I have a 300 Tyga conversion kit which I wish to fit to my MC21. At present in 250 form, it runs on 185/182 main jets with powerjets blocked off and HRC B needles on middle setting. Airbox lid is removed but filter is wired in place. It also has open pipes (Tom Crawford USA?).

Any advice / help greatly appreciated as I can't afford to blow this engine!

I live in Lincoln GB. Many thanks, Boyoink