The refinements to the RM250 include; Improvements to the primary compression ratio. Carbon fibre reed valves. A reshaped reed valve intake areas and reshaped pipe. And, an upgraded ignition map, all of which are designed to produce smoother torque at middle rpm.
| Overall length: | 2170mm (85.4in) |
| Overall width: | 830mm (32.7in) |
| Overall height: | 1280mm (50.4in) |
| Wheelbase: | 1465mm (57.7in) |
| Seat height: | 950mm (37.4in) |
| Dry Mass: | 96kg (211.6lbs) |
| Fuel capacity: | 8.0litres (1.8gallons) |
| Engine capacity: | 249cc |
| Engine: | 2-stroke, liquid cooled |
| Bore: | 66.4 mm x 72.0 mm |
| Compression ratio: | 8.6/10.4:1 (Ex. valve open/Ex. valve close) |
| Lubrication: | Fuel/oil premixture of 30 : 1 |
| Ignition: | Digital CDI |
| Fuel system: | Keihn PWK38S, single |
| Transmission: | 5-speed constant mesh |
| Drive: | Chain |
| Front suspension: | Showa telescopic forks, pnuematic / coil spring, oil damped |
| Rear suspension: | Swingarm, link type. SHOWA piggyback resevoir shock |
| Front brakes: | Disc |
| Rear brakes: | Disc |
| Front tyres: | 80/100-21 51M |
| Rear tyres: | 110/90-19 62M |