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Thread: piston wash

  1. #1
    The powder Man!! ashelgren's Avatar
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    piston wash

    Got a question about piston wash I seen the pics people posted and what it should look like. I just tuned my carb on a 96 xp did plug chops plugs look good browish color first three threds are blackish and my pistons look washed clean not much black at all it runs like a top and i'm tuned to factory specs on carb. I looks way rich looking at the pistons can this turn into a problem?


  2. #2
    race24x's Avatar
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    Better rich than lean. If you are not fouling plugs I dont think it would be a problem.

  3. #3
    96XPSS's Avatar
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    The only thing you look at when reading a spark plug is the porcelin. Chocolate brown. Threads, tips, whatever are irrelevant. New pistons take awhile to carbon up, so it they are new...that's why.

    If you are rich enough to wash a piston clean then your plugs will be black on the porcelin when doing a plug chop, and will probably foul them.

  4. #4
    The powder Man!! ashelgren's Avatar
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    I bought the ski used this summer and didn't look at the pistons until I tuned the carb I don't know to much about the ski. I bought it from a dealer and I only know the ski was from a older guy that was local and had it serviced every year at the dealer I bought it from. I guess I should have asked more questions when I bought it For me to know if factory setting are what I should be at I guess I would have to know if it's ever been bored out rejetted. Or just look at the plugs for the right color?

  5. #5
    96XPSS's Avatar
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    If it has stock pistons they will say "AUS" on the exhaust port side with an arrow, and the other side have "81.89" stamped on it. You may not be able to make it out from the carbon. If you don't see these numbers, there are generic pistons in there.

    Do a plug chop. That's all you really need to verify.

  6. #6
    The powder Man!! ashelgren's Avatar
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    Thanks guys

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