Home Forums General Karting Discussion Iame leopard bad crank and crank case question?

This topic contains 4 replies, has 4 voices, and was last updated by  baruch fishman 1 year ago.

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    baruch fishman

    Hi Guys,

    Take a look at these pics and explain if you can how can this happen?

    i realized that i bent the crank somehow someway so i decided to open the motor and see what is going on and i found this:

    i am just very curious on what could cause this to the crank case and crank itself .







    Greg Wright

    It doesn’t take a lot of twist in the crank assy for it to rub the cases.

    Greg Wright
    Rapid Racing Inc.

    "When in doubt Gas it, It won't help but it ends the suspense."


    Walt Gifford

    The shaft has to seat on the bearings. You might need some bearing shims. Crank should have at least .025″ wall clearance.


    FAA certified jet engine and aircraft technician,
    Nicholson Speedway class champion 2001,
    Yamaha KT100 Service Center,
    41 years karting experience



    Crank shaft may have become lose, or someone lost kart at a corner and spun backwards, and while going backwards kept pushing the throttle, instead of waiting till fully stopped.

    Or someone simply just accidentally dropped the engine, and landed on the shaft bending it, knocked it out of trueness or round.


    baruch fishman

    Thanks for the input !

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