So, Throttle Position Sensor is bad, parts back-ordered till mid September. Local shop calls yami service rep, he said it's ok to disconnect TPS and run. Will not hurt CDI, just defaults to 2d mapping, 2d only no 3d. OK! Rode today the bike was great. Without TBS seem smoother, ignition advance seems slower. The bike hooked up better with a nice smooth hit in the middle. I ride trails only, might not be great for mx. It worked good for trails! I've struggled with TPS from day one, thought it was a jetting problem, it was not.