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  1. #1
    qbzonk's Avatar
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    '97 XP piston damage

    My buddy's ski has been running horrible for years. It is hard to start ALL THE TIME. It runs OK on top sometimes and is just basically been no fun because of all of it's problems.

    He finally got fed up and removed the domes. He noticed there was pitting on the exhaust side of the rear piston and dome.

    He wants to fix, but isn't sure of his options. He's looking into a top end rebuild and possibly going up on the bores.

    Here are some pics, sorry for the quality, they are from my camera phone.

    Any recommendations?
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  2. #2
    Mpeavler's Avatar
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    Looks like Detno from low grade gas? Is the ski stock...?

    Hows O town...I sure do miss it.. =0(

  3. #3
    qbzonk's Avatar
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    Ski is bone stock. We looked into:

    - top end swaps with SBT $475
    - new head from RIVA $230
    - piston sets $225-ish
    - new sleeves????
    not sure which route to go as of yet.

    O-Town is SOSDD.

  4. #4
    Mpeavler's Avatar
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    It looks like bad gas to me...

    Piston wash looks ok....

    M

  5. #5
    How is compression? Cylinder walls? Head is still okay. May just need a new piston with rings, C-clip, wrist pin, bearings and top end gasket set.

  6. #6
    qbzonk's Avatar
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    Cylinder walls are scratched up. He didn't check compression but he hasn't done anything to the motor in the five years he has owned it. He's put a few hundred hours on it over the years.

  7. #7
    Former 2 stroke hater!
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    Looks to me that you got a lean condition. It could be the carb on that cylinder running lean causing the detention that got the piston. Some scratches in the cylinder are OK to run, remember that all the compression happens in the top 1/4th of the cylinder (above the ports) so some minor scratches down the hole won't really hurt to run it like that. If it were my ski, I would just get another piston/rings and put it back together (as long as there are no bad scratches in the cylinder especially the top) with new gaskets. Be sure to hone out any aluminum deposits left on the cylinder walls by the piston, it only takes a light honing to clean it out.

  8. #8
    qbzonk's Avatar
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    Can the sleeves be overbored? We saw piston kits that offered 0.5 - 1.5mm overbore.

  9. #9
    Former 2 stroke hater!
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    yes, I believe up to 80 thou..

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