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, 1 month ago.

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  • #55384

    baruch fishman
    Participant

    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 .

    http://prntscr.com/8qy2vm

    http://prntscr.com/8qy36u

    http://prntscr.com/8qy3c2

     

    Thanks

    #55403

    Greg Wright
    Participant

    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."

    #55486

    Walt Gifford
    Participant

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

    Gif

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

    #55510

    FREDDY SANDOVAL
    Participant

    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.

    #55696

    baruch fishman
    Participant

    Thanks for the input !

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