2001 kx 250 gray milky oil

Oil turns milky after an hour of riding like anti freeze is getting into my oil any suggestions ??

Gray is most likely clutch material, somewhat normal. Milky might be water pump seal.

Milky is most likely water pump seal

A few things.  Clutch debris is one.  Water pump seals should leak out the weep hole before leaking into the cases but I have seen the weep holes plug.  Many bikes have a water passage between the side cover and crankcase (if the water pump has one hose you have one of these passages and two hoses you do not).  I have seen failures in the side cover gasket in that case.  Generally, if there are water passages in the center crankcases they are at the front of the engine and will leak into the combustion side and not the transmission side.

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