Just reassembled the bike after installing stage 7 needles, 150 mikuni main jets, and replacing two coast enricher diaphragms there were completely deteriorated. I've got all the carbs sync'ed, and it runs great everywhere except for a hesitation when coming off idle from a stoplight, and a hesitation when blipping the throttle to downshift. When playing with the fuel mixture screw, I noticed that the right rear carb did not have any effect on idle regardless of where the screw was set. With the other ones, I noticed at least some change in idle when the screw was seated all the way. So I'm concluding that the right rear (#4?) is not working at idle? While the carbs were out, I checked the dry float levels, and pulled the jet block and checked everything. Where should I begin to try to troubleshoot this?