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25 HP Yamaha low on power
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<blockquote data-quote="turbotodd" data-source="post: 422862" data-attributes="member: 7376"><p>If it's got spark on both cylinders, the coil is ok-usually. Failed coils on Yamahas are pretty rare in my experience.</p><p>Single carb, so that rules out one carb being plugged.</p><p>Could be a reed valve issue. Or air leak. Could be air leak at the lower crank seal. I ain't been into one of those in a while but some had a plate that is bolted to the block which retains the seal-and if an object was struck hard enough, the plate could break, then causing air leak-showing up as a lean lower cylinder. Check the engine compression.</p></blockquote><p></p>
[QUOTE="turbotodd, post: 422862, member: 7376"] If it's got spark on both cylinders, the coil is ok-usually. Failed coils on Yamahas are pretty rare in my experience. Single carb, so that rules out one carb being plugged. Could be a reed valve issue. Or air leak. Could be air leak at the lower crank seal. I ain't been into one of those in a while but some had a plate that is bolted to the block which retains the seal-and if an object was struck hard enough, the plate could break, then causing air leak-showing up as a lean lower cylinder. Check the engine compression. [/QUOTE]
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25 HP Yamaha low on power
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