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Next up is my Type 110. The internals on some of these earlier models are so different from the later engines.

You've just rebuilt a later Comet C/Saw, did you not note the engine Type (I can't see it clearly in any of your pictures)? I found this engine in my archived Comet pictures; with the correct stop switch, notches in the mounting flanges & no hole in the carb for the air cleaner screw, it's also a Type 110. David

The cooling baffle indicates it's probably from a circular saw. I don't remember ever seeing those on other tools.

My engine before assembled to frame

Well...decided to put the 1.2 horsepower Tas motor used in the Aqua-bug/Bike-bug and Sears Gamefisher outboards in my second Petro. Besides more horsepower, the coil is neatly positioned inside the flywheel cover, and the intake port is actually in the cylinder. There are no reed valves. The gearbox side has the same 3 hole pattern, and crank end has same length/taper. I will be modifying this to produce more power by way of increased compression, porting and carburetor/exhaust improvements. Wait till you see the tiny expansion chamber I build! World's fastest Little Petro???