We messed around with one of our tons for better part of yesterday. It was popping on accel, and kind of running crappy. Must have pulled the carbs and caps of 34 times, fiddling with air screws, needles, cleaning jets. It would only run half decent if you held the choke on part way. Finally gave up, filled the tank, and went riding. The the sled ran great.
Moral to the story.....quit listening for every tick, burble, and pop....and ride. They seem to clean up after running them hard. And idling they make lots of weird noises. My clutch chatters a lot. Sound like they're coming apart. I've adjusted valves...it's a pain...and has not made any difference in how they run.