I have a 90 yz250, it has power, but had trouble idling. I cleaned the carb and everything, changed the oil. But it blows which smoke (radiator fluid i believe). Right now there is just water in the radiator. and it seems that one: it's getting into the chamber and being burned causing the white smoke, and two: is getting into the transmission oil, causing it to get that cloudy color and thick, which in time bogs on the clutch, so that it won't idle with he clutch in, only in neutral. Any ideas of fixes, or easy tests I can do to know? Maybe a dye in the radiator fluid?