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Maintenance can go as far as you want. Here are a few things to consider.
Carburetor-a cleaning and rebuild is in order. You will need new primer seals, and also a new float. A modified plastic ethanol resistant Mercury float is the best option here.
Ignition-inspect the sparkplug wires. If the insulation is hard and crumbling, new copper core wires can be carefully soldered onto the coil buttons. The ignition components are often times still good. Clean all contacts. Inspect/clean and reset the points. Lightly lube the points pushrods.
Starter- remove the starter and inspect the three tiny pawl springs. If one or more of the springs is missing/bent/broken, then new ones can be made. Ray Schaber wrote an article with directions on how to make them. Of course the starter rope and/or spring may need replacement. For peace of mind, it’s good to take the recoil spring out, inspect it, clean it, and re-grease it. One small kink, and it is a matter of time before it breaks.
Waterpump- a new water pump is a necessity. While apart inspect the housing and the elliptical. Behind the waterpump is the intake grommet/seal. These seals can degrade and swell effectively closing off the cooling water supply. Opinions vary some prefer to trim them, but replacement is even better.
Improvise-Adapt-Overcome