Yamaha DT125 (1980)

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The Yamaha DT 125MX is a two-stroke, single-cylinder, reed-valve motorcycle that was produced in 1980. It has a capacity of 123 cc and a compression ratio of 7.2:1. The bike uses a single 24 mm Mikuni induction and is powered by a flywheel magneto ignition system. The engine produces a maximum power of 14 hp at 6500 rpm and a maximum torque of 1.5 kgf-m at 6500 rpm. The six-speed transmission and chain final drive are designed for smooth shifting and efficient power delivery. The bike features telescopic forks front suspension and a monocross rear suspension that offer a comfortable ride. The front and rear brakes are drum type, and the front and rear wheels have a tire sizes of 2.75-21 and 3.50-18, respectively. The bike measures 2080 mm in length, 885 mm in width, and 1120 mm in height. The wheelbase is 1325 mm, the seat height is 855 mm, and the ground clearance is 265 mm. The dry weight of the bike is 96 kg, and the fuel capacity is 7 liters. The average fuel consumption is 79 mpg, and the bike has a top speed of 74 mph with a standing quarter-mile time of 19.9 seconds. Overall, the Yamaha DT 125MX is an excellent bike with great performance and a comfortable ride.

Technical specifications:

Make Model: Yamaha DT 125MX

Year: 1980


Engine: Two stroke, single cylinder, reed-valve
Capacity: 123 cc / 7.5 cu-in
Bore x Stroke: 56 50 mm
Cooling System: Air cooled
Compression Ratio: 7.2:1
Lubrication: Autolube
Oil Capacity: 0.9 Litres
Induction: Single 24 mm Mikuni
Ignition: Flywheel Magneto
Starting: Kick
Max Power: 14 hp / 10.3 kW @ 6500 rpm
Max Torque: 1.5 kgf-m / 15.2 Nm @ 6500 rpm
Clutch: Wet multiplate
Transmission: 6 speed
Final Drive: Chain

Front Suspension: Telescopic Forks
Front Wheel Travel: 160 mm / 6.2 in
Rear Suspension: Monocross
Rear Wheel Travel: 115 mm / 4.5 in
Front Brakes: Drum
Rear Brakes: Drum
Front Tyre: 2.75-21
Rear Tyre: 3.50-18
Dimensions: Length 2080 mm / 81.8 in Width 885 mm / 34.8 in Height 1120 mm / 41.0 in
Wheelbase: 1325 mm / 52.2 in
Seat Height: 855 mm / 33.6 in
Ground Clearance: 265 mm / 10.4 in
Dry Weight: 96 kg / 212 lbs
Fuel Capacity: 7 Litres / 1.58 gal
Consumption Average: 79 mpg
Standing 1/4 Mile: 19.9 sec
Top Speed: 74 mph

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