vibration at 900 rpm

fatcatone549

Member
Jun 1, 2011
70
Brick,nj
Boat Info
1999 express 21.5
Engines
5.0
Hi I took the boat out every thing good, on the ride back got a vibration at 900 rpm above that or below runs smooth. any ideas 357 merch
 
is the engine noticeably running rough at 900 rpm?.....if not you likely have a small bend in a prop blade.....

cliff
 
when is the last time the engine was tuned up?

cliff
 

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