first off an 1800 rpm generator will ALWAYS be much better than a 3600 rpm generator. SO THAT is the real answer.
Second... for emission purposes, and more power in the same form factor, is why most went to overhead valves. Met that a smaller engine, less weight could be used, with mostly aluminum/potmetal parts, cheaper and faster to make, but basically a throw away engine.
The are still thousands of great onan and Kohler flat head 1800 rpm generators running today and will still be running long after the ohv engines are dust. This is why you are rebuilding the Kohler engine, as it can be rebuilt, and will be around for your great grand kids.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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