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Old 11-03-2019, 11:34 PM
JOHN COOKSON JOHN COOKSON is offline
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Let's Start With The Easy Stuff

Could be a spark plug not firing or firing intermittently. Maybe the advance is sticky. Or maybe a combination of a sticky advance, a weak spark plug, and a fouled prop.
Sticky valve? Try a compression test.

Did you tune the engine when it started to lose power?

TRUE GRIT
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