Chassis / Suspension

• LIGHTWEIGHT FRAME: Race-proven, highly developed aluminum semi-double cradle frame is engineered to provide the perfect balance of rigidity and flex for competition-ready handling character and composure. Removable aluminum rear subframe is constructed of square-section tubing for reduced weight.
• INDUSTRY-LEADING KYB® FORK: Tuned for the demands of cross country racing, the Speed Sensitive System 48mm inverted KYB® fork includes a leaf spring in the mid-speed valve for more precise damping and increased comfort, while offering up 11.8 inches of travel. Additionally, a adopted scraper between the dust and oil seal improves reliability in cross country conditions.
• ADVANCED KYB® SHOCK: Revised fully adjustable KYB® rear shock features reduced-friction Kashima Coat™ internals, separate adjusters for high- and low-speed compression damping, a full lock oil rebound system for increased comfort, and 12.4 inches of travel. It all adds up to fantastic rear wheel control and class-leading capability.
• BRAKE SYSTEM: An updated high performance braking system features larger front pistons, a more rigid caliper and a redesigned 270mm front rotor with a 30% increase in pad contact area, all combining to provide exceptional braking power and feel. The redesigned rear rotor maintains the same braking power while dropping outer diameter from 245mm to 240mm, reducing unsprung weight with no compromise on performance.
• PREMIUM EXCEL® WHEELS & DUNLOP® TIRES: Slick blue Excel® rims provide exceptional durability and a premium look. They come wrapped in sized high performance Dunlop® Geomax MX33 tires for improved cornering traction, stability and feel.

Engine

• POWERFUL 125CC TWO-STROKE ENGINE: The YZ125X's two-stroke engine represents an increase in power and usability over the 2022 model. Nearly every functional part of the engine is from the cylinder body, cylinder head, piston, piston pin, connecting rod, crankcase and expansion chamber, to a revised cylinder port shape and updated cylinder port timing. It's a change that is immediately apparent at the first crack of the throttle and throughout the entire rpm range.
• TUNED FOR GNCC® COMPETITION: The YZ125X utilizes a revised compression ratio, revised YPVS™ timing and a model-specific digital CDI unit compared to its motocross sibling—all focused on creating a broad, usable power delivery specifically suited to cross country and enduro-style competition.
• AIR INTAKE DESIGN: Updated intake design allows for a straighter, more efficient draw of air into the intake tract.
• IMPROVED FUELING: High-precision Hitachi Astemo® Keihin PWK38S carburetor features a power jet, throttle position sensor and 3D-map-controlled CDI unit for precise ignition timing. The result is clean, crisp throttle response, superior rideability and excellent over-rev character.
• REVISED CLOSE-RATIO TRANSMISSION: Revised close-ratio six-speed transmission has wider transmission gear tooth width and optimized gear ratios for maximum performance.
• NARROW EXHAUST PIPE: The compact exhaust expansion chamber provides both horizontal and vertical clearance on tight, technical trails while still providing excellent exhaust efficiency.
• HIGH-CAPACITY RADIATOR: Large-capacity radiator with dark louvers deliver an aggressive look and maximum cooling efficiency for demanding racing conditions.

New For 2023

• POWERFUL 125CC TWO-STROKE ENGINEA: completely redesigned liquid-cooled 125cc two-stroke engine boasts improved usability and increased mid- and top-end power over the 2022 model for a thrilling new level of performance.
• IMPROVED FUELING: High-precision Hitachi Astemo® Keihin PWK38S carburetor features a power jet, throttle position sensor and 3D-map-controlled CDI unit for precise ignition timing. The result is clean, crisp throttle response, superior rideability and excellent over-rev character.
• BRAKE SYSTEM: To match increased engine performance, an updated high performance braking system features larger front pistons, a more rigid caliper and a redesigned 270mm front rotor with a 30% increase in pad contact area, all combining to provide exceptional braking power and feel. The redesigned rear rotor maintains the same braking power while dropping outer diameter from 245mm to 240mm, reducing unsprung weight with no compromise on performance.
• REVISED SUSPENSION DAMPING: Taking the YZ125X's class-defining suspension and handling characteristics to the next level, front fork internals and revised suspension settings further improve bump absorption, cornering performance and comfort to better withstand the grueling demands of cross country and enduro-style racing.
• IMPROVED RIDER ERGONOMICS: To increase rider confidence in challenging cross country conditions, smoothly integrated body panels, more narrow fuel tank design, slimmer shroud width and flatter seat all combine to enable greater freedom of movement forward and back, allowing the rider to easily shift body weight for better control.
• BOLD YZ STYLING: Along with the slimmer, more aggressive bodywork, a front and rear fender design and radiator shrouds all integrate with a bold graphics scheme to highlight the YZ family pedigree. Premium Yamaha graphics are now embedded to provide excellent durability and scratch resistance.

Other Features

• CROSS COUNTRY ERGONOMICS: A racy "gripper"-type seat and narrow fuel tank combined with a tapered aluminum handlebar and adjustable mounts create greater freedom of movement and more comfortable ergonomics for riders.
• CROSS COUNTRY FEATURES: The YZ125X is focused on enduro competition with an 18-inch rear wheel, larger rear sprocket, side stand, sealed O-ring chain, reserve fuel petcock, and adopted scraper between the fork's dust and oil seal, all adding up to exceptional cross country performance.

Top Features

• TWO-STROKE POWER: TUNED FOR ENDURO RACING: The YZ125X is optimized for the unique demands of Hare Scrambles and GNCC® racing. The powerful Yamaha Power Valve System (YPVS™)-equipped 125cc two-stroke engine is mated to a six-speed transmission for the ultimate cross country powerplant.
• LIGHTWEIGHT ALUMINUM FRAME: Ultra-lightweight YZ125-spec aluminum semi-double cradle frame is engineered to provide the perfect balance of rigidity and flex for competition-ready handling character and composure.
• INDUSTRY-LEADING SUSPENSION: Yamaha’s renowned Speed Sensitive System KYB® spring-type front fork is matched with a high performance KYB® long-travel rear shock, both fully adjustable and tuned for the specific demands of cross country racing.
• GNCC®-SPECIFIC FEATURES: Cross country focused suspension setup, optimized YPVS™ settings, lightweight Excel® wheels paired with Dunlop® Geomax MX33 tires, sealed O-ring chain, standard side stand and fuel tank petcock with reserve position all combine to make the perfect GNCC® racer.