Why has your 2 stroke oil turned grey Have just bought a 2 stroke water cooled motorbike and the engine oil is grey and slushy. The radiator water is still nice and green. Does it just need a change?

Clutch material !

As long as your coolant is not dropping it sounds like its just clutch material. Time to change the clutch plates ! Pretty easy if your mechanically inclined and have the service manual.

OR

If you have to keep filling your radiator then water is getting in the oil. This can be caused by lots of things but more then likely you have a blown head gasket or warped head , this happens from over heating.