Well,how about the new Dle 20 engine?
A 20cc gas engine is 1.2CuIn and is a two stroke. It can be argued that you get somewhat less output than from a glow engine but you can easily compare it to a 1.08CuIn two-stroke glow
The Pawnee being called Pawnee 40 (0.4CuIn) which is probably underpowered but there is plenty of reports of it flying exceptionally well on 0.70 - 0.80CuIn Four Stroke (0.60CuIn Two Stroke??
Mine flies on a 0.80 Saito Four Stroke and has power to spare.
Even the smallest gasser would therefore be an overkill in a big way.
Remember, the full size Pawnee wan't exactly a powerhouse. Often been referred to as a low wing Cub