2021 Yamaha YZ125X

Chassis / Suspension

• INDUSTRY-LEADING KYB® FORK: The industry-leading, fully adjustable KYB® spring-type fork with speed-sensitive damping uses piston speed to control the damping force for super-precise handling and a smooth ride. With minimal wasted stroke or abrupt shocks for the rider, this bike is tuned for the demands of cross country racing.
• SMOOTH KYB® SHOCK: Rear, fully adjustable KYB® shock features 12.4 inches of travel, separate adjusters for high- and low-speed compression damping and a full lock oil rebound system for increased comfort, control and fantastic rear wheel traction in off-road conditions.
• YZ-BASED FRAME: A carefully engineered aluminum frame and swingarm give the YZ125X the famous handling that's proven by the championship-winning YZ motocrosser on tracks around the world.
• LIGHTWEIGHT SUBFRAME: Removable aluminum rear subframe is constructed of square-section tubing for reduced weight.
• 270MM FRONT BRAKE: Large 270mm front disc brake coupled with high-performance pad material offer outstanding machine control and performance, with exceptional stopping power and controllability.
• ENDURO-SPECIFIC WHEELS AND TIRES: Cross country-spec Dunlop® Geomax® AT81 front and rear tires are ready to head straight to the races while the 18-inch rear tire has a taller sidewall to improve comfort and reduce pinch flats.

Engine

• GNCC®-TUNED YZ125 POWER: Based on the legendary 125cc liquid-cooled, reed-valve-inducted YZ two-stroke engine, the YZ125X utilizes a revised compression ratio, Yamaha Power Valve System (YPVS) timing and a model-specific CDI unit—all focused on creating broad power delivery that suits off-road terrain and a wide range of rider skill levels.
• REVISED POWER VALVE: The YZ125X features the patented Yamaha Power Valve System—with broader opening timing compared to the motocross version for smoother power—to create a smooth balance of power across the rev range.
• NARROW EXHAUST PIPE: The compact exhaust expansion chamber provides both horizontal and vertical clearance on tight, technical trails while still providing excellent exhaust efficiency.
• RACING INTAKE SYSTEM: Specially designed carbon fiber reed-valve petals improve throttle response and engine performance across the entire rpm range.
• SIX-SPEED TRANSMISSION: Smooth-shifting six-speed transmission ensures proper gearing from tight woods to wide-open fire roads to maximize the power delivery from the two-stroke powerplant.
• YZ125 COOLING SYSTEM: Large-capacity radiator features a large cooling core with protective louvers for maximum cooling efficiency and durability in racing conditions.
• DIGITAL IGNITION: Specifically tuned for the needs of the YZ125X, the digital CDI ignition system delivers precise spark for faster, stronger response anywhere in the powerband.

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 comes equipped with off-road focused tires with the 18” rear wheel, larger rear sprocket, a side stand, sealed O-ring chain and a reserve fuel petcock.

Top Features

• TWO-STROKE AGILITY: TUNED FOR CROSS COUNTRY AND HARE SCRAMBLES RACING: The YZ125X™ is optimized for the unique demands of Hare Scrambles and GNCC® racing. The YPVS™-equipped 125cc two-stroke engine is combined with a six-speed transmission for the ultimate cross country power plant.
• LIGHTWEIGHT ALUMINUM FRAME: Ultra-lightweight YZ125™-spec frame features carefully engineered combination of aluminum castings, forgings and extrusions for the perfect balance of rigidity and flex. The industry-leading fully adjustable, the KYB® speed sensitive spring-type suspension is tested and tuned specifically for the needs of cross country racers.
• GNCC®-SPECIFIC FEATURES: 18-inch rear wheel, sealed O-ring chain, off-road focused tires and suspension settings, a standard side stand and fuel tank petcock with reserve position are perfect for GNCC racing.
• INDUSTRY-LEADING SUSPENSION: Yamaha’s renowned spring-type KYB® fork is matched with a long-travel shock, both fully adjustable and tuned for the demands of cross country racing.
• RACING STYLE AND ERGONOMICS: The YZ125X carries the racing heritage of the YZ motocrosser with its aggressive styling from the front fender to the rear brake protector. Complete with an aluminum tapered handlebar, YZ-F-style foot pegs, gripper seat, and Dunlop® tires, the YZ125X is ready to race out of the crate.