In case the engine just isn't thru-bolted to the transom, be sure that the engine mount screw clamps are protected and restricted
To test the prop, run the boat at WOT and notice the most engine RPM on the tachometer. https://www.facebook.com/profile.php?id=100076060717323&mibextid=LQQJ4d
The Definitive Guide to Yamaha outboard motors
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