Diagram
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System Type
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Vehicles Using
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Description
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British DC Generator
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Triumph, BSA, Norton and others through the 1960s
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One of the earliest motorcycle charging systems. Note the positive ground.
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Euro DC Generator
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Moto Guzzi & BMW through the 1970s
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Identical to the British example except for the negative ground.
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Harley-Davidson DC Generator
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Harley-Davidson Big Twins through 1969, Sportsters through 1984
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Very similar to the Euro DC generator, except that the regulator is self-grounding.
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Early Half-Phase, Permanent Magnet Alternator
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Off-road machines, very small bikes and scoooters
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Some examples did not have a regulator but relied on the loads themselves to keep output in check.
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Later Half-Phase, Permanent Magnet Alternator
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Later small motorcycles
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A later, improved version of the previous system, wherein the regulator is incorporated into the same housing as the rectifier.
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British Single-Phase Permanent Magnet Alternator
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Triumph, BSA, Norton and others from mid-1960s through end of pushrod era (1980s)
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Dual voltage control -- a switch-able stator, and a zener diode regulator. The zener was simply a resistive short across the battery that automatically turned on at a preset voltage.
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Early Non-Brit Single-Phase Permanent Magnet Alternator
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Asian and Euro twin-cylinder machines through the 1970s (CB350, CB450, etc.)
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The Asian version of the switch-able stator system, with the notable improvement being the use of an SCR based regulator that shorted the stator instead of the battery.
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Later Non-Brit Single-Phase, Permanent Magnet Alternator
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Honda CB/CM250, smaller Polaris ATVs
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More modern version of the single phase system, with the regulator incorporated into the same housing as the rectifier.
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Early Three-Phase, Electromagnet Alternator
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Medium to large Asian multicylinder bikes (CB750, CB550, etc.) to about 1975
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Long the traditional alternator, this one continues today in the more modern form shown below.
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Later Three-Phase, Electromagnet Alternator
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Large Asian bikes after about 1975 (CB750 Auto, other Honda fours)
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More modern version of the three phase electromagnet system.
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Early Three-Phase, Permanent Magnet Alternator
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Four-cylinder Honda Gold Wing through 1979, KZ900
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Permanent magnet version of the three-phase alternator
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Later Three-Phase, Permanent Magnet Alternator
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Four-cylinder Wings after 1979, CBRs, ZXs (in fact nearly all Kawasakis including ATVs and watercraft), GSXRs, later Ducatis. The most common system in the powersports industry at present.
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More modern version of the three phase permanent magnet system.
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Three-Phase Integral Alternator
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Six-cylinder Gold Wings, Suzuki Katanas, a few Kawasaki models (early Concours, Diesel Mule, ZR1200, ZRX1200R)
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Uncommon, very automotive design, fully self-contained
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