I personally would favor an Enya carb as one for an engine that size would be a metered airbleed instead of the standard non-metered airbleed of the OS FP series. BUT - the OS carb would likely work just fine. The Enya carb would work as well; just a little better. Since you’re not dealing with a monster powerhouse revver of an engine, I don’t think you need to be too picky.