I don't think they are very fussy about the fuel used. They usually only have a dipper on the conrod. The really old ones often only an oil dripper and a cast iron Piston.. Larger stationary engines were two stroke and used Hot bulb Ignition heated with a large blowlamp prior to start up and a fuel injector which was also used to start it. Flywheel was about 18 feet diameter and these things were used in sawmills. I've seen one operating in the Dorrigo when I was young. (in the 60's). Nev