2025 Yamaha YZ125X

The YZ125X sets the standard for light, fast two-stroke fun! The perfect entry into the world of XC and enduro competition, this two-stroke trailblazer combines thrilling performance and ultimate reliability for all your wins....

Overview

The YZ125X sets the standard for light, fast two-stroke fun! The perfect entry into the world of XC and enduro competition, this two-stroke trailblazer combines thrilling performance and ultimate reliability for all your wins.

Specifications

Model
YZ125X
Category Name
Motorcycles
Year
2025
Sale Type
New
Manufacturer
Yamaha
Quantity
1
Manufacturer Qty
0
Color
Team Yamaha Blue

highlights

2025 Yamaha YZ125XPOWERFUL 125 CC ENGINE

The YZ125's advanced, liquid-cooled 125cc two-stroke engine provides impressive acceleration, thrilling mid- to high-rpm power, along with supreme usability.

2025 Yamaha YZ125XLIGHTWEIGHT ALUMINUM FRAME

Ultra-lightweight YZ125-spec aluminum semi-double cradle frame is engineered to provide the perfect balance of rigidity and flex for competition-ready handling character and composure. 

2025 Yamaha YZ125XCROSS COUNTRY- SPECIFIC FEATURES

Cross country focused suspension setup and tires, 18-inch rear wheel, sealed O-ring chain, standard side stand and fuel tank petcock with reserve position all combine to make the perfect GNCC® racer. 

 

key features

  • Liquid-cooled 125cc two-stroke engine
  • High-precision Hitachi Astemo® Keihin PWK38S carburetor features a power jet, throttle position sensor and 3D-map-controlled CDI unit for precise ignition timing
  • Braking system features large front pistons, rigid caliper and a 270mm front rotor 
  • Model-specific CDI unit 
  • Racing intake system 
  • Ultra-lightweight YZ125-spec frame 
  • Industry-leading, XC-specific adjustable KYB suspension 
  • Smooth shifting, 6-speed, close ratio transmission

 

features & benefits

KEY FEATURES

  • Powerful New 125cc Two-Stroke Engine
  • Improved Fueling
  • New Brake System
  • Revised Suspension Damping
  • Improved Rider Ergonomics
  • Bold New YZ Styling
  • 18-inch rear wheel and large rear sprocket
  • Adjustable, tapered aluminum handlebar

ENGINE

  • Powerful New 125cc Two-Stroke Engine
    • 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.
  • Improved Fueling
    • 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.
  • Ceramic composite cylinder bore is a linerless design with the ceramic coating sprayed directly on the aluminum block.
    • reduced weight (no heavy iron liner)
    • reduced friction
    • extended cylinder life
    • excellent heat dissipation for consistent power delivery
  • Specially designed combustion chamber achieves a more complete burn at higher rpm.
    • class-leading power
  • Lightweight, flat-top forged aluminum piston.
    • excellent durability
    • light weight means fast engine response
    • matches combustion chamber design for maximum power delivery
  • Lightweight, ball-bearing-style crank.
    • lightweight design for fast throttle response
    • friction-reducing crank seals
  • Compact crankcases.
    • lightweight design
    • helps centralize mass
  • Quick-access, magnesium outer (sub) clutch cover.
    • lightweight design
    • speeds clutch access
  • Close-ratio, 6-speed transmission uses optimized gear ratios.
    • 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
  • Yamaha's patented YPVS system.
    • 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.
  • 6-petal, carbon fibre reed design.
    • for stronger high-rpm performance with greater over-rev capacity
  • CD (capacitor discharge) ignition system.
    • delivers a precise spark for fast, sure starts
    • ensures optimal timing at all rpm for fast, strong response
  • High-capacity, washable, dual-stage, foam air filter.
    • excellent filtering qualities
    • reusable filter reduces maintenance costs
  • Large-capacity, dual radiators feature 10-row cores.
    • maximum cooling efficiency
  • Lightweight exhaust system features a re-packable aluminum silencer which allows the rider/tuner to maintain the correct amount of back pressure for maximum engine performance while reducing noise.
  • Works-style clutch lever and race-spec barrel adjuster.
    • easy lever pull
    • for on-the-fly clutch adjustments

