[freddie696]

The air box on my 2003 350 keeps getting oil in it, motor was smoking, and blowing oil into air box when i got the bike last year, borded cyl out 30ths, stop smoking, but still gettig oil in airbox,

 

[Michael Fisher]

I dont know what is causing your problem however I have seen it before, I bought a new 350 rancher in 2000 which did the same thing I returned it to the dealer several times and each time they could not find anything wrong I finally complained enough that I was allowed to get another bike! Hope you find the answer to your problem im curious as well.

 

[Redracer]

The only 2 things I can think of that cause that is standing the quad on end can do it, and too much oil in the case.

 

[Saber6]

Oil level good in the case?