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I’m just getting back to this project. The serial # is 43128, which puts in the latter part of ’26. I have an AZ-35 powerhead and another opposed A (haven’t got to degreasing them so I can find other markings).
The strangest thing is, the Franken-A’s water tubes are all backwards. Where my other 2 opposed A’s have the water line from the front of the leg go to the bottom of the jugs, the Franken-A has its front water lines going to the top. The lines are all un-plated (painted?) copper so clearly they’ve been replaced; have you seen this on other engines ?
The magneto that you’ve ID’d as the likely one that mates with the engine is a dud. The other one I have has a fat, crackling spark on both leads, so I may have to do some mag parts swapping.
What was the from-the-factory compression number for this motor ?… It’s at 50 — no idea when it was last run but i’m sure the cylinders are very dry. My J-25 runs quite well @ 50 — a little rough idling and slow to accelerate, but then so am I and it’s got 30 years on me. 😉