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  1. #1

    SL 750 blown piston D***!!!

    Hello everyone,
    Found the reason my ski felt like it was in limp home mode. I havea small hole in the front piston.

    Does anyone know which, or how I could determine which piston I would need? Not sure what the .010 .25 measurements are for.

    I have the top of the jug off, and I'm going to start pulling the jug and exhaust out tonight.

    I'm pretty sure this happend from running to lean. How can I adjust this also?

    Any help here would be appreciate, thanks in advance.

    John

    3A:
    SET,PISTON,.010/.25MM O/S

    3688650-001 3D:
    SET,PISTON,.020/.50MM O/S



  2. #2
    100 MILES OF HEAVEN AND I AM SMACK IN THE MIDDLE KEYZBUM's Avatar
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    WELCOME TO THE FORUM
    you need to check ,
    fuel lines (including ones in tank)
    on-off-res fuel selector switch
    jets in carbs
    tiny filters in carbs
    others will help with the stuff i forgot
    mattman

  3. #3
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    A hole in the piston is usually from a lean running condition. Ski Bum hit the big problem areas, but forgot about the fuel pump. You can rebuild the old one, or upgrade to a new triple outlet for about $25.

    The .25 .50 .75 refers to metric over sized pistons. A basic rule of thumb is .25mm is 10 thousandths, .5mm is 20 thousandths, etc..

    If the cylinder is still good, you can prob replace with the same sized piston. If it's damaged, then the machine shop should be able to tell you what size piston you'll need if they have to bore it oversized.

  4. #4

    Piston Size??/

    Is there any way I can determine the size of the piston I need when I pull the old one out. I'm sure you can, but how?

    I bought these used, and I'm not sure if the jugs were honed out larger or what.

    I will certainly start going through the fuel system. That's for sure! Where can I get those rebuild kits?


    Also,
    On my sl750, I have two clear tubes in my hull. They seem to be this 8th inch size. I found where one went, it went to the mfd under the shaft.

    The other, I have no clue. I think it runs to the front of the ski to a vent, but not sure. Where exactly does this hose connect in the fuel system? Or does it?? Could this tube be unconnected have caused me to blow a hole in on of my pistons?

    Thanks,
    John
    Last edited by armyguy7776; 07-02-2008 at 02:28 PM.

  5. #5
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Answered these Q's in another thread you asked about.

    What's the numbers written on the piston tops? A pic will help greatly.

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