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  1. #1

    wiseco pistons 951

    i have heard wiseco has changed the alloy in their pistons and are saying .004 is enough clearance on .020 over pistons, i was running .008 clearance on old wiseco's with no problems, is .004 to tight for wiseco's


  2. #2
    2000 GPRXP 4tec shooter98xpl's Avatar
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    unless you plan on doing a 5 minute warm up everytime you start that motor, then YES (I believe you meant .040, but if it is .004 then damn that is super tight). I ran .065 clearance on my wisecos, but I know Bill O'neil had recommended .080 to .090
    SHOOTER

  3. #3
    Water Bum Rodneyae's Avatar
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    Not Sure.... I just bought a set for my polaris 780 tripple project. They told me the .004 was the clearance needed but I did have the machine shop bore them to .007 I like beeing on the loose side of things, Just in case.

  4. #4
    96XPSS's Avatar
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    Shooter you are thinking about spark plug gaps...he he

    If you are running a pipe then I'd set them up at .007". I agree .004" is too tight. Make sure they mic from the piston skirt too, as two-stroke pistons taper. The machine shop guys normally mic accross the pin area. Many a piston has been squeaked from micing the wrong area.

  5. #5

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    Yea I wouldn't go with .004" clearance, .007" is better and I would still warm the boat up for a few minutes every time before hammering on it.

    Dan

  6. #6
    2000 GPRXP 4tec shooter98xpl's Avatar
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    he understood what I meant.
    SHOOTER

  7. #7
    96XPSS's Avatar
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    Quote Originally Posted by shooter98xpl View Post
    he understood what I meant.
    SHOOTER
    We did too...


  8. #8
    2000 GPRXP 4tec shooter98xpl's Avatar
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    thats all that counts man

  9. #9
    Thank's for that guy's, anyone comfirm that wiseco has changed the alloy in their piston.

  10. #10
    96XPSS's Avatar
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    Quote Originally Posted by bluesonic View Post
    Thank's for that guy's, anyone comfirm that wiseco has changed the alloy in their piston.
    Not me. I would have bought Pro-X pistons.

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