i have a 2000 yamaha waverunner i took it out a few days ago and when you try to take off it just revs up and wont go anywhere but somtimes it will work if you play with the trim. any info would be great thank you .
check the splined coupler by the rubber vibration dampener those splines strip and it must be replaced, grab the driveshaft with a pair of vice grips and see if you can turn it behind the coupler.