Ok, so I got a YSR with a Lifan XR100 clone engine. I have done some work on the bike and have gotten it pretty close to running right. My problem is that it starts fine, idols fine, but when the RPM starts to climb it starts missing. I have checked the carb and it is spotless. I have re-jetted it and now the plug looks nice. Chocolate brown and dry. It really only starts cutting out (almost like a miss) around half throttle and higher, but only after about 3000 RPM. Could it be electrical, or more likely fuel? It doesn't cut out when it is out of gear, only under load. I have the clip on the needle set in the middle, a 92 main jet, 38 pilot jet, and the fuel screw 2 turns out. Oh, I am at 3200 feet. I do have a 95 main jet in my tool box. Any suggestions would help as I am not that great a tuning a carb.