Hi Richi-d,
I have used regular gasoline in my dynajet many years ago, even better to use white gasoline (benzine). The key to starting is to get the right amount of air and fuel into the venturi while you have a big spark going. We used an old distibutor fitted with ignition coil and a handcrank at the time....
You need lots of compressed air until you learn the trick... I found that a small amount of air that just about openes a few valves would do the trick. Dont forget your earmuffs and dont get a fright when it starts....its awesome. It gets red hot unless in an airplane where some cooling air flows past.
As far as safety goes have co2 available. If fuel accumulates in the engine or outside, kill the spark and blow clear with air first.
Good Luck
Andre