• Home
• Yamaha
• YZ125X
• 2025

Yamaha YZ125X 2025 Parts & Accessories

First introduced in 2020, the Yamaha YZ125X is a lightweight off-road and cross-country competition motorcycle specifically engineered to bring Yamaha’s legendary 125 cc two-stroke agility into woods, GNCC, and hare scramble racing. Based heavily on the YZ125 motocross platform, the YZ125X features key off-road optimizations, including a revised combustion chamber volume, modified YPVS power valve timing, specialized ECU ignition mapping, and cross-country suspension valving. Complemented by an 18-inch rear wheel, a reserve fuel petcock, a sealed O-ring chain, and a side stand, it delivers light, tractable, and accessible power for technical trail conditions.

• 125 cc liquid-cooled reed-valve 2-stroke single-cylinder engine with off-road tuned YPVS (Yamaha Power Valve System) producing approx. 33–36 HP @ 11,500 RPM
• 38 mm Keihin PWK38S flat-slide carburetor with Throttle Position Sensor (TPS) and digital CDI ignition
• Aluminum bilateral beam frame with lightweight detachable rear subframe
• 48 mm KYB Speed-Sensitive System (SSS) inverted coil-spring front forks with cross-country specific valving providing 300 mm (11.8 in) wheel travel
• Fully adjustable KYB rear monoshock with Link Monocross linkage providing 315 mm (12.4 in) wheel travel
• 270 mm hydraulic wave-type single front disc brake and 240 mm hydraulic wave-type single rear disc brake
• 6-speed close-ratio manual transmission with heavy-duty multi-plate wet clutch
• 21-inch front (80/100-21) and 18-inch rear (110/90-18) spoked aluminum Excel rims with Dunlop Geomax AT81 tires
• 96 kg (212 lbs) wet weight with a 7.0-litre (1.8 US gal) fuel tank capacity