Hard in reverse? Hit something?
I hit a log last Labor Day and it pulled my shaft from the coupler (and bent the prop). I got it back together and ran it the rest of the season, but it was never the same again. That's supposed to be a shrink fit with ZERO play - ideally the set screws arent doing anything. That brass (or whatever it is) coupler is pretty easy to deform - a little runout is going to allow the shaft to wear an increasingly bigger hole in there..
I installed a new ARE Shaft system from skidim this spring, and not only does it not try to come apart every time I'm out, but it's balanced as sooth as can be now! The double taper design of the ARE system is really light-years ahead of how they made them in the 80's!
Korey Morris -
Sold to Arkansas: 1986 Supra Saltare
Current: 2018 Moomba Craz