ORIGINAL: alvinl
The clutch bell and parts may fit on the sh motor, I cannot say. I would guess so, but that would only be a guess. If it's not a rotary carb, I wouldn't mess with it. For not much more, you can get an OS .18 cvrx motor that is a direct replacement.
+1 for that. Really, any .12 to .18 engine WILL fit into the mounts, but depending on the chassis design, thats a different story, but most SHOULD fit. Also, the larger the engine (in most cases) the more fuel it will use up.