i recently been working on my grizzly 700 2007 it started smoking blue and has gradually gotten worse Ive done a compression test without the throtle and was 60 psi and did it with throttle wide open its as 70 psi but running it its blowing blue i changed oil from 10w-40 to 20w50 cleared the one breather valve with was clogged but it had a plug on the end what else can i do the machine runs fine it just constantly smokes i have no more ideas what it could be please help