The site sponsor can get you a WSM crank, there is also SBT for a crank, or you can go to the dealer and get an OEM reman crank. Personally I always go the OEM route for the extra cash. What happened to the current engine?
last year some youth turned the seadoo over and then ran it for a short time. I belive this led to my trouble. I have the rotary shaft gear chewed up and when I tore down the engine I found one jug with a cracked water jacket to the outside and the piston scuffed up below the rings even though I had 150 psi compression. My crank has about 3 bearings that feel rough when turning them like they have some flat spots.