The 1978 Yamaha DT 125 is a two-stroke, single cylinder, reed-valve motorcycle with an engine capacity of 123cc. It has a 56.50mm bore and stroke with a compression ratio of 7.2:1. The bike is air-cooled with an autolube lubrication system using 1.2 liters of oil. The motorcycle utilizes a single 24mm Mikuni carburetor for induction and magneto ignition for starting. The DT 125 has a maximum power output of 13 horsepower at 7000 rpm and 9.8 lb-ft of torque at 6500 rpm.
The transmission is six-speed, and the final drive is a chain. The front suspension utilizes telescopic forks while the rear suspension is monocross. The bike has drum brakes on both the front and rear, and it comes with a 2.75-21 front tire and a 3.50-18 rear tire.
The Yamaha DT 125 has a length of 2095mm, a width of 866mm, and a height of 1120mm. The wheelbase measures 1404mm, and the seat height is 810mm with a ground clearance of 265mm. The dry weight of the motorcycle is 96kg, and the fuel capacity is 6.8 liters.
Overall, the Yamaha DT 125 is a relatively lightweight motorcycle with a simple design and a reliable engine, ideal for both on and off-road adventures. It remains a popular choice amongst vintage motorcycle enthusiasts.
Make Model: Yamaha DT 125
Year: 1978
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: 1.2 Litres / 1.76 qts
Induction: Single 24 mm Mikuni carburettor
Ignition: Magneto
Starting: Kick
Max Power: 13 hp / 9.5 kW @ 7000 rpm
Max Torque: 9.8 lb-ft @ 6,500 rpm
Transmission: 6 Speed
Final Drive: Chain
Front Suspension: Telescopic forks
Rear Suspension: Monocross
Front Brakes: Drum
Rear Brakes: Drum
Front Tyre: 2.75-21
Rear Tyre: 3.50-18
Dimensions: Length 2095 mm / 82.5 in Width 866 mm / 34.1 in Height 1120 mm / 44.1 in
Wheelbase: 1404 mm / 53.1 in
Seat Height: 810 mm / 31.8 in
Ground Clearance: 265 mm / 10.4 in
Dry Weight: 96 kg / 212 lbs
Fuel Capacity: 6.8 Litres / 1.8 gal
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