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  1. #1

    99 GP1200 piston melt down

    So my ski was running great for a few years until it melted the 2 end pistons. I bored the cylinder and rebuilt the carbs thinking all was well, but after an hour, it killed the same pistons. The middle piston is fine. I don't have pics, but it looks like other pistons posted here for similar situations. I pre-mix the oil BTW and it's stock except for Boysen reeds and Riva filters. Any ideas??? This is getting old, I just want to ride. Thanks in advance.

  2. #2

    Join Date
    Sep 2013
    Bennettsville, SC
    Carburetor troubles. ...leak check cases.

  3. #3
    Myself's Avatar
    Join Date
    May 2007
    North Central Arkansas
    Must be air leakage from somewhere causing it to run lean on the ends, dried up crank seals? Warped exhaust manifold or intake?

  4. #4
    Thanks for the replies and messages. How do I leak check the crankcase seals? The lower end was rebuilt at some point. In another post from someone else with a similar problem mentioned something about a fuel return mod. I've had 3 of these things since 1998 and this is a first for me. Usually they have melted from cooling system issues. Again, thanks for the help in advance.

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