15J

1915 Harley-Davidson 15J Technical Analysis & Specification Breakdown

At the heart of the 1915 Harley-Davidson 15J allround motorcycle, Harley-Davidson pairs a 989 cc (60.4 cu in) engine architecture with road-focused gearing. In factory specification, peak output is rated at 17 HP (12.4 kW) at 3,200 rpm, transferring power to the rear wheel through chain final drive. With a specific output of 17.2 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 15J measures 136 kg (300 lbs) dry, translating to a power-to-weight ratio of 0.13 HP/kg (8 kg per horsepower).