Ever since I hit a log going full speed there has been a cavitation or slipage problem with my 2006 25 hp Yamaha 2 cyl. As I fish the river the motor was not locked down just in case I did hit something, etc. The motor kicked up and reved up really high before I could get it shut down. Now at full speed there is a cavitation or some kind of slipping problem. It's like the prop loses it's grip and motor wants to rev up slightly. It's worse in slight chop but still have the problem on smooth water. Back off throttle slightly and the problem goes away.

Replaced the prop.with OEM 9 x 9 7/8 but problem still exist. Now using 9 x 11 prop and it's not as bad because the RPM's are reduced a bit. Prop when accident happened was a rebuilt. The 9 x 11 is also a rebuild. Could the hub be slipping just a tad at speed?

One mechanic advised it could be the rev limiter was damaged. This is a little over $300 plus labor. No way to know for sure without replacing but if that is not the problem I don't think the part can be returned.

I'm trying to minimize my repair cost as the bux are a bit tight. Any ideas on how to solve this problem?