G

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poorbiker Enthusiast

poorbiker

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I have a 1972 100HP Johnson motor. It starts right up and runs excellent until you start going about 3/4" throttle, then the motor will start missing and hesitating. Any ideas would cause this. Had the carbs tuned and new plugs put in, but still has the problem.

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poorbiker Enthusiast

poorbiker

Posted
Posted

I have a 1972 100HP Johnson motor. It starts right up and runs excellent until you start going about 3/4" throttle, then the motor will start missing and hesitating. Any ideas would cause this. Had the carbs tuned and new plugs put in, but still has the problem.

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