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It will run on petrol or liquid camping fuel such as Colmans as is or could have a modified carb so it can run on propane and probably the camping mixes as well.And there was me thinking the name stood for Rusty little engine Graham, out of interest did you sell many of the air cooled versions as you don't see many of them about mostly all the hopper cooled variety.J
Another two piece piston I saw one on Deltatango's Mastiff build. Do they offer a significant advantage in weight saving or ease of construction?
Maybe Graham can say why he designed the piston this way on this engine.