2026 Yamaha YZ250FX Base

2026 Yamaha YZ250FX

Based on the championship-winning YZ250F, a lightweight, compact chassis offers improved agility and handling in tight, technical terrain, along with better ergos and a more comfortable riding position for less fatigue over greater distances. The perfect weapon for carving up cross country courses.

Features may include:

The YZ250FX's liquid-cooled, DOHC 4-valve, fuel-injected powerplant features a forward-positioned straight downdraft intake with symmetrical intake ports, high-spec piston and aggressive cam profiles. Developed for victories in the highly competitive GNCC® and Hare Scrambles race series, the advanced four-stroke engine is known for its broad, useable powerband and strong low-end and mid-range torque. New for 2025, a more efficient intake path and revised ECU settings results in even more mid- to high-end power.

The high-spec forged piston features a bridge-box design for maximized strength with minimal weight. The piston, rings and DLC-coated piston pin, along with the offset cylinder configuration, all reduce friction loss. Intake ports, cam profiles, high-strength connecting rod, optimized crank and counter-balancer all work together to produce potent high-rpm power with user-friendly delivery and exceptional reliability. New for 2025, a redesigned cam chain improves durability.

The adjustable fuel injection system uses a 44mm Mikuni® throttle body, fed by a high-pressure electric fuel pump, to inject fuel through a 12-hole Denso® injector. This ensures optimum fuel atomization and air/fuel calibration for excellent rideability in a wide range of conditions.

The free-of-charge Yamaha Power Tuner App brings the power of the GYTR® Power Tuner to your iOS® or Android® device. Using wireless connectivity to talk to the bike’s onboard electronics system, the app allows owners to adjust air/fuel mixture and ignition timing to tune engine character for track conditions, log track set-up information, and monitor a range of data such as maintenance and system diagnosis, engine run time and more. For the 2025 YZ250FX, the app has been revised to be more user-friendly. New features include an intuitive “Simple Tuning” slide bar for engine mapping, new three-level Traction Control and updated Launch Control tuning, a new lap timer, along with helpful engine and suspension tuning guides.

A completely redesigned aluminum bilateral beam frame based on the class-dominating YZ250F motocross model provides just the right amount of strength and flex for the perfect balance of stability and cornering performance. The result is a better handling machine with lighter feel, more agility and increased traction, allowing the rider to charge corners with greater confidence.

Fully adjustable KYB® coil spring-type fork with speed-sensitive damping delivers exceptional balance between handling and bump absorption for championship-winning performance. New for 2025, the fork now includes hand-adjustable knob for easy compression adjustments, and revised suspension settings improve bump reaction to deliver an exceptional balance between cornering performance and high-speed stability. Linkage-type rear suspension features a KYB® shock with revised settings to provide less pitch on corner entry/exit for improved stability.