Short video of starting a home shop machined 10 cc four stroke model engine built using 1946 Popular Mechanics Magazine plans. Engine case and cylinder head are sand cast aluminum. The cylinder is a machined aluminum round bar with a cast iron sleeve. Piston is aluminum and has two cast iron rings.
The points are standard GM V8 car parts. The spark advance is adjustable with the small brass handle on the back of the engine. Bore is 1 inch. Built using a 1941 9inch South Bend lathe and a new Sherline 3" lathe.

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Here is a link for the Sherline Lathe just like mine https://amzn.to/31D7HCN

Uses a 3volt model electric model airplane type coil and two D size flashlight batteries for ignition.
This engine is sold by Coles Power Models (now in Texas) as a casting kit known as the "Water Witch".
A remarkably similar engine was published as a project in Popular Mechanics Magazine in The October and November 1946 issues page 201. "Model Gas Engine" I copied the article from Library copies of the magazine and used a magnifying glass to read the small print on the drawings in the article.
Back issues of Popular Mechanics are now posted online at http://books.google.com/books?id=IuED...

The gears were purchased from Boston Gear. The the crank shaft is supported by two ball bearings. An old Champion "V" was borrowed from an old model airplane engine.

It will run about 3 minutes on a teaspoon of "camp fuel" aka Colman fuel. Also runs fine on regular gasoline.