The Little Wonder Open Crank Stationary Engine Fully Machined Kit.
Loosely based on the Amanco , Fairbanks Morse Engines.

Full instructions, complete with all the pre machined gears and parts to make this model.
The only other things you will need is Fuel and 1.5 - 2volt battery and charger.
All described in the instructions.

8 1/2” Long when fully assembled

4” diameter Flywheels

7/8” Bore X 1 1/2” Stroke