SR400 B.S.R

2014 Yamaha SR400 B.S.R Technical Analysis & Specification Breakdown

Built around Yamaha's allround motorcycle platform, the 2014 Yamaha SR400 B.S.R pairs a 399 cc (24.4 cu in) air-cooled single cylinder, four-stroke architecture with road-focused gearing. In factory specification, peak output is rated at 22.9 HP (16.7 kW) at 6,500 rpm while maximum torque reaches 27.4 Nm (20.2 lb-ft) at 3,000 rpm, transferring power to the rear wheel through a 5-speed gearbox and chain final drive. With a specific output of 57.4 HP per liter and a 3,500 rpm working window between peak torque (3,000 rpm) and peak power (6,500 rpm), the engine character is prioritizing low-RPM tractability, mechanical longevity and relaxed throttle response over peak redline numbers.

On the scales, the SR400 B.S.R measures 174 kg (384 lbs) wet (curb), translating to a power-to-weight ratio of 0.13 HP/kg (7.6 kg per horsepower). Rider ergonomics and chassis geometry center around a 790 mm (31.1 in) seat height — offering a neutral standover height that accommodates most average-inseam riders without sacrificing cornering clearance, combined with a 1,410 mm (55.5 in) wheelbase engineered for quick, flickable steering geometry. The 12-liter (3.2 US gal) fuel tank supports practical everyday commuting and weekend road stints.