Maintenance & Technical > KX250 / KX125

Main Bearing Repacement

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traileater:
Holy crap that is so simple! You just saved me a few $$. Thanks!

BDI:
When heating the cases in the oven use the spit method. as soon as they are hot enough to sizzle spit they are good to drop the bearings in. If the cases are not hot enough the bearing will get stuck and you have to press it out and start over. If the cases are to hot you run the risk of hurting the bearings temper with heat, not good. You can also heat the inner race of the main bearing and then drop the crank right in. You have to cool the crank in the freezer of cours. I have a speical aluminum plug that fits in the main bearing. you heat the plug and then set it in the bearing. when the inner race gets hot the bearing will stop spinning and then you know it's ready but don't get it to hot. Use a small screw driver to turn the bearing.When you feel drag pull the heated plug out of the bearing and drop the crank in. This is a very easy way to put the engine together but you can get it wrong very easy.

ShadeTreeFab:
BDI- i like the plug idea, i use an old impact socket.

mustangfury:
Thanks for the ideas guys. I will get as far as I can and will get back with questions.  My trucks U Joints just started showing signs of binding in the 4x4 so that will have to be fixed first unfortunately  :-(.

thanks again,
stang

mustangfury:
I have taken off the cylinder, carb, right cover, clutch, primary drive gear, left cover, and am working on the stator.  Any suggestions on how to remove the flywheel?

I noticed there is a little play in the drive shaft bearing as well. Should there be play in that? It only moves a little. I just want to replace that while i'm at it if it needs it. It is the bearing on the shaft that the clutch bolts on.

I will probably have the engine pulled within the next hour or two. let me know what I should do next.

Thanks guys,
Stang

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