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  1. #1

    2001 GP1200R, loud knocking noise, lost compression

    I was out riding my ski, when all of the sudden, I accelerated, and heard a loud knocking noise. I immediately idled back to the dock, and pulled the ski out of the water. Checked compression, and I am reading 80-100-100, from front to back. Where do I begin? Can someone please point me in the right direction to repair my ski? Thanks. I am guessing I have a rod banging or something, and probably damaged the cylinder? I know how to pull the head, and do everything on the fuel system, carbs, etc.. but have never worked on the block before. Any help would be appreciated. Thanks.

    James


  2. #2
    powerstroke specialist mikegp's Avatar
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    pulling the head is the first step. from there you will be able to see how bad the damage is.

  3. #3
    I will pull head tomorrow and post pictures

  4. #4
    Predator-x's Avatar
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    Before you pull the head check the couplers on the back of the engine ,if the are good you can start by pulling the head.
    If a rod bearing or crank bearing failed you won´t be able to see by pulling the head ,you can check if the cylinders/pistons are not scored.
    When they look good you have to remove the cylinders one at the time by disconnecting the coupler from the powervalves and unbolt the
    cylinders.
    Now you can feel if the rods have no bearing play, if they all feel good you have to take the whole engine apart ,you probably have a failed crank bearing.
    But take it one step at the time and post pics when you removed the head.

  5. #5
    Predator-x's Avatar
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    James.
    Did you already made a attempt to locate the noise ?

  6. #6
    Not yet. Just got back in town. Will start today.

  7. #7
    Predator-x's Avatar
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    Good luck, keep us posted .

  8. #8
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    Quote Originally Posted by Predator-x View Post
    Good luck, keep us posted .
    I took the head off. Dont see any signs of damage. What should I be looking for now?

  9. #9
    Polarisitis loonatik's Avatar
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    Why are all pics taken with piston at bottom? Did you manually turn the crank to get them down?

  10. #10
    Predator-x's Avatar
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    I hope that it looks like all three pistons are on the same lowest point ,if they are than you have a serious problem.

    Pictures are not very clear ,looks like rust on the left piston ,you don´t see any dubris on top of the pistons ?
    Can you take a picture from the bottom of the head too ?

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