Hi Rob!
Is it new HEX file? As I remember pin.9 is a HV generator? What is R2 connect to what? Is it RESET? Is X1 the same or we don't need it? Is R3 and R14 really 33k may be better ~680R? BT151 is SCR, may be mistake. And what do you think: can I run ignitioncoil from 8VDC(2LiPo) or we need strongly 12V? Sorry for frash, english not so good.
BR Iura.