Thanks for the comments
Was no build log, was not sure of what I was making till it was done. Major pieces were made to a jig. A lot of moving the pieces around to get the separate cuts. Thought I would get fancy and do a flywheel spinner, forgot that the spinner has to be a rotating shaft and, well, OOPS, having the flywheel and spinner each with there own ball bearings did not quite make the grade. Conrod bearing came from a 'puter cooling fan.
Piston and cylinder are from a "Thank You" free sample Airpot. Think the orifice as supplied was 0.140" I enlarged it to 0.187" did not have any great effect upon its speed.
Pic is of the jig layout I used to fabricate the pieces, long as it fit within a 6 inch envelope was doable. Other shot is better view of the silly thing.
Fancy or not it is fun to turn lifeless hunks of metal into something, just go easy of defining "Something"
Robert