Petrol engines aircooled Modifications
HM: This link might be worth reading, particularly the reference to EGT gauge for confirming jetting, fine tuning... (an easy relationship on a diesel more fuel, higher EGTs! Opposite to petrol with weakness putting up EGTs (due longer burn time)
Then there's this about different dizzies Vs certain carb types being used
and this abut jetting (different take on main/idel jets than from rhinoracing above...