Join Date: Dec 2010
Thanked 97 Times in 91 Posts
I also would lean towards the rings. Blow by around the rings is pressurizing the crankcase forcing oil vapor into the air box.
First, compression test, if good conduct a leakdown test. The leak down should tell you what the problem is.
How many miles on motor?
If the compression is good, you could pull the crank case vent off the air box, clean the air box, put a new set of plugs in a see how it runs.
Arctic Cat Service Tech
Retired Coast Guard Chief Engineer.