The flywheel measured at 8” and does have a place for model and serial number on the rope sheave like the ’28 chief sheave at this site http://www.ahlstrand-marine.com/ under outboard museum then antique motors for sale. The motor is in a bad place and pretty dirty right now. I’ll have to try and find the numbers later. I did see the number 520 at the front bottom of the crankcase.
Thanks
Glen
Edit: Someone scratched in RACE for the model number 🙂
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