Harley-Davidson KR
The Harley-Davidson KR or KR750 was a 45.125 cu in (739.47 cc) displacement V-twin engine racing motorcycle made by Harley-Davidson from 1953 through 1969 for flat track racing. It was also used in road racing in the KRTT faired version. When the KR was first introduced, it dominated motorcycle racing in the United States. In 1970 it was replaced by the long-lived and US race-winning Harley-Davidson XR-750.
1963 KR at the Art of the Motorcycle Las Vegas | |
| Manufacturer | Harley-Davidson |
|---|---|
| Also called | KR750 |
| Production | 1953–1969 |
| Predecessor | Harley-Davidson WR |
| Successor | XR-750 |
| Class | Track racing |
| Engine | 45.125 cu in (739.47 cc) air cooled side valve 4-stroke 45° V-twin, dry sump |
| Bore / stroke | 2.745 in × 3.8125 in (69.72 mm × 96.84 mm) |
| Compression ratio | 6:1 or less |
| Top speed | 125 mph (201 km/h) |
| Power | 50–57 hp (37–43 kW) @ 6,000–7,000 rpm |
| Transmission | 4-speed, chain |
| Suspension | Front: Hydraulic fork Rear: swingarm |
| Brakes | none |
| Weight | 320 lb (150 kg) (dry) |
| Related | Model K |
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