Hi everyone. I'm new here, and I'm hoping you guys can point me in the right direction. My Shee is a 421, but with stock head/carbs/ports. The previous owner did the motor work, and the bike has run great, until now. I stripped it to the frame and did suspension work, and took care of worn parts. Put it back together and the right side is still running ok, but the left side has what I think are pilot issues. I did pull the bowls one at a time and checked for cleanliness. When I try to let it drop to an idle, the right side runs along fine, but the left puts the cylinder out. It's for sure a rich condition, as the plug is black and the pipe gets cold. It did not have this issue until I tore it down to redo the frame. The motor was not even opened up, except for pulling the carbs and reed cages for a fresh coat of paint. I'm trying to narrow down if it's carb or ignition. It runs great on the pipe, but as soon as you try to slow speed ride it, the left side loads up and puts the cylinder out again. Any suggestions?