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2021 Yamaha YZ125X
2021 Yamaha YZ125X

Specs

General Information

Manufacturer
Yamaha
Yamaha
Model Year
2021
2021
Model
YZ125X
YZ125X
Model Code
YZ125XM
YZ125XM
Color
Team Yamaha Blue
Team Yamaha Blue

Brakes/Wheels/Tires

Brakes

Front - Hydraulic disc, 270 mm

Rear - Hydraulic disc, 245 mm

Front - Hydraulic disc, 270 mm

Rear - Hydraulic disc, 245 mm

Tires

Front - 90 / 90-21 Dunlop® AT81F

Rear - 110 / 90-18 Dunlop® AT81

Front - 90 / 90-21 Dunlop® AT81F

Rear - 110 / 90-18 Dunlop® AT81

Dimensions

Length
84.3 in.
84.3 in.
Height
50.6 in.
50.6 in.
Width
32.5 in.
32.5 in.
Weight
Wet - 209 lb.
Wet - 209 lb.
Ground Clearance
Maximum - 13.8 in.
Maximum - 13.8 in.
Wheelbase
57.3 in.
57.3 in.
Seat Height
37.6 in.
37.6 in.

Drivetrain

Transmission
6-speed
6-speed
Final Drive
Chain
Chain

Engine

Engine
2-stroke; reed-valve inducted
2-stroke; reed-valve inducted
Cooling
Liquid
Liquid
Displacement
125 cc
125 cc
Bore x Stroke
54 x 54.5 mm
54 x 54.5 mm
Compression Ratio
7.4 ~ 8.8:1
7.4 ~ 8.8:1
Clutch
Multiplate wet
Multiplate wet
Carburetion
Carburetor
Carburetor
Ignition
CDI
CDI
Fuel Capacity
2.1 gal.
2.1 gal.

Operational

Front Suspension

KYB® spring-type fork with speed sensitive damping; fully adjustable

Travel - 11.8 in.

KYB® spring-type fork with speed sensitive damping; fully adjustable

Travel - 11.8 in.

Rear Suspension

KYB® single shock; fully adjustable

Travel - 12.4 in.

KYB® single shock; fully adjustable

Travel - 12.4 in.

Rake
Caster angle - 26.8°
Caster angle - 26.8°
Trail
4.6 in.
4.6 in.

Other

Warranty
30 Day (Limited Factory)
30 Day (Limited Factory)

Features

Chassis / Suspension

  • INDUSTRY-LEADING KYB® FORK: The industry-leading, fully adjustable KYB® spring-type fork with speed-sensitive damping uses piston speed to control the damping force for super-precise handling and a smooth ride. With minimal wasted stroke or abrupt shocks for the rider, this bike is tuned for the demands of cross country racing.
  • SMOOTH KYB® SHOCK: Rear, fully adjustable KYB® shock features 12.4 inches of travel, separate adjusters for high- and low-speed compression damping and a full lock oil rebound system for increased comfort, control and fantastic rear wheel traction in off-road conditions.
  • YZ-BASED FRAME: A carefully engineered aluminum frame and swingarm give the YZ125X the famous handling that's proven by the championship-winning YZ motocrosser on tracks around the world.
  • LIGHTWEIGHT SUBFRAME: Removable aluminum rear subframe is constructed of square-section tubing for reduced weight.
  • 270MM FRONT BRAKE: Large 270mm front disc brake coupled with high-performance pad material offer outstanding machine control and performance, with exceptional stopping power and controllability.
  • ENDURO-SPECIFIC WHEELS AND TIRES: Cross country-spec Dunlop® Geomax® AT81 front and rear tires are ready to head straight to the races while the 18-inch rear tire has a taller sidewall to improve comfort and reduce pinch flats.

Engine

  • GNCC®-TUNED YZ125 POWER: Based on the legendary 125cc liquid-cooled, reed-valve-inducted YZ two-stroke engine, the YZ125X utilizes a revised compression ratio, Yamaha Power Valve System (YPVS) timing and a model-specific CDI unit—all focused on creating broad power delivery that suits off-road terrain and a wide range of rider skill levels.
  • REVISED POWER VALVE: The YZ125X features the patented Yamaha Power Valve System—with broader opening timing compared to the motocross version for smoother power—to create a smooth balance of power across the rev range.
  • NARROW EXHAUST PIPE: The compact exhaust expansion chamber provides both horizontal and vertical clearance on tight, technical trails while still providing excellent exhaust efficiency.
  • RACING INTAKE SYSTEM: Specially designed carbon fiber reed-valve petals improve throttle response and engine performance across the entire rpm range.
  • SIX-SPEED TRANSMISSION: Smooth-shifting six-speed transmission ensures proper gearing from tight woods to wide-open fire roads to maximize the power delivery from the two-stroke powerplant.
  • YZ125 COOLING SYSTEM: Large-capacity radiator features a large cooling core with protective louvers for maximum cooling efficiency and durability in racing conditions.
  • DIGITAL IGNITION: Specifically tuned for the needs of the YZ125X, the digital CDI ignition system delivers precise spark for faster, stronger response anywhere in the powerband.

Other Features

  • 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 comes equipped with off-road focused tires with the 18” rear wheel, larger rear sprocket, a side stand, sealed O-ring chain and a reserve fuel petcock.

