Re: Found another engine...DIESEL!
Some RC guys are building semidiesel engines out of cheap Ryobis and other weeder motors. The Ryobis are reported to have a lot of power, even if not made of the most durable stuff. I'd agree. I've had Ryobis and Poulans (used as stock weedeaters) that had impressive power, but the overall design compared to a Kioritz/Echo or Mauryama (used them for years in lawn work) etc was junk (rough castings, cheap bearings etc.) I think the Ryobi must be the happytime of the RC world. There are lots of adapters for props, glow plugs, mufflers and mods for them.
A couple videos I saw showed a glow plug replacing the spark plug, which was heated by applying current till the engine started, then the current could be switched off and it still ran (on some mix of gas and kerosene I think).
I don't know if they changed the timing or milled the head.
1" roller Dax Friction Drive and Tanaka 3300 with mods.