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  1. #1

    Join Date
    Dec 2006
    Location
    Richmond, Va
    Posts
    162

    900 sts piston melt down

    Ive got a 2002 900 sts that i lost compression in the middle cylinder. A little history on the ski. The owner rode the ski and said the over heat warning was going off. He brought it to me and the exhaust coupler had burned up, so i replaced that. I blew threw all the cooling lines and then i took it to the river to test it. I ran it wot for about 200 yards and shut it down. The exhaust was so hot you couldnt touch it, but the over heat light never came on. I idled back to the ramp and steam was coming out of the pisser. Well i dug a little deeper and found a rock stuck in the main cooling line coming from the pump.
    I took the ski back out and was cooling fine. So the owner takes it out the following weekend and said it kept droping rpms and finally couldnt get on plane.
    I checked the compression when i fixed the over heat problem and it was fine. The piston and cylinder are very black with a burnt oil film on them and the piston is melted away on the exhaust side. The other thing i noticed is that the c clip is missing out of one side of the piston. The other 2 pistons look fine. Would over heating cause just the middle piston to do this?
    thanks
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  2. #2

    Join Date
    Dec 2006
    Location
    Richmond, Va
    Posts
    162
    Few more pics
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