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  1. #1

    How long should you get out of an engine?

    Hello fellow jetskiers,
    I have a 98 GP 1200 which i just had rebuilt about 20hrs ago.
    The reison for the rebuild was the engine had a overheating prob.

    1,

    talking to a few ppl about the yamaha engines,
    I was told that the pre power valve engine needs to be rebuilt every 150hrs or so

    Any input on this??

    2,

    I here there is a mod to the barrel which helps with the piston problem,

    Does anyone know of this mod and what is involve?

    3,

    I just brought a 05 GPR1300
    does this ski have the same engine problems ?

    Any input would be gratefull


  2. #2
    WE DONT DIAL 911 RDH's Avatar
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    there really is no set time limit on when to rebuild motors.. its all about who owns it and how well they take care of it...

    your 1300r isnt the same as your 97 gp...

    luckily your new ski doesnt have powervalves, so no need to worry about that problem..

    im not sure of any barrel mods to help the piston,,, i do know you can have the pistons "windowed".. also theres a special coating that can be applied.

  3. #3
    JacRae's Avatar
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    I have heard its a good idea to have the cylinders bored with the exhaust manifold installed to prevent the bores from distorting from the manifolds weight/stress on the cylinder.

  4. #4
    DAGO RACING CREW 97GPSLEEPER's Avatar
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    Quote Originally Posted by goin4bn View Post
    Hello fellow jetskiers,
    I have a 98 GP 1200 which i just had rebuilt about 20hrs ago.
    The reison for the rebuild was the engine had a overheating prob.

    1,

    talking to a few ppl about the yamaha engines,
    I was told that the pre power valve engine needs to be rebuilt every 150hrs or so

    Any input on this?? No!! A greedy mechanic must have told u this, I have 175 hours on my Group K ported motor, compression is still good.

    2,

    I here there is a mod to the barrel which helps with the piston problem,

    Does anyone know of this mod and what is involve? Never heard of a inherit piston problem on these motors

    3,

    I just brought a 05 GPR1300
    does this ski have the same engine problems ? The 05 1300 motor is a good motor & there are not any power valves needing clips to prevent them from dropping in the cylinder.

    Any input would be gratefull
    ...

  5. #5
    thanks guys,
    For all your help and input.

    The reison im asking is that i know of 3 GP1200 that have done pistons.
    and all of them have broken the top lip above the top ring on the exhaust side of the piston. and all the motors seam to go around the 100 to 130hrs

    Talking to a few people around and i have being told that the yamaha 1200 and the 1300 engines all have the same problems.

    this will be the 3rd time i have rebuilt this engine and the damage on the piston was allways in the same spot ( on the exhaust side ) of the piston.

    The last rebuild, i had it board out to 10tho over and i thought that it would stop the piston picking up on the port.

    Rob

  6. #6
    Hydrotoys's Avatar
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    Power valves have hit the piston.

  7. #7
    Ya Boy Trevor bajaeater's Avatar
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    i think you just have a problem and you havent fixed it so everytime you put it back together it does it again. like if you was lean and kept it lean even after the rebuild. is it possible something is hitting ur piston on ur exhaust side?

  8. #8
    WE DONT DIAL 911 RDH's Avatar
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    Last edited by RDH; 04-04-2008 at 12:42 PM.

  9. #9
    MPower's Avatar
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    rebuild at 200 hours IMO

  10. #10
    old school big raider's Avatar
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    no powervalves on 65u motor- probably caused by detonation-is failure on #3 cylinder?

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