Hey fellas how are ya I'm new to this forum but did surf the 650 one quit a bit last year and got some great advice. I have a 1980 xs 400 with a 81 special engine along with seat gas tank and side covers.. I had a heck of a time wiring the bike because I had it all apart and painted the frame.. I'll post a pic tomorrow.. Anyways I'm trying to get the carb tuned I made my homemade sync tool and did that I bought an carb kit from mikes xs that came with a number 30 drill bit and drilled the air lift and put in 45 pilot jet 145 main I have my needle set on 3 third from bottom. I tried dead cylinder method with my fuel mixture screw but it seems to only work on the left cylinder and the bike stalled when giving it a little throttle but runs better once warm, and back fires like crazy. Any help or ideas would be much appreciated