I know there's no fuel coming through the idle circuit, but I don't know why. I've encountered this problem before and never got to the bottom of it. I've removed and thoroughly cleaned the carb. Even removed the side cover and checked all the little holes that dump out right by the throttle plate, and the passage back to the main jet tube. Sprayed carb cleaner through all of them, but there's no fuel for idle. I set the governor up to blip the throttle before it dies, and it will run by surging up and down with the throttle blips, but no smooth idle. What makes this particular model not draw fuel for idle? It's driving me nuts!! It's the carb with the plastic main jet and "o" rings. I replaced them last time but it didn't help. It runs smoother with the primer bulb held in, but I think it drafts fuel through the priming hole in the intake side of the carb. Covered the primer bulb with plastic wrap to check for holes, no good. WHAT IS IT that keeps fuel from flowing through that idle circuit??!!?? HELP!!!