Small Twins (Model W / 45 / K-series / Sportster)
| Model | Engine | Years | Notes |
|---|---|---|---|
| Model W | 584 cc flathead flat-twin | 1919–1923 | First of two H-D flat-twin motorcycle designs put into production, first H-D flathead motorcycle. The fork was a trailing link design. |
| D-series (45 solo) | 739 cc flathead | 1929–1932 | First H-D 45 cubic inch motorcycle, first H-D flathead V-twin motorcycle. |
| R-series (45 solo: R, RL, RLD,) | 739 cc flathead | 1932–1936 | Second series of 45 solo |
| W-series (45 solo: W, WL, WLA, WLC, WLD, WR) | 739 cc flathead | 1937–1952 | Recirculating oil system introduced on all H-D engines in 1936, R became W to denote this. WLA and WLC were military models, WR was a racing model |
| Servi-Car | 739 cc flathead | 1932–1936 (R-series engine)
1937-1973 (W-series engine) |
Discontinued after 42 years in production. From 1964, the first Harley-Davidson to receive electric starting. |
| Model K and KK | 750 cc flathead | 1952–1953 | Last 45 street solo, all-new engine, first civilian H-D with rear suspension |
| Model KR | 750 cc flathead | 1953–1969 | Racing Only |
| Model KH and KHK | 883 cc flathead | 1954–1956 | KH-series: K series with increased displacement. |
| XL, Ironhead | 883 cc, 1,000 cc (1972–1985) |
1957–1985 | The first year of Sportster, a development of the KH with overhead-valve engines and cast iron heads. The engine was updated after 29 years. |
| XR-750 | 750 cc | 1970–1985 | Overhead-valve engines, iron heads (1970–1971), alloy heads (1972–1985) |
| XLCR | 1,000 cc | 1977–1978 | Discontinued after two years in production, overhead-valve engines, iron heads, solo seats, snake exhaust, also includes reverse shifting pedal, and rear pegs. |
| XR1000 | 1,000 cc | 1983–1984 | Street model using XR racing cylinder head and other XR engine parts. |
| XL, Evolution | 883 cc, 1,100 cc (1986–1987), 1,200 cc (1988–) |
1986– | The first year of the new Sportster to have the Evolution overhead-valve engine, alloy heads, (known to many as the "Evo") |
| XL883N, Iron | 883 cc | 2009– | A "baby" version of the popular 1,200 cc Nightster, it comes with more black and cast wheels. |
Read more about this topic: List Of Harley-Davidson Motorcycles
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—Chinese proverb.
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Holds his dear Psyche sweet intranc’t
After her wandring labours long,
Till free consent the gods among
Make her his eternal Bride,
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Two blissful twins are to be born,
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—John Milton (1608–1674)