Yamaha RD125 (1973)

The Yamaha RD125 is a motorcycle made in 1973 and features a two-stroke, parallel twin engine with a capacity of 124 cc. Its cooling system is air cooled, and it has an ignition system consisting of a battery coil. The starting process is kick-starting, and it has a power output of 17 hp at 8500 rpm and a maximum torque of 1.3 kgf-m at 8000 rpm. The transmission is a five-speed model with a chain final drive, and the gear ratios range from 34.52 to 9.11. The frame is a steel tube with the engine used as a stressed member. It has front suspension consisting of 28 mm telescopic forks and rear suspension with dual rear shock pre-load adjustability. The front and rear brakes are drum models with sizes of 150 mm and 130 mm, respectively. The bike’s front and rear wheels have tire sizes of 2.75-18 and 3.00-18, and the wheelbase measures 1245 mm with a seat height of 749 mm. The bike weighs 115 kg with a fuel capacity of 11.5 liters, and its top speed is 81 mph, with a standing 1/4 mile time of 18.2 seconds.

---

Technical specifications:

Make Model: Yamaha RD 125

Year: 1973

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: 150 mm Drum

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

Standing 1/4 Mile: 18.2 sec

Top Speed: 81 mph