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  1. #1
    Cashito's Avatar
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    2007 GP1300R Way Down On Power

    I have a 2007 gpr with 171hours. It has a dplate, free flow exhaust and ejk, rest is stock. I dewinterized it and it's running oddly. It sounds sad, very low exhaust note with terrible acceleration and 49mph top speed. Just has lost its pep.

    2 of the spark plugs looked blac rich, one was perfect. There was black oil or fuel around the base of the two blackened plugs. I replaced all three with no change. I tried removing the EJK which made it worse. My plan was to run injector cleaner and check compression. Is there anything else to try?

    Thank you


  2. #2
    African-American
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    Compression check all 3 cylinders.

    Check the stock oil injection is not stuck 100% open or blocked

    Remove all old fuel and use new fuel with injector cleaner.

  3. #3
    Cashito's Avatar
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    Quote Originally Posted by spaceman View Post
    Compression check all 3 cylinders.

    Check the stock oil injection is not stuck 100% open or blocked

    Remove all old fuel and use new fuel with injector cleaner.
    Gotcha. Not sure how to check oil injection system. Any advice?

  4. #4
    African-American
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    I premix.
    I do know it can be stuck 100% open if there is too much slack or a broken cable. Then it runs super rough. However compression test first, ring might be dying and before you destroy the motor/cylinders it's a very cheap fix.

  5. #5
    Cashito's Avatar
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    115 psi cylinders 1,2
    0 psi cylinder 3

  6. #6
    kpietro's Avatar
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    Quote Originally Posted by Cashito View Post
    115 psi cylinders 1,2
    0 psi cylinder 3
    That's not good... You have a hole in your piston. You will probably want to go with a whole new top end. That piston and cylinder are both shot.

    Next is is to pull the motor apart and assess the damage that has been done.

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