Hello, I just bought a 1986 XR 600. The bike is stock except for a Supertrapp. When I went to look at it it was 40° out and we couldn't kick start it, not a pop, even with eather. So, we pull started it and after a while it started to fire but took a while. We finally got it running but it smoked alot and ran like crap, although it would run as long as you kept the bike moving or kept into the throttle while sitting still. It would stall if you tried to let it idle. I pulled the plug out and changed it, still nothing. I then took both carbs and cleaned the pilot and mains, they didn't even look that bad. I noticed the bike didn't have an air filter on it and don't know how long it was run like that. It has ok compression by kicking it. Now when I spray either in it the bike will pop, run for just a split second and die. The guy claimed it kick started and ran fine 2 months ago and seemed very honest. The petcock flows fuel fine. Headlight lights up when you kick it. Could the rings be toast to the point where it won't start? I didn't take the chokes apart or mess with the mixtur screw. Could the bike possibly be very lean with no filter, cold weather, and the Supertrapp? Any help would be greatly appreciated.