The 2011 Yamaha YZ125 Dirt Bike

The award-winning, light, nimble Yamaha two-stroke is more fun than should be allowed on two wheels!

124cc, liquid-cooled, 2-stroke, reed-valve inducted

Super light weight, instantaneous power, less expensive to maintain, and reduced noise. These are just a few of the reasons why many customers still love a 2011 Yamaha YZ 2-stroke.

So you’re looking for super lightweight, instantaneous power, nominal maintenance costs and reduced noise levels… you must love two-strokes.

These are just a few of the reasons why so many customers love a two-stroke YZ.

Like its big brother, the YZ125 has many features found on our championship-winning four-strokes.

Class-leading power flows from a liquid-cooled, 124cc crankcase-reed-valve-inducted two-stroke that feeds through a close-ratio six-speed transmission, for outstanding acceleration and corner-exiting power.

The aluminum semi-double-cradle frame is made from a unique mix of castings, forgings and extrusions that provide stiffness and flexibility where needed.

Excellent handling, good ride quality, superior stability and responsive cornering performance; YZ125.

Key Features:

  • A light aluminum frame housing an amazingly light and compact engine results in an awesome power-to-weight ratio.
  • The YZ125 is ready to race out of the crate, complete with a ProTaper® aluminum handlebar, titanium footpegs and gripper seat.
  • A pure motocross machine, the light and nimble YZ125 is the perfect choice for riders stepping up from the 85cc class.
  • Owning a Yamaha 2-stroke is less expensive to maintain.


  • Reed-valve spacer improves acceleration across the entire powerband.
  • Amazingly compact 124cc reed-valve-inducted two-stroke helps produce an awesome power-to-weight ratio.
  • Patented YPVS® power-valve system combines crisp, hard-hitting bottom-end acceleration with strong midrange and eye-opening top-end.
  • 38mm Mikuni® TMX carburetor gives excellent throttle response and serious horsepower.
  • Six-speed, close-ratio transmission optimizes gear ratios for maximum performance.
  • Digital CDI ignition system delivers precise spark and monitors engine speed to ensure optimal timing for faster, stronger response during hard acceleration.
  • Large-capacity radiator features a 10-row core with four louvers to deliver maximum cooling efficiency at all performance levels.
  • Primary kickstarting ensures easy restarts in any gear.
  • Trick, works-style clutch lever features race-spec barrel adjuster for on-the-fly adjustability.


  • YZ250F-style front-brake caliper and wave-style front and rear discs minimize unsprung weight and provide excellent stopping power.
  • A carefully engineered, advanced aluminum frame and swingarm give the YZ125 the best handling in its class.
  • Speed-Sensitive System 48mm KYB® fork; damping force is controlled by piston speed which provides a smoother, more precise ride.
  • Removable aluminum rear subframe is constructed of square-section tubing for reduced weight.
  • Rear, fully adjustable KYB® shock features a super-light titanium shock spring and reduced-friction Kashima coating of 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 add up to fantastic rear wheel control and a sweet ride.
  • Tapered rear wheel spacers ease sliding the rear wheel into place for quicker tire changes.
  • Premium Dunlop® knobbies offer race-spec traction and wear.

Additional Features:

  • Special-design “gripper” type seat and fuel tank, forward-canted steering crown and low ProTaper® handlebar all help create greater freedom of movement and more comfortable ergonomics for riders.
  • Wide, cleated, folding titanium footpegs are lightweight and provide excellent comfort, grip and ground clearance.
  • Use of light box-head bolts throughout the chassis eases maintenance while reducing weight for increased performance.
  • Premium drive chain has gold-colored plates for outstanding looks.
  • Wide-diameter fuel tank cap for easier refueling.
  • Repackable exhaust silencer.
  • Durable, comfortable handlebar grips.

Speed-sensitive system inverted fork; fully adjustable, 11.8-in travel

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