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What is the cause of a vibration at a specific RPM

L

Luc Vinet

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" I have a Merc 25 Hp. The eng

" I have a Merc 25 Hp. The engine runs smootly at almost the entire range of RPM. There is one point betwheen half speed and 3/4 of the top speed that i feel a vibration. As soon as that speed is past , no more vibration. Top speed is perfect. Is this normal ?? The propeller is not damage.

Thanks.

Luc "
 
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