| Year | 1986 |
| Bore x Stroke | 84 x 61.3 mm |
| Capacity | 339 cc / 26.7 cu-in |
| Compression Ratio | 9.5;1 |
| Consumption Average | 56 mpg |
| Cooling System | Air cooled |
| Dimensions | 860 mm / 33.9 in |
| Engine | Four stroke, single cylinder, SOHC, 4 valve, RFVC radial valve |
| Final Drive | Chain |
| Front Brakes | Single disc |
| Front Suspension | 41mm Air adjustable forks |
| Front Tyre | 3.00 -21 |
| Front Wheel Travel | 280 mm / 11.0 in |
| Fuel Capacity | 11 Litres / 2.9 US gal |
| Ignition | CDI |
| Induction | 2x 26mm Keihin carburetor |
| Lubrication | Wet sump |
| Max Power | 22.4 hp / 16.7 KW @ 7500 |
| Max Torque | 28.3 Nm / 20.9 lb·ft @ 6500 rpm |
| Rake | 30.5° |
| Rear Brakes | Drum |
| Rear Suspension | Single gas shocks, fully adjustable |
| Rear Tyre | 4.60 -17 |
| Rear Wheel Travel | 270 mm / 10.6 in |
| Seat Height | 920 mm / 36.2 in |
| Standing ¼ Mile | 14.9 sec / 83.6 mph |
| Starting | Kick |
| Top Speed | 86 mph |
| Trail | 120 mm / 4.7 in |
| Transmission | 6 Speed |
| Wet-Weight | 137 kg / 302 lbs |
| Wheelbase | 1410 mm / 55.6 in |
| XL250R ........ | ....... 285 lb. |
| XL350R ........ | ....... 290 lb. |
| XL600R........ | .......315 lb. |
| XR250R........ | ....... 249 lb. |
| XR350R........ | ....... 265 lb. |
| XR500R........ | ....... 288 lb. |
