Maintenance & Technical > KX500 Original

The Next Rebirth!

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dirtball:
What sort of problems does the sheered flywheel key usually end up creating?

dirtball:
How far does the flywheel seat onto the crankshaft?  I have to lap the flywheel to the crank, where it spun, it moved some metal around.   Does the flat area at the end of the taper hole on the flywheel end up flush with the flat face at the base of the threads on the end of the crank?  It doesn't seem that the flywheel is going all they way to the seated postion.  I have the cases apart and the crank on the bench.  The rod bearing is within spec, I am trying
to avoid having to buy a new crank assembly.

Dirtball

John:
If you follow Cam's instruction you'll be fine.

The limitation of how far you can insert the flywheel is caused by the conical shape of the crank. If you were to grind using valve grinding compound you will be fine. Just make sure that the both contact-surfaces bares marks of the grinding and then a bit more. When you reached that stage, you know that the flywheel will be properly and tightly seated.

I hope this makes sense to you?

//John

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