What sort of boost/rpm do you reckon it'll be running at? I didn't see any mention of a control system aside from the ignition box (CDI?), the gauges and the blank control panel... I understand the basic principle and how to start it well enough (leaf blowers seem popular ), but i'm not sure how you control RPM or stop it overboosting and lunching itself once it's running. Does the ignition system provide some kind of variable spark frequency control, or is there some kind of fuel-choke system? Will it be burning LPG or propane?