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2017 Yamaha YZ125

  • 2017 Yamaha YZ125
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2017 Yamaha YZ125

Product Description

Light, powerful, KYB® Speed-Sensitive forks and Dunlop MX52® tires, plus new 270mm front brake disc for ultimate 125 2-stroke.

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.
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.
Engine Features
  • Two-Stroke Power: Amazingly compact 124cc reed-valve-inducted two-stroke helps produce an awesome power-to-weight ratio.
  • 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 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.
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.
  • Engine Type: 125cc liquid-cooled 2-stroke; reed-valve inducted
  • Bore x Stroke: 54.0mm x 54.5mm
  • Compression Ratio: 8.6~10.7:1
  • Fuel Delivery: Mikuni® TMX 38
  • Ignition: CDI
  • Transmission: Constant-mesh 6-speed; multiplate wet clutch
  • Final Drive: Chain
  • 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, 245mm
  • Tires / Front: 80/100-21 Dunlop® MX52
  • Tires / Rear: 100/90-19 Dunlop® MX52
  • L x W x H: 84.1 in. x 32.6 in. x 51.0 in.
  • Seat Height: 38.4 in.
  • Wheelbase: 56.8 in.
  • Rake (Caster Angle): 26.0 deg.
  • Trail: 4.3 in.
  • Ground Clearance: 14.4 in.
  • Fuel Capacity: 2.1 gal.
  • Wet Weight: 207 lb.
  • Warranty: 30 Day (Limited Factory Warranty)



Engine Type 2-stroke; reed-valve inducted
Displacement 125cc
Bore and Stroke 54.0mm x 54.5mm
Cooling Liquid
Compression Ratio 8.6~10.7:1
Fuel System Mikuni® TMX 38
Ignition CDI
Front Suspension KYB® Speed-Sensitive System inverted fork; fully adjustable, 11.8-in travel
Front Brakes Hydraulic disc, 270mm
Front Tire 80/100-21 Dunlop® MX52
Rear Suspension KYB® single shock; fully adjustable, 12.4-in travel
Rear Brakes Hydraulic disc, 245mm
Rear Tire 100/90-19 Dunlop® MX52
Dry Weight Curb Weight: 207 lb.
Fuel Capacity 2.1 gal.
Wheelbase 56.8 in.
Ground Clearance 14.4 in.
Seat Height 38.4 in.
Trail 4.3 in.
Rake 26.0 deg.
Transmission Constant-mesh 6-speed; multiplate wet clutch
Final Drive Chain
Colors Team Yamaha Blue
Warranty 30 Day (Limited Factory Warranty)

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