| MODEL | HONDA NSR 250R-SP 1990 |
| Year | 1990 |
| 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, air valve, semi-adjustable |
| Rear Suspension | Pro-Link single shock, gull-arm swingarm, non-adjustable |
| Front Brakes | 2x discs, 2-piston calipers |
| Rear Brakes | Single disc, 1-piston caliper |
| DIMENSION SPECS | |
| Overall Length | 1975 mm / 77.7 in |
| Overall Width | 655 mm / 25.7 in |
| Overall Height | 1060 mm / 41.7 in |
| Seat Height | 770 mm / 30.3 in |
| Wheelbase | 1345 mm / 52.9 in |
| Ground Clearance | 135 mm / 5.3 in |
| Dry Weight | 132 kg / 291.8 lbs |
| Wet Weight | 151 kg / 333 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 SP version of the new MC21 followed the standard model in April 1990. It added magnesium wheels front and rear, a dry clutch and race-team paintwork, and was aimed at riders entering Japan's SP racing class. The engine and frame were the same as the R.
