RS 100

1975 Yamaha RS 100 Technical Analysis & Specification Breakdown

Built around Yamaha's classic motorcycle platform, the 1975 Yamaha RS 100 features a 97 cc (5.9 cu in) air-cooled single cylinder, two-stroke configuration. In factory specification, peak output is rated at 10.5 HP (7.7 kW) at 7,500 rpm while maximum torque reaches 9 Nm (6.6 lb-ft) at 7,000 rpm, transferring power to the rear wheel through a 5-speed gearbox and chain final drive. With a specific output of 108.2 HP per liter and a 500 rpm working window between peak torque (7,000 rpm) and peak power (7,500 rpm), the engine character is reflecting a performance-oriented street tune that balances strong mid-range pull with an energetic top-end rush.

On the scales, the RS 100 measures 105 kg (231 lbs) wet (curb), translating to a power-to-weight ratio of 0.1 HP/kg (10 kg per horsepower). Rider ergonomics and chassis geometry center around a 775 mm (30.5 in) seat height — offering a neutral standover height that accommodates most average-inseam riders without sacrificing cornering clearance, combined with a 1,240 mm (48.8 in) wheelbase engineered for quick, flickable steering geometry. The 9-liter (2.4 US gal) fuel tank supports practical everyday commuting and weekend road stints, while factory top speed is listed at 104 km/h (65 mph).

Within MotoLibrary's Yamaha archive, this model family spans 5 indexed model years from 1975 to 1981, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.