PDA

View Full Version : 1992 Yamaha 2 cyl 2 stroke 40 HP MDL- C40ELRQ


DAB
04-09-2006, 04:19 PM
To set the stage for the question I was runing at full throttle, with everything purring like a kitten and all of a sudden the motor reved up like it was cavitating ( the water was as smooth as glass ) I pulled it back into Neut. motor resonded correctly, put back into forward and gave it the gas and it started out like it should then all of a sudden it reved up again like it was cavitating, put it back in neut and it responded corectly. Both times there was no other noise or vibration or anything other than it reved up as if it were cavitating this is the only time it has ever done this. There was a dock neer by so put it in forward with a little throttle and made it to the dock, tied up, turnd the motor off, tilted it up to see if I could see if there was anything obviously wrong and could not see a thing wrong. I droped it back into the water started it up and was going to go back and load up and go home but decided to see if it would do it again so headed back up stream punched it and not another problem at all, put about 10 more miles on it running full throttle and it never missed a beat ( not even a hint of reving up like it was cavitating ) for those ten miles. All the controll cables are working as they should.
to put it one way it was like a clutch was slipping bad at certian RPMs.
Anyone have a thought of what happened???????????????
DAB

damoperator
04-09-2006, 06:08 PM
You might look at your prop it may be slipping on its hub. [the rubber shock absourber in the prop] Damoperator

DAB
04-10-2006, 11:12 AM
You were correct, Got a prop on order thanks for the reply.
DAB