YZ125

2019 Yamaha YZ125 Technical Analysis & Specification Breakdown

Engineered by Yamaha for the cross - motocross motorcycle segment, the 2019 Yamaha YZ125 features a 125 cc (7.6 cu in) liquid-cooled single cylinder, two-stroke configuration. In factory specification, peak output is rated at 33.5 HP (24.5 kW), transferring power to the rear wheel through a 6-speed gearbox and chain final drive. With a specific output of 268 HP per liter, the engine character is placing it firmly in high-revving supersport territory where top-end breathing dominates.

On the scales, the YZ125 measures 93.9 kg (207 lbs) wet (curb), translating to a power-to-weight ratio of 0.36 HP/kg (2.8 kg per horsepower). Rider ergonomics and chassis geometry center around a 975 mm (38.4 in) seat height — reflecting a long-travel chassis stance that favors ground clearance and off-pavement control, combined with a 1,443 mm (56.8 in) wheelbase engineered for balanced agility and highway composure. The 8-liter (2.1 US gal) fuel tank supports practical everyday commuting and weekend road stints, while factory top speed is listed at 96 km/h (60 mph).

Within MotoLibrary's Yamaha archive, this model family spans 19 indexed model years from 2008 to 2026, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.