I was speaking generically of small engines, including outboards, motorcycles, etc. For example, regulated alternators didn't appear on outboard motors until the mid-eighties, when increased electrical power demands necessitated higher-output alternators.
Shunting regulators are quite common on motorcycles, and I assume that's the design used on most small engines. It's really the only way you can implement a regulator using SCRs. Silicon-controlled rectifiers are curious devices: you can turn them on but not off. (A triac is just two SCRs back-to-back in parallel.) The behavior of SCRs isn't a problem when switching ac, since the signal turns itself off every half cycle. Now in the case of lighting dimmers, SCRs are used exactly as you describe: the SCR is triggered partway through the half cycle, so only a portion of the waveform is passed to the load. But lighting dimmers are open-loop devices with no feedback loop. Voltage regulators are closed-loop devices; they need a means of turning the power OFF as well as on. Since an SCR can't turn off, the solution is to short out the stator output using the SCR as a shunt.
The link below has the schematic for a rudimentary shunting regulator, and a good discussion of the theory of operation.
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Today's Featured Article - Museum Coverage: The Stuttgart Agricultural Museum - by Cindy Ladage. While cold wind was blowing back in Illinois, in Arkansas, daffodils were in bloom, and the Magnolia trees were adorned with fragrant blossoms. Stuttgart, Arkansas was the site of this year's winter Minneapolis Moline Collector's show February 25-27, 1999. The show was held at the Oliver Museum created by Don Oliver, the pioneer of the four wheel drive tractor. Oliver along with Gale Stroh and Kenneth Bull using Minneapolis Moline tractors and parts created what has become known as
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