i have a 1994 750 st jet ski you have to throttle the bike slowly to take off if you dont it just revs and will not plane out any suggestions thanks

 

Same with my 650TS. It sort of accelerated but with out good acceleration. I though it was sort of cavating, but impeller was ok. Then it could catch and just go normally up on a plane.

I cleaned the reeds (See my picture on this forum), added new fuel, new plugs.

Something I did fixed it, as it accelerates and holds top speed again.