It's a pretty solid little engine on there, keeping clean gas in it will go a long way, I'm not sure about the smaller honda engines like you have, but on the larger ones they have an oil spinner that is a little spinning cup that separates the metal from the oil, they are often under one of the two round covers on the engine, right side is most common, if you don't have one then doing an oil flush might be a good idea to get the 30 years of sludge build up out.
You can still get a few parts at the local dealerships, MrCycles.com and other online dealer parts web sites also stock a lot of parts still, but Ebay tends to be the best route for both new and used parts, nice thing is tho, once it's working right it should be years before it needs more attention.
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