With the ignition system from CH, you can remove the front shroud, cut down the rear back plate and the engine will look like it was intended to be a model airplane engine.

With a Walbro 11mm carb like a WA167-1 or WT499 it wil, turn a 18-8 prop around 7500 rpm.

I have two of them.

13 pounds thrust and 50 mph