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Thread: GIO built fzr

  1. #71

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    Quote Originally Posted by Leendert View Post
    25 - 35 % loss on all cylinders with a leak down test.
    only cylinder 1 had an accurate test because the exhaust valves always seem to leak on these engines.
    Any one else experiece that?
    I had the same thing with leaking exhaust valves. I found this out when trying to install the riva valve train upgrade. I struggled to pressurize the cylinder. Once the new heavy duty valve springs were installed the cylinder held the pressure.

  2. #72
    yol937's Avatar
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    I also had that problem when I first put valve springs in my boat My compression was down with the stock motor and rd valve springs. The valve jobs on these skis aren't that great from the factory always some leakage. It would hurt to def lap the valves in if u havnt already done so

  3. #73
    Leendert's Avatar
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    Quote Originally Posted by yol937 View Post
    I also had that problem when I first put valve springs in my boat My compression was down with the stock motor and rd valve springs. The valve jobs on these skis aren't that great from the factory always some leakage. It would hurt to def lap the valves in if u havnt already done so
    I did a 5 point on the valves when I first built the motor.
    But somehow the exhaust valves always leak on these motors.

  4. #74

    wavy cylinders?

    Quote Originally Posted by Jmfmk3 View Post
    Your entire rpm range is great and your still getting GIO? Maybe wavy cylinders?
    - what's that?


  5. #75
    what can cause this wavy cylinder problem? at 10 hrs of 2019 svho ski? riva stg 3?

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