Here are a couple of nice engines that look pretty similar. Engine aficionados will note that the one with the new paint fob is a hit and miss model, and is the older engine. It has a thermosyphon cooling tank, which was soon phased out to a tray cooling system, and later, to a screen cooler over a tank. The thermosyphon used a lot more water asn was heavier to move around. The newer, original finish engine is throttle governed.
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