Well I sold my large two strokes a while back and memory fades,so the best way to answer your question is to say a decent Ryobi will turn an 18x6 or 16x8 Zinger at 7000 with no problem,but will outweigh a 1.2 2stroke glow by a large margin.Trying to replace a stout 1.2 2 or 4 stroke glow with a Ryobi,even with a CH ignition is a marginal deal,and probably not a good idea if performance,such as the dreaded hover and unlimited vertical is your idea of fun.This would be the work of something like an RCS 1.4 IMO.
Gas looks better and better the farther up the size scale you go,and 1.20 sized planes are about minimum for conversion.
My C$.04 worth....