I just put a new OS 15 cvrx in my RC10GT. I have low speed needle out right now about two turns. I have high speed out 2 and a half turns. Keep in mind I have tried every setting I can think of besides these current settings. No matter what I do, the engine runs 3 seconds and quits. After that the engine won't start again unless I remove glo plug and hold car upside down and pull starter to clean things out. I'm really about ready to give up.