i rebuilt my sled not to long ago, and i didnt have much time to mess around with the engine. it worked for awile perfectly, then i went on a trail 4 like 20 miles, and it started running rough when it was hot. we just got like a foot of snow, and the sled satarted sounding funny, i checked the plugs, redid the carbs, and almost everything else. i think there is a somewhat new muffler on there because on the right side of the sled, it looks like all of it was replaced, and i was wondering if the muffler might have something to do with it or there is something else.
thanks
thanks