Maintenance & Technical > KX250 / KX125

Crankshaft side play

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stewart:
the counter wieghts should be center in case with same distance on both sides ..when cases are pressed toghter and the crank does not  turn freely  with it centered then the counter wight s were not held apart  properly during the pressing together  of the cases try putting somthing between them oppiste  the rod pin and pushing them apart till the crank spins freely

BDI:
when you press the cases together the inner bearing races wined up pushed appart from eachother causing the bearings to bind up. If you press the crank to one side and then back to center it automaticly spaces the center races on the crank the same distance appart as the outer races in the case, thus centering the balls in the bearing races and allowing the bearing to spin free. As for crank to case side clearance it is what it is once the crank is centered in the cases, 1.2 mm sounds typical. If you are concerned with your crank being pressed together wrong you can check the rod to counter weight clearance with a fealer gauge. Your clymer should give this spec but I wouldn't be surprised if hot rod thought that the stock spec was excessive and tightened it up some, You may want to call them and ask what they think. I do know that if it is to tight the big end rod bearing may over heat from not getting enough cooling gas and oil.

    P.S. all of this should be done with a crank installation tool in place to keep from knocking the crank out of true.

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