RD 125 DX

1976 Yamaha RD 125 DX Technical Analysis & Specification Breakdown

Engineered by Yamaha for the sport motorcycle segment, the 1976 Yamaha RD 125 DX relies on a 125 cc (7.6 cu in) air-cooled twin, two-stroke powerplant. In factory specification, peak output is rated at 17 HP (12.4 kW) at 9,500 rpm, transferring power to the rear wheel through a 5-speed gearbox and chain final drive. With a specific output of 136 HP per liter, the engine character is reflecting a performance-oriented street tune that balances strong mid-range pull with an energetic top-end rush.

On the scales, the RD 125 DX measures 117 kg (258 lbs) wet (curb), translating to a power-to-weight ratio of 0.15 HP/kg (6.88 kg per horsepower). The 11.5-liter (3 US gal) fuel tank supports practical everyday commuting and weekend road stints, while factory top speed is listed at 127 km/h (79 mph).

Within MotoLibrary's Yamaha archive, this model family spans 2 indexed model years from 1976 to 1978, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.