Top Features

  • TWO-STROKE AGILITY: TUNED FOR CROSS COUNTRY AND HARE SCRAMBLES RACING: The YZ125X™ is optimized for the unique demands of Hare Scrambles and GNCC® racing. The YPVS™-equipped 125cc two-stroke engine is combined with a six-speed transmission for the ultimate cross country power plant.
  • LIGHTWEIGHT ALUMINUM FRAME: Ultra-lightweight YZ125™-spec frame features carefully engineered combination of aluminum castings, forgings and extrusions for the perfect balance of rigidity and flex. The industry-leading fully adjustable, the KYB® speed sensitive spring-type suspension is tested and tuned specifically for the needs of cross country racers.
  • GNCC®-SPECIFIC FEATURES: 18-inch rear wheel, sealed O-ring chain, off-road focused tires and suspension settings, a standard side stand and fuel tank petcock with reserve position are perfect for GNCC racing.
  • INDUSTRY-LEADING SUSPENSION: Yamaha’s renowned spring-type KYB® fork is matched with a long-travel shock, both fully adjustable and tuned for the demands of cross country racing.
  • RACING STYLE AND ERGONOMICS: The YZ125X carries the racing heritage of the YZ motocrosser with its aggressive styling from the front fender to the rear brake protector. Complete with an aluminum tapered handlebar, YZ-F-style foot pegs, gripper seat, and Dunlop® tires, the YZ125X is ready to race out of the crate.

Chassis / Suspension

  • INDUSTRY-LEADING KYB® FORK: The industry-leading, fully adjustable KYB® spring-type fork with speed-sensitive damping uses piston speed to control the damping force for super-precise handling and a smooth ride. With minimal wasted stroke or abrupt shocks for the rider, this bike is tuned for the demands of cross country racing.
  • SMOOTH KYB® SHOCK: Rear, fully adjustable KYB® shock features 12.4 inches of travel, separate adjusters for high- and low-speed compression damping and a full lock oil rebound system for increased comfort, control and fantastic rear wheel traction in off-road conditions.
  • YZ-BASED FRAME: A carefully engineered aluminum frame and swingarm give the YZ125X the famous handling that's proven by the championship-winning YZ motocrosser on tracks around the world.
  • LIGHTWEIGHT SUBFRAME: Removable aluminum rear subframe is constructed of square-section tubing for reduced weight.
  • 270MM FRONT BRAKE: Large 270mm front disc brake coupled with high-performance pad material offer outstanding machine control and performance, with exceptional stopping power and controllability.
  • ENDURO-SPECIFIC WHEELS AND TIRES: Cross country-spec Dunlop® Geomax® AT81 front and rear tires are ready to head straight to the races while the 18-inch rear tire has a taller sidewall to improve comfort and reduce pinch flats.

Engine

  • GNCC®-TUNED YZ125 POWER: Based on the legendary 125cc liquid-cooled, reed-valve-inducted YZ two-stroke engine, the YZ125X utilizes a revised compression ratio, Yamaha Power Valve System (YPVS) timing and a model-specific CDI unit—all focused on creating broad power delivery that suits off-road terrain and a wide range of rider skill levels.
  • REVISED POWER VALVE: The YZ125X features the patented Yamaha Power Valve System—with broader opening timing compared to the motocross version for smoother power—to create a smooth balance of power across the rev range.
  • NARROW EXHAUST PIPE: The compact exhaust expansion chamber provides both horizontal and vertical clearance on tight, technical trails while still providing excellent exhaust efficiency.
  • RACING INTAKE SYSTEM: Specially designed carbon fiber reed-valve petals improve throttle response and engine performance across the entire rpm range.
  • SIX-SPEED TRANSMISSION: Smooth-shifting six-speed transmission ensures proper gearing from tight woods to wide-open fire roads to maximize the power delivery from the two-stroke powerplant.
  • YZ125 COOLING SYSTEM: Large-capacity radiator features a large cooling core with protective louvers for maximum cooling efficiency and durability in racing conditions.
  • DIGITAL IGNITION: Specifically tuned for the needs of the YZ125X, the digital CDI ignition system delivers precise spark for faster, stronger response anywhere in the powerband.

Other Features

  • 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 comes equipped with off-road focused tires with the 18” rear wheel, larger rear sprocket, a side stand, sealed O-ring chain and a reserve fuel petcock.

Top Features

  • TWO-STROKE AGILITY: TUNED FOR CROSS COUNTRY AND HARE SCRAMBLES RACING: The YZ125X™ is optimized for the unique demands of Hare Scrambles and GNCC® racing. The YPVS™-equipped 125cc two-stroke engine is combined with a six-speed transmission for the ultimate cross country power plant.
  • LIGHTWEIGHT ALUMINUM FRAME: Ultra-lightweight YZ125™-spec frame features carefully engineered combination of aluminum castings, forgings and extrusions for the perfect balance of rigidity and flex. The industry-leading fully adjustable, the KYB® speed sensitive spring-type suspension is tested and tuned specifically for the needs of cross country racers.
  • GNCC®-SPECIFIC FEATURES: 18-inch rear wheel, sealed O-ring chain, off-road focused tires and suspension settings, a standard side stand and fuel tank petcock with reserve position are perfect for GNCC racing.
  • INDUSTRY-LEADING SUSPENSION: Yamaha’s renowned spring-type KYB® fork is matched with a long-travel shock, both fully adjustable and tuned for the demands of cross country racing.
  • RACING STYLE AND ERGONOMICS: The YZ125X carries the racing heritage of the YZ motocrosser with its aggressive styling from the front fender to the rear brake protector. Complete with an aluminum tapered handlebar, YZ-F-style foot pegs, gripper seat, and Dunlop® tires, the YZ125X is ready to race out of the crate.