Yamaha RD125 (1978)

The Yamaha RD125 was a motorcycle produced in 1978. It had a 124cc, air-cooled, two-stroke parallel twin engine with a compression ratio of 6.8:1. The bike used two 18mm Teikei carburetors, and the ignition was battery coil. The kick-started engine produced 17 horsepower at 8500 RPM and a maximum torque of 1.3 kgf-m at 8000 RPM. The transmission was five-speed and its gears had ratios ranging from 34.52 to 9.11. The bike’s frame was built with steel tubes, and the engine was used as a stressed member. It had 28mm telescopic forks for the front suspension and dual rear shock pre-load that could be adjusted. The front disc brake measured 240mm, whereas the rear drum measured 130mm. The bike rolled on 2.75-18 front and 3.00-18 rear tires with a wheelbase spanning 1245mm, and a seat height of 749mm. The bike weighed 115kg and had an 11.5-liter fuel tank.

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Technical specifications:

Make Model: Yamaha RD 125

Year: 1978

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