2025 YAMAHA YZ 125 Monster Energy Edition

Your Race Starts Now

Bring the braaap in iconic Monster Energy colors with the competition bred YZ125 Monster Energy Yamaha Racing Edition.

Key Features New for 2025

Competition-Inspired Monster Energy® Styling

Roll like a factory pro with this striking Monster Energy® Yamaha Racing Edition. Inspired by Yamaha's factory race team, iconic blue and black Monster Energy® livery combines with the YZ125's sleek, aggressive bodywork for a competition-ready look and feel.

Top Features

Powerful Two-Stroke YZ125 Engine

Yamaha's advanced, liquid-cooled 125cc two-stroke engine provides impressive acceleration, thrilling mid- to high-rpm power, along with supreme usability.

Class-Leading KYB® Suspension

The YZ125's renowned suspension performance offers unmatched levels of control, capability and comfort by way of the fully adjustable 48mm inverted KYB® front fork, including a new hand-adjustable clicker for easier compression adjustment, and a fully adjustable KYB® rear shock featuring reduced-friction Kashima Coat™ internals. It all adds up to class-defining suspension and handling characteristics.

Rider-Friendly Chassis

Lightweight finely tuned chassis means nimble handling, more control and less rider fatigue"”the ideal platform for advancing skills and gaining confidence.

High Performance Braking System

High performance front and rear brake setup offers exceptional braking power and feel.

Confidence-Inspiring Ergonomics

A carefully considered ergonomic design includes a flatter seat, narrow fuel tank, smoothly integrated body panels and slim shroud width to enable greater freedom of movement forward and back, allowing the rider to easily shift body weight for increased control and confidence.

Perfect for Aspiring Motocrossers

A pure motocross machine, the light, nimble, competition-ready YZ125 is the perfect choice for riders stepping up from the 85cc class.

Engine

Powerful Two-Stroke YZ125 Engine

Yamaha's advanced, liquid-cooled 125cc two-stroke engine provides impressive acceleration, thrilling mid- to high-rpm power, along with supreme usability.

Yamaha Power Valve System

Patented Yamaha Power Valve System (YPVS™) combines crisp, hard-hitting bottom-end acceleration with strong mid-range and top-end.

Precise Fueling & Ignition Timing

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.

Close-Ratio Transmission

Close-ratio six-speed transmission has wider transmission gear tooth width and optimized gear ratios for maximum performance.

Digital Ignition

Digital CDI system delivers precise spark and monitors engine speed to ensure optimal timing for faster, stronger response during hard acceleration.

New High-Capacity Radiator

A new high-capacity radiator with dark louvers delivers improved cooling efficiency and an aggressive look.

Chassis/Suspension

Lightweight Frame

Race-proven, highly developed aluminum semi-double cradle frame is engineered to provide just the right amount of strength and flex for the perfect balance of stability and cornering performance. Removable aluminum rear subframe is constructed of square-section tubing for reduced weight.

Rider-Friendly Chassis

Lightweight finely tuned chassis means nimble handling, more control and less rider fatigue"”the ideal platform for advancing skills and gaining confidence.

Industry-Leading KYB® Fork

The Speed Sensitive System 48mm inverted KYB® fork includes a leaf spring in the mid-speed valve for more precise damping and increased performance and comfort, while offering up 11.8 inches of travel. New for 2025, the fork now includes a hand-adjustable knob for quick, toolless compression adjustments.

Advanced KYB® Shock

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.

High Performance Braking System

The high performance braking system features a 270mm front rotor, 240mm rear rotor, large front pistons and rigid calipers, all combining to provide exceptional braking power and feel.

Confidence-Inspiring Ergonomics

A carefully considered ergonomic design includes a flatter seat, narrow fuel tank, smoothly integrated body panels and slim shroud width to enable greater freedom of movement forward and back, allowing the rider to easily shift body weight for increased control and confidence.

Race-Ready Tires

Premium Bridgestone® Battlecross X20 tires offer strong cornering grip and race-developed performance.

Additional Features

Race-Ready Features

Complete with an aluminum handlebar, two-position adjustable handlebar clamp, new water-resistant PVC handle bar pad, wide foot pegs, gripper seat, adjustable clutch lever with works-style cable adjuster and lightweight rear sprocket design, the YZ125 is competition-ready straight out of the crate.

Specifications

Engine

Engine Type - 125cc liquid-cooled 2-stroke; reed-valve inducted

Bore x Stroke - 54.0mm x 54.5mm

Compression Ratio - 8.2~10.1:1

Fuel Delivery - Hitachi Astemo® Keihin PWK38S carburetor

Transmission - Constant-mesh 6-speed; multiplate wet clutch

Final Drive - Chain

Fuel Capacity - 1.8 gal

Chassis

Suspension/Front - KYB® Speed-Sensitive System inverted fork; fully adjustable, 11.8-in travel

Suspension/Rear - KYB® single shock; fully adjustable, 12.4-in travel

Brakes/Front - Hydraulic disc, 270mm

Brakes/Rear - Hydraulic disc, 240mm

Tires/Front - 80/100-21 Bridgestone® Battlecross X20F

Tires/Rear - 100/90-19 Bridgestone® Battlecross X20

Dimensions

LxWxH - 84.1 in x 32.5 in x 51.0 in

Seat Height - 38.6 in

Wheelbase - 56.9 in

Rake (Caster Angle) - 26°

Trail - 4.3 in

Max. Ground Clearance - 14.4 in

Fuel Capacity - 1.8 gal

Wet Weight*** - 209 lbs

Other

Warranty - 30 Day (Limited Factory Warranty)