I got a chance to clean off my engine code, and, surprise, surprise…it’s not the number listed on my bulkhead. It’s actually H743U577 (the best I could read). The “H” series is actually the right one for my year, but I still have some questions about this particular engine.

Not sure why the voltage regulator is on the generator, don’t think that’s right.
Not sure the oil bath cleaner is the correct one.
The oil filler tube has been modified in some way.
Not sure the distributor or carb are the right ones.

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