ORIGINAL: w8ye
I've seen several four stroke glow engines like OS and Saito with C-H ignition and the people were running glow fuel slow flying J-3 Cub type planes
One of the most rusty glow engines I've ever seen was a Zenoah G-23 Glow engine.
That is because they did not treat it like a glow engine...lube it up good with after-run oil!