| MODEL | HONDA NSR 250R-SP 1989 |
| Year | 1989 |
| Engine Type | Two stroke, 90° V-twin, reed valve, exhaust valve |
| Displacement / Capacity | 249 cc / 15.2 cu in |
| Bore X Stroke | 54 x 54.5 mm |
| Compression Ratio | 7.3:1 |
| Cooling System | Liquid cooled |
| Max Power | 32.8 kW / 45 hp @ 9500 rpm |
| Max Torque | 35 Nm / 25.8 lb-ft @ 8500 rpm |
| Ignition | PGM-CDI |
| Induction | TA20 carburettors |
| Start System | Kick |
| TRANSMISSION SPECS | |
| Lubrication | Separate pump (engine), splash (transmission) |
| Gear Box | 6-speed, constant mesh |
| Clutch | Dry multi-plate |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | Aluminium tube type |
| Front Suspension | 41 mm telescopic fork, adjustable preload and rebound damping |
| Rear Suspension | Pro-Link single gas/oil shock, adjustable preload, compression and rebound damping |
| Front Brakes | 2x discs, 2-piston calipers |
| Rear Brakes | Single disc, 1-piston caliper |
| DIMENSION SPECS | |
| Overall Length | 1980 mm / 77.9 in |
| Overall Width | 650 mm / 25.5 in |
| Overall Height | 1060 mm / 41.7 in |
| Seat Height | 790 mm / 31.1 in |
| Wheelbase | 1345 mm / 52.9 in |
| Ground Clearance | 135 mm / 5.3 in |
| Dry Weight | 131 kg / 288.8 lbs |
| Wet Weight | 149 kg / 328.4 lbs |
| WHEEL SPECS | |
| Front Tyre | 110/70-17 53H |
| Rear Tyre | 150/60R18 67H |
| FUEL SYSTEM | |
| Fuel Capacity | 16 Litres / 4.2 US gal |
| Fuel Consumption | — |
| Top Speed | — |
The 1989 SP (MC18 R6k) built on the updated 1989 NSR250R with magnesium wheels, a dry multi-plate clutch and fully adjustable suspension at both ends. These changes made it the go-to base for production racing. Engine output and dimensions were otherwise the same as the standard bike.
