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  1. #1
    Moderator beerdart's Avatar
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    Bing A Ding Brapp Brapp BOOM.

    What would cause a piston skirt to explode cracking the cylinder? Looks like a lower crankcase explosion
    I have never seen this before. Stock 1200R with ADA head 145 comp. It happened just after a no wake zone on throttle up. Odd


  2. #2
    Moderator beerdart's Avatar
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  3. #3
    WATER WOODY's Avatar
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    no pics

  4. #4
    Moderator beerdart's Avatar
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    Crap try this.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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  5. #5
    WATER WOODY's Avatar
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    call me

  6. #6
    Moderator OsideBill's Avatar
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    is it me??? or do those crank counter weights look misaligned? Crank seperation

  7. #7
    Moderator RX951's Avatar
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    with it being a cast piston, the piece that broke off looks like it jammed on the downstroke on that skirt and cracked it. It looks like a weak spot to cause that large of a piece to break off. When idling, the piston cooled off some (contracting) and it fractured. the piston will expand and contract some from normal operation. if an explosion is suspected, check those reeds

  8. #8
    Moderator beerdart's Avatar
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    Not sure if its the camera angle or not. The crank is going to be removed for a full inspection.

    Quote Originally Posted by OsideBill View Post
    is it me??? or do those crank counter weights look misaligned? Crank seperation

  9. #9
    All hail the Chief! fullboogie's Avatar
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    Quote Originally Posted by RX951 View Post
    with it being a cast piston, the piece that broke off looks like it jammed on the downstroke on that skirt and cracked it. It looks like a weak spot to cause that large of a piece to break off. When idling, the piston cooled off some (contracting) and it fractured. the piston will expand and contract some from normal operation. if an explosion is suspected, check those reeds
    Best answer so far. I've got $10 on this one.

  10. #10
    Eastside Powersports Slow 91's Avatar
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    Im really crossing my fingers that the crank is still good. its a brand new oem with low low hours on it. it would suck to have to buy a new one.

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