Yamaha RD125 (1977)

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The Yamaha RD 125, manufactured in 1977, has a two-stroke parallel twin engine with a capacity of 124cc/7.6 cu-in. It has a cooling system of air cooled and a compression ratio of 6.8:1. The induction of the motorcycle features 2x 18mm Teikei carburetors and ignition of battery coil. The motorcycle has a kick starting mechanism with a maximum power of 17 hp/12.4 kW at 8500 rpm and maximum torque of 1.3 kgf-m at 8000 rpm. It has a 5-speed transmission with final drive as a chain gear ratio of (1) 34.52 (2) 19.67 (3) 14.11 (4) 11.34 (5) 9.11.

The Yamaha RD 125 has a steel tube frame with front suspension featuring 28 mm telescopic forks and rear suspension consisting of dual rear shock pre-load adjustable. The motorcycle has front brakes of single 240mm disc and rear brakes of 130mm drum. The front and rear tyres of the motorcycle are 2.75-18 and 3.00-18 respectively. The wheelbase is 1245 mm/49.0 in and seat height is 749mm/29.5 inches. The wet weight of the motorcycle is 115kg/255lbs with a fuel capacity of 11.5 litres/3.04 US gallons.

Technical specifications:

Make Model: Yamaha RD 125

Year: 1977


Engine: Two stroke, parallel twin
Capacity: 124 cc / 7.6 cu-in
Bore x Stroke: 43 43 mm
Cooling System: Air cooled
Compression Ratio: 6.8:1
Induction: 2x 18mm Teikei carburetors
Ignition: Battery coil
Starting: Kick
Max Power: 17 hp / 12.4 kW @ 8500 rpm
Max Torque: 1.3 kgf-m @ 8000 rpm
Transmission: 5 Speed
Final Drive: Chain
Gear Ratio: (1) 34.52 (2) 19.67 (3) 14.11 (4) 11.34 (5) 9.11
Frame: steel tube engine used as a stressed member
Front Suspension: 28 mm telescopic forks

Rear Suspension: Dual rear shock pre-load adjustable
Front Brakes: Single240mm disc
Rear Brakes: 130 mm Drum
Front Tyre: 2.75-18
Rear Tyre: 3.00-18
Wheelbase: 1245 mm / 49.0 in
Seat Height: 749 mm / 29.5 in
Wet Weight: 115 kg / 255 lbs
Fuel Capacity: 11.5 Litres / 3.04 US gal

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