Petrol engines aircooled Modifications

This link might be worth reading, partic 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)

carb tuning (Rhino racing)

Then there's this about different dizzies Vs certain carb types being used

From aircooled.net

Aircooled.net - dizzy type Vs carb type

and this abut jetting (different take on main/idel jets than from rhinoracing above...

Aircooled.net - jetting

Rgds