| Year | 1989 |
| Bore x Stroke | 54 x 54.5 mm |
| Capacity | 249 c / 15.2 cu-in |
| Clutch | Multi-plate, coil spring |
| Compression Ratio | 7.3 : 1 |
| Cooling System | Liquid cooled |
| Dimensions | Length 1980 mm / 77.9 in Width 650 mm / 25.5 in Height 1060 mm / 41.7 in |
| Dry Weight | 131 kg / 288.8 lbs |
| Engine | Two stroke, 90°V-twin cylinder, reed valve/exhaust valve |
| Final Drive | Chain |
| Frame | Aluminum tube type frame |
| Front Brakes | 2x discs 2 piston calipers |
| Front Suspension | 41mm Telescopic air valve semi-adjustable |
| Front Tyre | 110/70-17 53 H |
| Fuel Capacity | 16 Litres / 4.2 US gal |
| Gear Ratio | 1st: 2.642 / 2nd: 1.800 / 3rd: 1.380 / 4th: 1.125 / 5th: 1.000 / 6th: 0.916 |
| Ground Clearance | 135 mm / 5.3 in |
| Ignition | PGM-CDI |
| Induction | TA20 Carburetor Type |
| Lubrication | Seperate Pump (engine) splash type (transmission) |
| Max Power | 45 hp / 32.8 kW @ 9500 rpm |
| Max Torque | 35 Nm / 25.8 ft-lb @ 8500 rpm |
| Rake | 23°15’ |
| Rear Brakes | Single disc 1 piston caliper |
| Rear Suspension | Rear: Pro-Link Single shock swingarm non-adjustable |
| Rear Tyre | 150/60-R18 67 H |
| Review | Type I / Type II / Technical / nsr250.net |
| Seat Height | 790 mm / 31.1 in |
| Starting | Kick |
| Trail | 87 mm / 3.4 in |
| Transmission | Constant Mesh 6-speed |
| Wet Weight | 149 kg / 328.4 lbs |
| Wheelbase | 1345 mm / 52.9 in |
