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  1. #1

    1999 Yamaha XL 1200 LTD Cavatating

    Can anyone please help me troubleshoot my XL 1200
    Recently replaced my impeller and housing and still cavatating out of hole
    RPM shoots up to 7000-9000 until ski planes before it gets any speed
    This is really crawling under my skin since ski performs and top end speed is normal
    Any help solving this aggrevating mystery would be greatly appreciated


  2. #2
    silver93t's Avatar
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    Everything sealed together properly? I like to use silicone betwren the pump hpusing and hull, the nozzle, intakevgrate, and ride plate. Not a whole lot just enough to fill any voids. Do you have a pump seal kit? Check clearance between impeller and wear ring?

  3. #3
    Yes, used silicone between transom and impeller housing.
    Ride plate was not removed so that rules that out.
    Clearance between impeller and wear is good.
    The only thing I didn't do is apply silicone to the intake grate did not think it would be necessary but you may be on to something because when I removed the pump there was this piece of black stuff just kind of hanging down from the intake grate that I pulled off looked like part of a seal.
    Would love to think this might just possibly be that easy of a fix.

  4. #4
    silver93t's Avatar
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    Sounds like you need a pump seal kit. There is one piece t
    If i recall correctly that needs to get reused so if its missing you wi have to either get a replacement or fill the void with 4200 ir something.

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