2026 Yamaha YZ125X

• A 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.

• New 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.

• reduced weight (no heavy iron liner)
• reduced friction
• extended cylinder life
• excellent heat dissipation for consistent power delivery

• class-leading power

• excellent durability
• light weight means fast engine response
• matches combustion chamber design for maximum power delivery

• lightweight design for fast throttle response
• friction-reducing crank seals

• lightweight design
• helps centralize mass

• lightweight design
• speeds clutch access

• ratios are matched to engine output for maximum performance
• optimal hook-up for outstanding acceleration and corner-exiting power
• transmission features "involute splines" for smooth, positive shifting even under power

• features a slide (guillotine) type power valve that provides the benefits of both solid, low-rpm power delivery combined with a strong top-end punch. This system varies the exhaust port height and timing based on engine rpm.

• for stronger high-rpm performance with greater over-rev capacity

• delivers a precise spark for fast, sure starts
• ensures optimal timing at all rpm for fast, strong response

• excellent filtering qualities
• reusable filter reduces maintenance costs

• maximum cooling efficiency

• easy lever pull
• for on-the-fly clutch adjustments

• combines with compact engine to provide an awesome power to weight ratio
• obvious benefit of an aluminum frame is a significant weight reduction
• Yamaha maintains semi-double cradle design because it offers an excellent rigidity balance between lateral and torsional rigidity while offering controlled flex in the longitudinal plane
• result is a light aluminum frame, which provides excellent handling, good ride quality, excellent stability and responsive cornering performance

• constructed of square-section, lightweight aluminum
• detachable design allows easy access when servicing rear suspension components

• produced by "hydro forming", a forming method that uses high pressure water to form shapes
• excellent rear wheel traction and control
• lightweight design

• strong yet lightweight
• fast, agile handling

• handlebar can be moved 10 mm rearward if desired

• fork adjustments include: 20-way compression damping and 20-way rebound damping
• optional fork springs are available through Genuine Yamaha parts
• low-friction fork seals provide reduced stiction for a smoother stroke
• twin-chamber design means the damper unit is in a separate structure which prevents aerated fork oil from entering the inner damper assembly and degrading its damping abilities
• the inner damper is pressurized, it also eliminates bubbles forming in the oil
• "Speed Sensitive" design means the damping force is controlled by piston speed, not position in the fork

• TCV enhances damping from mid to full stroke and improves bottoming characteristics
• TCV offers more precise control throughout the full suspension stroke
• TCV is located on the upside of the spring and its function is controlled by piston speed, not piston position, hence the term "Speed Sensitive System fork"

• provide excellent protection from dirt, mud and stone chips
• self-supporting design reduces friction for smoother stroke

• features separate adjusters for high- and low-speed compression damping
• adjustments include: spring preload, 20-way rebound damping, 20-way low-speed compression damping and 2 turns of high speed compression damping
• 18 mm damper rod
• Kashima coating (friction reducer) is used in the shock body and sub tank to reduce friction and improve suspension performance
• piggyback shock utilizes a full rebound oil lock system for excellent suspension function and great ride quality.

• "wave" style rotor (disc) reduces weight, improves cooling (more surface area) and improves styling
• braking performance is excellent with great feel and control

• integrated master cylinder (fluid reservoir is integrated into the top of the master cylinder)
• "wave" style rotor (disc) reduces weight, improves cooling (more surface area) and improves styling
• strong stopping power with excellent feel and control

• increases the contact area between the sprocket and chain rollers
• reduces the load on the chain and increases service life of chain and sprocket

• provide excellent durability
• reduces unsprung weight for optimal suspension performance and handling

• provides good initial softness/comfort and then increases the firmness as more pressure is applied
• "pebble" finish on the top and side surfaces provides excellent rider grip and durability

DETAILS

• 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.

• 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 newly adopted scraper between the fork's dust and oil seal, all adding up to exceptional cross country performance.