I have a 2010 800 rmk 155, I absolutely love this thing, coming of a 2003 edge. None of the dreaded stumbles, stutters or det light talked so much about on here. Dealer said put in fresh 87 octane gas with ves 2 in tank,broke it in with that, wires unplugged. Pulled 8100 rpm first 40 miles now with just 80 miles pulls 8250 rpm completely stock on 87 octane. Cant wait to put in some 91 octane and wires plugged in. I too believe that those having problems with this 800 must be set up wrong. I Have four buddies that bought 09 800 sleds from this dealer with no motor issues, all are happy campers. Find a good dealer, and you wont look back!