just got back from west. put 80 miles on belt at home for break in. got out there and belt blew at 80 miles just boondocking no climbing. put new 377 on not broke in. it lasted 35 miles. so the last 2 days i ran a 166 with 1000 miles from my 04. ran the hell out of with no problem. but heres the deal i let the clutches cool down every 1/2 hour. it's deffinatly a heat problem. wheather there is some clutch issue i don't know yet. also my throttle stuck WFO yesterday morn. it does ride nice though. ski-doo dealer in west sucks big time too.