Question for motor expert.

[Plumbobber]

I have a 2001 Yamaha 250 OX66 with 170hrs. I hit a rock with the prop and bent the prop shaft. Had a new shaft put in,gears were fine. The motor shakes a little bit at idle speed(it started when I hit the rock) up to about 10rmp, didn't before. What would cause this, bent driveshaft?

[LuckyLady]

Either the prop is tweaked or the drive shaft is bent or its possible that something is not shimmed right gear wise. Not sure if that would cause it to shake but it is a possibilty tons of pieces in the lowers.

[Questsportfishing]

so they pulled your lower unit and replaced the shaft??.. we need a little more info on whats been done. you can bend a crank shaft to a rod or waller out a wrist pin by hitting things..

[Plumbobber]

so they pulled your lower unit and replaced the shaft??.. we need a little more info on whats been done. you can bend a crank shaft to a rod or waller out a wrist pin by hitting things..

Yes, replaced the prop shaft. Not sure if the lower unit was pulled. Do you have to pull the lower unit for this? I do know they checked the gears and they were fine. They changed the gear oil also.

[Plumbobber]

Either the prop is tweaked or the drive shaft is bent or its possible that something is not shimmed right gear wise. Not sure if that would cause it to shake but it is a possibilty tons of pieces in the lowers.

New prop installed also. I'm thinking driveshaft!

[Avenger]

If you hit something that hard it's possible that you damaged a motor mount. Just a thought.