Weight is not an issue. This engine only weighs 1 oz more than specified engine weight (assumming its designed for a 61 2s). Power wise, well thats a person opinion too. My H9 60 sized mustang with a Saito 100 seems underpowered (falls off the top of a 100ft loop). My friend has the same plane with a 61 2s and he flat kicks my butt.

Bottom line is that no plane can withstand a hi speed dive no matter what engine you have on it...