RD 125 DX

1978 Yamaha RD 125 DX Technical Analysis & Specification Breakdown

At the heart of the 1978 Yamaha RD 125 DX sport motorcycle, Yamaha relies on a 125 cc (7.6 cu in) 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.

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.