1996 polaris xcr 600 sp. last night i went out sledin wi my family. while i was goin threw a trail i nailed it n it didnt have the response it did earlyer. i pulled out on to a fire road n cranked on it but it would only rev to 8000 rpm normaly it goes to 8600 or 8700 rpm. so i stoped n dad n i noticed it was missin. i looked at the tach. n it was revin 1000 at idle. normaly its revin 1500-1700. we pulled the plugs n the clutch side one was wet. we pulled the top of the carb off, cuz we had troble with it b4. but it was fine. dad put his thumb over the plug hole n i pulled. there was no compression. it wasnt running lean for sure. last week i had it tuned n it had 135-137 psi in each cylender. im wonderin what happined? if the crank went it would scuff all 3 but only one isnt workin. need ur imput!!!!!