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  1. #1

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    GP1200R Engine blow

    Hello,

    What do you think happened here?



















    The cylinder was nikasil replated and the piston was brand new. After ten hours this happened.

    Thanks


  2. #2

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    Why was piston replaced and cylinder re-nikasiled ten running hours ago?

  3. #3
    Yamaha Mechanic TunedFX140's Avatar
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    i am gonna go out on a limb here and say powervalve failure

  4. #4

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    looks like the rod broke at the small end, probably breaking up the piston too, and the rod jammed itself repeatedly into the bore and piston until the engine stopped, sending pieces of piston, rod, and bearing through the side of the case.

    Is there a piston anywhere?

  5. #5

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    Quote Originally Posted by toyterrific View Post
    Why was piston replaced and cylinder re-nikasiled ten running hours ago?
    The fuel line of that cylinder failed (the sphere of the one way valve got stuck) and the piston got "glued" to the bore. The cylinder had some small scratches and was repaired.

  6. #6

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    Quote Originally Posted by TunedFX140 View Post
    i am gonna go out on a limb here and say powervalve failure
    I had the WaveEater Powervalve Kit installed.

    I'm thinking about the piston bearing. Can it's failure be a justification for this?

  7. #7

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    Quote Originally Posted by sleeper_dave View Post
    Is there a piston anywhere?
    The piston was broken in a lot of small pieces...

  8. #8
    Happily Self-Employed WFO's Avatar
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    was it a WSM piston?

  9. #9

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    Quote Originally Posted by WFO View Post
    was it a WSM piston?
    ProX, like the other two that were replaced at the same time.

  10. #10
    TX21's Avatar
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    So you just replaced the piston and didnt clean out the crankcase? I think you had some metal in the lower end if so and the crank let go because of it.

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