i have two yamaha's
both 500's
waverunner and wavejammer
they both seem to run great
the jammer runs good and is smooth
the waverunner runs very good too
but has a vibration
the more gas i give it the worst it is
i replaced all the bearings in the drive train
i think three
it still vibrates like crazy
can the motor itself have a problem with weights or balancing
i was going to swap motors just to see if it is at this point