The Yamaha DT 250 produced in 1981 is a two-stroke, single-cylinder motorcycle with a 246cc engine capacity. It has a compression ratio of 6.8:1 and autolube lubrication. The ignition system is an external-rotor magneto with CDI and a six-volt battery. The maximum power output is 17 horsepower and 12.6 kW, and the maximum torque output is 20.7 Nm at 5500 rpm. The motorcycle has a 5-speed transmission and a chain final drive. The frame is composed of mild-steel and has a double-downtube, full-cradle design. The front suspension is oil-damped, coil-spring fork with forward-mounted axle, and the rear suspension is a DeCarbon-type nitrogen-charged mono-shock. The front and rear brakes are conical hub with drum brake, and the tires are 3.00-21 and 4.00-18 on the front and rear respectively. The motorcycle has a 1420mm wheelbase, 856mm seat height, and a dry weight of 122kg and wet weight of 131kg. Its fuel capacity is 8.5 liters or 2.2 gallons.
Technical specifications:
Make Model: Yamaha DT 250
| Year | 1981 |
|---|---|
| Engine | Two stroke, single cylinder |
| Capacity | 246 cc / 15.0 cu-in |
| Bore x Stroke | 70 x 64 mm |
| Cooling System | Air cooled |
| Compression Ratio | 6.8:1 |
| Lubrication | Autolube |
| Induction | Single 28mm Mikuni VM28SS |
| Ignition | External-rotor magneto; CDI; six-volt battery |
| Starting | Kick |
| Max Power | 17 hp 12.6 kW @ 6000 rpm |
| Max Torque | 20.7 Nm / 15.3 lb-ft @ 5500 rpm |
| Transmission | 5 Speed |
| Final Drive | Chain |
| Gear Ratio | 1st 33/13, 2.538 / 2nd 34/19, 1.789 3rd 26/20, 1.300 / 4th 23/23, 1.000 /5th 20/26, 0.769 |
| Frame | Double-downtube, full-cradle, mild-steel frame; tubular-section, mild-steel swing arm |
| Front Suspension | Oil-damped, coil-spring fork with forward-mounted axle and |
| Front Wheel Travel | 195 mm / 7.6 in |
| Rear Suspension | DeCarbon-type, nitrogen-charged mono-shock producing |
| Rear Wheel Travel | 152 mm / 5.9 in |
| Front Brakes | Conical hub with drum brake |
| Rear Brakes | Conical hub with rod-actuated drum brake |
| Front Tyre | 3.00-21 |
| Rear Tyre | 4.00-18 |
| Rake | 135 mm / 5.3 in |
| Dimensions | Width 870 / 34.2 in |
| Wheelbase | 1420 mm / 55.9 in |
| Seat Height | 856 mm / 33.7 in |
| Ground Clearance | 255 mm / 10.0 in |
| Dry Weight | 122 kg / 269 lbs |
| Wet Weight | 131 kg / 290 lbs |
| Fuel Capacity | 8.5 Litres / 2.2 gal |
