I haven't gotten around to the exhaust rubbing yet but I plan to this upcoming week, I have however tried the other stuff that's been mentioned. today's ride I ran approx 60% av with 40% 94 octane. the sled behaved the same as on ~30%, throwing the det code going in or more so off boost. It was deep powder, I left it running rich but lean enough it didn't have a total bog in the bottom end. I had one time I went to grab some throttle right after a climb and the sled gave a literal puff sound Like a back fire sputter and then if immediately threw the det code, when that happened I was running around 10:1 on the a/f, real rich. The other time I had snow all over the snorkel and may have been from lack of air, sled deff fell on its face from lack of air and then threw the det code, and other usual times was when I was off the throttle after wide open, I did some climbs, a/f was steady around 11:1, never seen any lean outs and climbed well.
I took the timing key off, played around, threw the det code under same situation, did not notice much difference in sled otherwise.
On the way out I noticed my a/f gauge wanting to stay at - - - as if it's leaner than the 17:1 or so that is its max reading, give it throttle on and off it did bounce back and around though, slow taper into hearing the turbo wind up and maybe boosting? Stayed there on the - - - then it would peg down real rich. I wonder if my 02 sensor is saying it's had enough? Sled ran fine down the trail otherwise. However idle it did read around 13:1 or so, so not sure what to make of that.
One thing I forgot I noticed last ride I forgot about. Is some sorta metallic like tapping/ticking noise? It only makes it on light throttle, as soon as you let off its gone, and when you give it more throttle you don't really hear it since the turbo wants to start to light. I have looked under my hood and can't see anything, I was thinking maybe it's my clutches? Or primary? Hmm...