I would think them filters would get soaked with oil after a couple rides no?
Mike if your playing in the pow and smoking the odd bull rush here and there to the point your machine wouldn't run, I would think you'd have to change the kn or clean every other ride. Under the hood or beside air box it'll get wet. Oily vent or water, them cat tails, bull rushes and powder will clog that up in no time.
Here's the 07. 1 ride. 95% groomed trail and played in one field Washing the filter and seeing the crap come off it in the sink would explain why his idle was down to 1300ish and it kept stalling when he came to a stop.
Not bashing the filter, similar terrain over here in mb. If you do the mod I'd highly suggest an outerwear or something that will repel the snow from sticking and anything else that may get under the hood.
Can't seem to post pics. I'll try later.