25JD

1925 Harley-Davidson 25JD Technical Analysis & Specification Breakdown

At the heart of the 1925 Harley-Davidson 25JD allround motorcycle, Harley-Davidson utilizes a 1208 cc (73.7 cu in) engine layout. In factory specification, peak output is rated at 12 HP (8.8 kW), transferring power to the rear wheel through chain final drive. With a specific output of 9.9 HP per liter, the engine character is prioritizing low-RPM tractability, mechanical longevity and relaxed throttle response over peak redline numbers.

On the scales, the 25JD measures 166 kg (366 lbs) dry, translating to a power-to-weight ratio of 0.07 HP/kg (13.83 kg per horsepower).