YZF-R25

2019 Yamaha YZF-R25 Technical Analysis & Specification Breakdown

Engineered by Yamaha for the sport motorcycle segment, the 2019 Yamaha YZF-R25 relies on a 250 cc (15.3 cu in) liquid-cooled twin, four-stroke powerplant. In factory specification, peak output is rated at 35 HP (25.5 kW) at 12,000 rpm while maximum torque reaches 23.6 Nm (17.4 lb-ft) at 10,000 rpm, transferring power to the rear wheel through a 6-speed gearbox and chain final drive. With a specific output of 140 HP per liter and a 2,000 rpm working window between peak torque (10,000 rpm) and peak power (12,000 rpm), the engine character is placing it firmly in high-revving supersport territory where top-end breathing dominates.

On the scales, the YZF-R25 measures 167 kg (368 lbs) wet (curb), translating to a power-to-weight ratio of 0.21 HP/kg (4.77 kg per horsepower). Rider ergonomics and chassis geometry center around a 780 mm (30.7 in) seat height — offering a neutral standover height that accommodates most average-inseam riders without sacrificing cornering clearance, combined with a 1,380 mm (54.3 in) wheelbase engineered for quick, flickable steering geometry. The 14-liter (3.7 US gal) fuel tank supports practical everyday commuting and weekend road stints.

Within MotoLibrary's Yamaha archive, this model family spans 6 indexed model years from 2015 to 2021, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.