Honda NR
The Honda NR (New Racing) was a V-four motorcycle series started by Honda in 1979 with the 500cc NR500 Grand Prix racer that used oval pistons. This was followed during the 1980s by a 750cc endurance racer version known as the NR750. The oval piston concept allowed for eight valves per cylinder which generated more power due to the increased air/fuel mixture and throughout compression. In 1992 Honda produced around 300 street versions of a 750cc model, the NR (often referred to as the NR750), with a 90-degree V angle. Whereas the NR500 had used an oval piston with straight sides, the road going NR750 used an elliptical piston with curved long sides. The bike became the most expensive production bike at the time when it was selling for $50,000 and with the rarity, nowadays they rarely change hands.
| Manufacturer | Honda |
|---|---|
| Engine | 747.7 cc (45.63 cu in) 4-stroke 90° V4 oval-piston, DOHC , 8 Valve per cylinder Individual gear driven cam banks per cylinder. |
| Bore / stroke | 101.2 mm / 50.6 mm × 42 mm (4.0 in / 2.0 in × 1.7 in) |
| Compression ratio | 11.7:1 |
| Top speed | 159.8 mph (257.2 km/h) |
| Power | 115.8 hp (86.4 kW) @ 14,500 rpm |
| Torque | 66 N⋅m (49 lbf⋅ft) @ 11,000 rpm |
| Transmission | 6 Speed |
| Wheelbase | 1,435 mm (56.5 in) |
| Dimensions | L: 2,150 mm (84.6 in) W: 700 mm (27.6 in) H: 1,090 mm (42.9 in) |
| Seat height | 785 mm (30.9 in) |
| Weight | 223 kg (492 lb) (dry) 244 kg (538 lb) (wet) |
| Fuel capacity | 17 L (3.7 imp gal; 4.5 US gal) |