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  1. #1

    burnt piston... =(


    i want to order a piston, i also forgot the size i have, i think i have a .25mm oversize... is that correct? next oversize from standard piston?


  2. #2
    Click avatar for tech links/info, donation request K447's Avatar
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    Can you accurately measure the cylinder bore diameter?

    Or the piston.

  3. #3
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    That is bazaar. The damage stretches from the center to the boost port.

    Normally that happens at the exh port.

    You've definately got an issue going on there.

    Guess we found the reason for your low compression on the PTO.

    .25 would be the first oversize piston from stock, but you should check the bore to be sure.

    Was there any damge to the cyl?

    How does the other cyls look? Might be time for a top end rebuild.

  4. #4
    im lucky the bore is still ok xlint... yes we found the low compression, my mag and cent is ok... what could cause this? could it be reeds?

  5. #5
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    That is really weird that the majority of the damage is on that side of the piston.

    No, reeds won't do that.

    The edge of the piston is eroded. Pretty sure that was from blow by getting past the rings.

    The center of the piston starting to hole usually indiactes a lean condition or too much timing. (excessive heat inside the combustion chamber)

    Possible air leak, misadjusted carb, crank out of phase, clogged fuel filter, or low fuel pressure.


    Bad reeds would cause backfiring and an over rich condition. (flooding)

  6. #6
    could be the rings stick first and cause blow by and so the piston starts to melt, and the melt goes thru the blowby area, last time i have a sticked needle valves on my carbs which i already fixed it... i forced it last time running on the beach, even the needle valves won't open, this could be the cause... i won't suspect for timing, crank out of phase, and clogged fuel filter..

  7. #7
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Stuck closed needle valve could do it.

    Check the index just to be sure.

    Also do a leak down test while you're at it.

  8. #8
    Pain is fear leaving your body.... rlovebk's Avatar
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    Bummer Andy. My SLT has been down all year. Luckily other 5 ski's running good. But my Polaris is my first love. (Ski love guy's, ski)
    That is an odd scorch mark. Have not seen that one before.

  9. #9

  10. #10
    Click avatar for tech links/info, donation request K447's Avatar
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    Wash pattern looks lean to me. Almost all black, no thumbnail sized clean areas near the ports.

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