CHASSIS/SUSPENSION

  • Lightweight, aluminum, semi-double-cradle frame.
    • 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
  • Removable rear subframe.
    • constructed of square-section, lightweight aluminum
    • detachable design allows easy access when servicing rear suspension components
  • Lightweight, tapered design aluminum swingarm.
    • produced by "hydro forming", a forming method that uses high pressure water to form shapes
    • excellent rear wheel traction and control
    • lightweight design
  • Cast aluminum upper and forged lower triple clamps.
    • strong yet lightweight
    • fast, agile handling
  • Adjustable handlebar mounts.
    • handlebar can be moved 10 mm rearward if desired
  • "Speed Sensitive System" 48 mm, adjustable, inverted, "twin chamber" KYB fork. Front wheel travel is 300 mm (11.8").
    • 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
  • Fork also features a Transfer Control Valve (TCV).
    • 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"
  • Large wrap-around plastic fork protectors.
    • provide excellent protection from dirt, mud and stone chips
    • self-supporting design reduces friction for smoother stroke
  • Monocross link rear suspension features a fully adjustable, KYB piggyback shock which provides 315 mm (12.4") of wheel travel.
    • 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.
  • 270 mm floating front disc brake with Nissin twin piston caliper.
    • "wave" style rotor (disc) reduces weight, improves cooling (more surface area) and improves styling
    • braking performance is excellent with great feel and control
  • "Shorty" front brake lever is adjustable for various hand sizes.
  • 245 mm rear disc brake with single piston caliper.
    • 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
  • Rugged, plastic rear caliper and lower rear disc protectors / guards.
  • Sun Star-brand rear sprocket.
    • increases the contact area between the sprocket and chain rollers
    • reduces the load on the chain and increases service life of chain and sprocket
  • Lightweight, D.I.D. 21" front and 18" rear rims and premium Dunlop tires.
    • provide excellent durability
    • reduces unsprung weight for optimal suspension performance and handling
  • Flat-design seat features multi-density foam.
    • 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
  • Seat, handlebar and fuel tank ergonomics provide excellent freedom of movement for the rider.

DETAILS

  • Cross Country Ergonomics
    • 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.
  • Cross Country Features
    • 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.
  • Slim design, modern aggressive bodywork allows easy rider movements
  • Lightweight YZ250F/450F-based wide footpegs provide excellent grip & ground clearance
  • Heavy-duty 520 gold anodized "O" ring chain
  • Rugged chain guide helps prevent the chain from de-railing & also helps protect the rear sprocket
  • Serrated rear brake lever & folding shift lever tip
  • Stainless steel, inner clutch cable provides excellent strength, smooth action & long life
  • E10 friendly fuel system components

 

engine

ENGINE
2-stroke, liquid-cooled, reed-valve, single
FINAL_DRIVE
Chain
DISPLACEMENT
125 cc
TRANSMISSION
Constant mesh, 6-speed
FUEL_DELIVERY
Hitachi Astemo® Keihin PWK38S
BORE_AND_STROKE
54.0 x 54.5 mm
COMPRESSION_RATIO
7.8~10.2:1
IGNITION_/_STARTING
CDI / Kick

chassis

TIRES_(REAR)
110/100-18
BRAKES_(REAR)
240 mm disc / single piston caliper
TIRES_(FRONT)
80/100-21 Bridgestone® Battlecross X20F
BRAKES_(FRONT)
270 mm floating disc / twin piston caliper
SUSPENSION_(REAR)
Fully adjustable KYB link Monocross / 315 mm (12.4") travel
SUSPENSION_(FRONT)
Fully adjustable 48 mm KYB inverted fork / 300 mm (11.8") travel

critical data

WIDTH
825 mm (32.5")
HEIGHT
1,290 mm (50.8")
LENGTH
2,154 mm (84.8")
COLOUR(S)
Team Yamaha Blue
WHEELBASE
1,455 mm (57.3")
WET_WEIGHT
96 kg (212 lb)
SEAT_HEIGHT
970 mm (38.2")
FUEL_CAPACITY
8 litres (1.8 imp. gallons)
GROUND_CLEARANCE
356 mm (14")
Location

Quick Links

main Shop Map & HOURS

Monday 9:00am - 6:00pm

TUESDAY 9:00am - 6:00pm

WEDNESDAY 9:00am - 6:00pm

THURSDAY 9:00am - 6:00pm

FRIDAY 9:00am - 8:00pm

Saturday: 9:00am - 5:00pm

Sunday: Gone Riding

dirt bike Shop Map & HOURS

Monday 9:00am - 6:00pm

TUESDAY 9:00am - 6:00pm

WEDNESDAY 9:00am - 6:00pm

THURSDAY 9:00am - 6:00pm

FRIDAY 9:00am - 6:00pm

Saturday: 9:00am - 1:00pm

Sunday: Gone Riding

boat Shop Map & HOURS

Monday 8:00am - 5:00pm

TUESDAY 8:00am - 5:00pm

WEDNESDAY 8:00am - 5:00pm

THURSDAY 8:00am - 5:00pm

FRIDAY 8:00am - 5:00pm

Saturday: Gone Boating

Sunday: Gone Boating

›
Search 
Shop Online
0 $0.00 CAD
Parts Lookup Parts Finder
Parts Catalogues Parts Catalogues
xFacebook
Visit Our Instagram
705.733.2280