Had the sleds out last night. Were riding in weird snow. About 4 inches of sleet w/ a slight crust and 2 inches of powder on top of that. Temps were prolly around 10 degrees f. Got onto the groomed trails, were on a wide flat trail and were running around 60 mph and rpm's were a consitent 6000. We varried the throttle but 6000 was about the norm. We stopped at an intersection and I noticed a glow from the bottom of my fiances sled(buddy was riding it). He hit the throttle and sparks and blue flames shot out. We shut it down and let it cool. He was following me and was getting a lot of snow dust so I decided to use the carb heaters. Heard that it'll make the sled run a little richer so hey, they're there, use em. Ran home after that(about 20 miles) with all kinds of trail conditions and never had a problem. Oh, the ride was great. I've been having a problem w/ a slight bog just off of idle on this sled and it's still doing it. When I had the carbs off the last time I noticed the slides look like they have a slight difference in the gap between each other. Couldn't really measure it w/ calipers so I shrugged my shoulders and put them back in. I'm assuming that was wrong and they should be exact. How do I adjust this? I have the equipment at work to measure it. I'll put it up on a comperitor. What other causes for the cherry red can?