SR 500 S

1990 Yamaha SR 500 S Technical Analysis & Specification Breakdown

Engineered by Yamaha for the classic motorcycle segment, the 1990 Yamaha SR 500 S relies on a 499 cc (30.5 cu in) air-cooled single cylinder, four-stroke powerplant. In factory specification, peak output is rated at 27 HP (19.7 kW) at 6,200 rpm, transferring power to the rear wheel through a 5-speed gearbox and chain final drive. With a specific output of 54.1 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 SR 500 S measures 167 kg (368 lbs) wet (curb), translating to a power-to-weight ratio of 0.16 HP/kg (6.19 kg per horsepower). The 14-liter (3.7 US gal) fuel tank supports practical everyday commuting and weekend road stints, while factory top speed is listed at 134 km/h (83 mph).

Within MotoLibrary's Yamaha archive, this model family spans 4 indexed model years from 1982 to 1991, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.