2017 Yamaha YZ125

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POUND FOR POUND, NOTHING'S MORE FUN

Light, powerful, KYB® Speed-Sensitive forks and Dunlop MX52® tires, plus new 270 mm front brake disc for ultimate 125 two-stroke.

Additional Features

  • RACE-READY FEATURES: The YZ125 is ready to race out of the crate, complete with an aluminum handlebar, 2-position adjustable handlebar clamp, wide foot pegs, gripper seat and adjustable clutch lever with works-style cable adjuster.

Chassis / Suspension

  • NEW 270MM FRONT BRAKE: New 270mm front brake system is a huge 20mm larger than the disc fitted to the 2016 YZ125 and uses an all-new pad material for exceptional stopping power and braking control.
  • ALUMINUM FRAME: A carefully engineered, advanced aluminum frame and swingarm give the YZ125 the best handling in its class.
  • LIGHTWEIGHT SUBFRAME: Removable aluminum rear subframe is constructed of square-section tubing for reduced weight.
  • INDUSTRY-LEADING FORK: Speed-Sensitive System 48mm KYB® fork; damping force is controlled by piston speed which provides a smoother, more precise ride with 11.8 inches of travel.
  • ADVANCED KYB® SHOCK: Rear, fully adjustable KYB® shock features reduced-friction Kashima Coat™ internals, 12.4 inches of travel, separate adjusters for high- and low-speed compression damping, and a full lock oil rebound system for increased comfort. All adding up to fantastic rear wheel control and a sweet ride.
  • RACE-READY TIRES: Premium Dunlop® knobbies offer race-spec traction and wear.

Engine

  • TWO-STROKE POWER: New 270mm front disc brake (up from 250mm) also features a new brake pad material for exceptional stopping power and control for aggressive corner entries.
  • RACE-DEVELOPED INTAKE: Reed-valve spacer improves acceleration across the entire powerband.
  • YAMAHA POWER VALVE SYSTEM: Patented YPVS™ combines crisp, hard-hitting bottom-end acceleration with strong midrange and eye-opening top-end.
  • CLOSE-RATIO TRANSMISSION: Six-speed, close-ratio transmission optimizes 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.
  • HIGH-CAPACITY RADIATOR: Large-capacity radiator features a 10-row core with four louvers to deliver maximum cooling efficiency at all performance levels.

New for 2017

  • NEW FRONT BRAKE: New 270mm front disc brake (up from 250mm) also features a new brake pad material for exceptional stopping power and control for aggressive corner entries.

Top Features

  • MODERN STYLING: Modern, aggressive styling, including front fender, front number plate, radiator shrouds, side number plates, air box, rear fender, fork guards, as well as the rear brake disc protector, rear brake caliper protector and wider foot pegs—just like the 4-strokes.
  • LIGHTWEIGHT FRAME: A light aluminum frame housing a patented YPVS™-equipped ripper of an engine results in an awesome power-to-weight ratio.
  • RACE-READY FEATURES: The YZ125 is ready to race out of the crate, complete with an aluminum handlebar, titanium foot pegs and gripper seat.
  • IDEAL BALANCE: A pure motocross machine, the light and nimble YZ125 is the perfect choice for riders stepping up from the 85cc class.
  • RIDER-FRIENDLY CHASSIS: Ultra light weight means nimble handling with less fatigue.
  • NEW 270MM FRONT BRAKE: Larger 270mm front disc brake coupled with new pad material offers outstanding machine control and performance, with exceptional stopping power and controllability.

General Information

Manufacturer Yamaha
Model Year 2017
Model YZ125
Model Code YZ125H2
Color Team Yamaha Blue

Brakes/Wheels/Tires

Brakes

Front - 270 mm hydraulic single disc

Rear - 245 mm hydraulic single disc

Tires

Front - 80/100-21 Dunlop® MX52

Rear - 100/90-19 Dunlop® MX52

Dimensions

Length 84.1 in.
Height 51 in.
Width 32.6 in.
Weight Wet - 207 lbs.
Ground Clearance 14.4 in.
Wheelbase 56.8 in.
Seat Height 38.4 in.

Drivetrain

Transmission Constant-mesh; 6-speed
Final Drive Chain

Engine

Engine Reed-valve inducted, 2-stroke
Displacement 125cc
Bore x Stroke 54 x 54.5 mm
Compression Ratio 8.6 ~ 10.7:1
Carburetion Mikuni® TMX 38
Fuel Capacity 2.1 gal.
Ignition CDI
Clutch Multi-plate wet
Cooling Liquid

Operational

Suspension

Front - KYB® Speed-Sensitive System inverted fork; fully adjustable; 11.8 in. travel

Rear - KYB® single shock; fully adjustable; 12.4 in. travel

Rake 26.0°
Trail 4.3 in.