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The OMC generators use a toothed belt with corresponding tooth pulleys on the flywheel and generator. My best guess is to eliminate slippage since there is a very narrow range of adjustment to keep the belt tight.
The solid state voltage regulator employs a solid state current limiter set for 10A. All three mechanical units and functions are replicated with solid state devices.
Another detour…….
In a mechanical regulator the cutout is not a relay as most people think. A relay will not work in this application and cause the battery to discharge into the battery at low generator output.
The mechanical cutout is actually a mechanical diode that will only allow current to flow from the generator to the battery and block current flowing from the battery to the generator.
These guys were clever how they achieved this with just two windings, a spring, electromagnetic core and contacts. It still amazes in both the simplicity and complexity in creating a mechanical diode.X