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  1. #1

    GP1200 Possible Impeller Issue

    Good Morning, I have two 1997 Yamaha GP1200s. My ski takes of slow but once at top speed runs like a scalded dog. However sometimes at high speed the impeller sounds like it is slipping, the engine revs high but there is no thrust. After I let off the throttle and the ski settles in the water I have to ease on the throttle back to top speed before the same problem occurs again. I think I am getting cavitation but am not sure. Any suggestions? When it does feel like the impeller is slipping there is a weird sound almost like ball bearings being shaken in a can, a metal rattle if you will. Any help would be much appreciated.

  2. #2
    silver93t's Avatar
    Join Date
    Jun 2012
    Whats the clearance to the wear ring?

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