Yamaha DT 250 (1981)

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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

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