I bought it new a couple weeks ago. I didn't buy the warranty, so I guess I'm screwed.
It sure sounds like a definite rod knock. I used a stethescope and the noise seems to be coming from the crankcase, not the from the clutch. I'm going to dump the oil tomorrow and see what I find. I see the crank is a pressed pin type. I've rebuilt a few hundred of those when I had my Yamaha dealership. It seems that Arctic Cat only sells the complete crank. Anyone know this for sure? If I could get a rod and bearing, it would be an easy fix.