Good luck trouble-shooting. This is an 11mm carb, right? I wonder if that's a tad big for a 30cc. ESPECIALLY given you have a REALLY short air path because the carb is mounted directly to the head intake. Usually there's a pipe going down to the carb, adding some head pressure. These are just some things to think about. I used a 6.5mm carb on a Saito 1.5 and it worked nicely.