Is tuning using the head temp a good way to tune a China 66cc? I'm getting 245°f at the head by the spark plug. I know I can go hotter but I'd like to keep the temps as low as possible. I haven't pulled the plug yet. I'm running a sbp pipe and the exhaust temp is about the same as the head. It runs ok, sometimes at wot it stutters. I don't mind going to a smaller jet but I want to know is going by temps an ok way to tune? I've tuned smaller 2 stroke motors using temps but what about our motors.