| MODEL | HONDA NT 650 BROS MKI 1987 - 1989 |
| Year | 1987 - 1989 |
| Engine Type | Four stroke, 52° V-twin, SOHC, 3 valves per cylinder |
| Displacement / Capacity | 647 cc / 39.4 cu in |
| Bore X Stroke | 79 x 66 mm |
| Compression Ratio | 9.2:1 |
| Cooling System | Liquid cooled |
| Max Power | 40.9 kW / 56.1 hp @ 7897 rpm |
| Max Torque | 56.9 Nm / 43 lb-ft @ 6053 rpm |
| Ignition | Digital transistorized |
| Induction | 2 x 36 mm equal pressure flat slide carburettors |
| Start System | Electric |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | 5 Speed |
| Clutch | Wet plate |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | — |
| Front Suspension | 41 mm telescopic forks |
| Rear Suspension | Pro-Arm single-sided swingarm, single shock, preload and rebound damping adjustment |
| Front Brakes | Single 316 mm disc, 2 piston caliper |
| Rear Brakes | Single 276 mm disc, 1 piston caliper |
| DIMENSION SPECS | |
| Overall Length | — |
| Overall Width | — |
| Overall Height | — |
| Seat Height | 773 mm / 30.6 in |
| Wheelbase | 1430 mm / 56.3 in |
| Ground Clearance | — |
| Dry Weight | 165 kg / 363.7 lbs |
| Wet Weight | 184.2 kg / 406 lbs |
| WHEEL SPECS | |
| Front Tyre | 110/80-17 |
| Rear Tyre | 150/70-17 |
| FUEL SYSTEM | |
| Fuel Capacity | 12 Litres / 3.2 US gal |
| Fuel Consumption | 46.6 mpg |
| Top Speed | 172 km/h / 107 mph |
The Bros 650 was Honda's Japanese-market naked sport twin. It used the 647 cc 52-degree V-twin from the NTV family, but with chain drive, a light aluminium box frame and a single-sided Pro-Arm swingarm. The same RC31 bike was sold in North America as the Hawk GT. This first series had a single front disc with a twin-piston caliper and a small 12-litre tank, making it a nimble, low-slung roadster rather than a tourer.
