Yamaha RD125 (1977)

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