later this week i have to look at my friends 07 YZ450, she tells me its using all its oil in one ride, she tells me its smoking, white i believe. she also told me that all these problems started after she didn't drain all of the oil out (when she did an oil change) and she over filled it. I've not seen it yet so these are just starting theories, 1 the head gasket is blown and its forcing all of the oil out into to water system? 2 it has a hole in the casings somewhere? surely it cant be burning all that oil in 1 ride, can it?