Yamaha DT 250 (1979-80)

The Yamaha DT 250 motorcycle was produced from 1979-1980 and had a two-stroke, single cylinder engine with a capacity of 246 cc. Its compression ratio was 6.8:1 and it had a single 28mm Mikuni VM28SS induction with an autolube lubrication system. The ignition was external-rotor magneto with CDI and a six-volt battery, and the bike had a kick start. The maximum power output was 17 hp at 6000 rpm and the maximum torque was 20.7 Nm at 5500 rpm. The transmission had five speeds and the final drive was a chain. The frame was a double-downtube, full-cradle, mild-steel frame with a tubular-section, mild-steel swing arm. The front suspension had an oil-damped, coil-spring fork with forward-mounted axle and provided 195 mm of wheel travel, while the rear suspension had a DeCarbon-type, nitrogen-charged mono-shock producing 152 mm of wheel travel. The front and rear brakes were conical hubs with drum brakes and the bike had a 135 mm rake. Its width was 870 mm and its wheelbase was 1420 mm. The seat height was 856 mm and the ground clearance was 255 mm, with a dry weight of 122 kg and wet weight of 131 kg. The fuel capacity was 8.5 liters.

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Technical specifications:

Make Model: Yamaha DT 250

Year: 1979 – 80

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