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  1. #1
    Darthraider's Avatar
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    Lite weight piston pins

    Has anyone run wiseco piston pins in Yamaha or Pro-x pistons.

    I have used them for years in wiseco pistons without any problems, but the others have less support for the pin on the bottom side of the piston.
    Or any costom ones that fit non pv motors


  2. #2
    Old Ski Insanity w/rpm500's Avatar
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    ???

    Ok this may be a dumb question... Is support as critical on the bottom? I'm thinking compresion is pushing down , the top tales the load.. I know that the piston pressureizes the case on down stroke, but the top load area is where I would think MORE beef needs to be . I read some where here that some one used the old 650 pins that were less heavy than the other's???? Dose YAMI use the same width/diam.pin in all engines???
    Last edited by w/rpm500; 02-02-2007 at 12:57 PM.

  3. #3
    Darthraider's Avatar
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    I use the 61x pins now. I agree on the load zone your talking about, But plan to run the dog .... out of this triple piped baby.

    I think the added support keeps a thin walled pin round under load.
    Last edited by Darthraider; 02-02-2007 at 01:37 PM.

  4. #4
    Old Ski Insanity w/rpm500's Avatar
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    check these guys out ,may be the ticket..http://www.stealth-engineering.com/a...sWristPins.htm

  5. #5
    My son (mohawk man) jeffsntx's Avatar
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    Those pins can NOT be used with needle roller bearings!!!
    Last edited by jeffsntx; 02-02-2007 at 03:34 PM.

  6. #6
    Darthraider's Avatar
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    Great site, but they can't be used with needle bearings.
    I Appreciate the help, whe have a good team here....

  7. #7
    Old Ski Insanity w/rpm500's Avatar
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    I saw that also...hope'd they'd make em with a wear sleeve for the rod end bearings

  8. #8
    My son (mohawk man) jeffsntx's Avatar
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    If you put a busing in the rod end it would not get enough lubrication and sieze. This is the reason for the needle roller bearings.

  9. #9
    Old Ski Insanity w/rpm500's Avatar
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    Yes Yami uses the needle's in a full float .. I'm wondering if a sleeve COULD be pressed OVER a titanium pin... you would the loose weight, retain strength and get the wear area for needles.

  10. #10
    My son (mohawk man) jeffsntx's Avatar
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    Then you would have the task of finding larger needle bearings and having the rod end machined to accept the larger OD needle bearing.

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