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Would that be a 1946 TD20? Look for the model number stamped on a raised boss, on the engine case.
And you will need to remove the flywheel nut as well as the pulley sheave, to extract the flywheel. Three screws into the flywheel, plus the puller pressure stud bearing on the crankshaft end to extract it. Beneath you will find two each magneto coils, breaker points sets and condensers.
The points hold up well, the condensers are a crap shoot (as ever). The coils also seem to do pretty well, though the plug wires might be suffering. If you need to replace the plug wires, you’ll have to solder in a couple lengths of 7mm copper-core ignition wire, which is available from O’Reily Auto and other sources.