YZ125X 2021 Yamaha Dirt Bike Review Specs Price


The new YZ125X 2021 Yamaha Dirt Bike light two-stroke is the peak of performance on the racecourse, and it’s the ideal step up to a full-size Cross Country bike.

YZ125X 2021 Yamaha Dirt Bike

YZ125X 2021 Yamaha Dirt Bike – Features and Price

Top Features

The YZ125XTM is explicitly designed for Hare Scrambles and GNCC® racing. For the ideal cross-country power plant, the YPVSTM-equipped 125cc two-stroke engine is paired with a six-speed gearbox.

For the ideal mix of stiffness and flex, the ultra-lightweight YZ125TM-spec frame includes a meticulously designed blend of aluminum castings, forgings, and extrusions. The KYB® speed-sensitive spring-type suspension is an industry-leading fully adjustable suspension tested and adjusted especially for cross-country racers. For GNCC racing, an 18-inch rear wheel, sealed O-ring chain, off-road tires and suspension settings, a standard side stand, and a fuel tank petcock with reserve position is ideal.

The spring-type KYB® fork from Yamaha is paired with a long-travel shock entirely adjustable and optimized for cross-country racing. With a solid design from the front fender to the rear brake guard, the YZ125X maintains the racing history of the YZ motocrosser. The YZ125X is ready to race right out of the box, with an aluminum tapered handlebar, YZ-F-style footpegs, gripper seat, and Dunlop® tires.

YZ125X 2021 Yamaha Dirt Bike


The YZ125X uses a tweaked compression ratio, Yamaha Power Valve System (YPVS) timing, and a model-specific CDI unit to provide broad power delivery that fits off-road terrain and a wide variety of rider skill levels.

The innovative Yamaha Power Valve System on the YZ125X creates a smooth balance of power throughout the rev range, with a broader opening time than the motocross version for smoother control. On narrow, rugged terrain, the small exhaust expansion chamber offers both horizontal and vertical clearance while still offering outstanding exhaust efficiency.

Carbon fiber reed-valve petals with a unique design enhance throttle response and engine performance throughout the rpm range. From dense forests to wide-open fire roads, the smooth-shifting six-speed gearbox provides optimum gearing to optimize the power output from the two-stroke engine.

YZ125X 2021 Yamaha Dirt Bike

For optimum cooling efficiency and endurance in racing conditions, this high-capacity radiator has a significant cooling core protecting louvers. The digital CDI ignition system is designed specifically for the YZ125X and provides a real spark for a quicker, more potent response across the powerband.


For super-precise handling and a smooth ride, the industry-leading KYB® spring-type fork with speed-sensitive damping uses piston speed to control the damping force. This bike is tuned for cross country racing, with minimal wasted stroke and short shocks for the rider.

For increased comfort, control, and fantastic rear-wheel traction in off-road conditions, the rear KYB® shock has 12.4 inches of travel, separate adjusters for high- and low-speed compression damping, and a complete lock oil rebound system. The YZ125X has a carefully engineered aluminum frame and swingarm that gives it the legendary handling that the championship-winning YZ motocrosser has proven on tracks all over the world.

YZ125X 2021 Yamaha Dirt Bike

For weight savings, the removable aluminum rear subframe is made of square-section tubing. With exceptional stopping power and controllability, a large 270mm front disc brake and high-performance pad material provide outstanding machine control and performance. Dunlop® Geomax® AT81 rear and front tires are designed for cross country racing, with a taller sidewall on the 18-inch rear tire to improve comfort and reduce pinch flats.

Additional Features

A race-like “gripper” seat and compact fuel tank, along with a tapered aluminum handlebar and adjustable supports, provide increased mobility and ergonomic comfort for the riders. The YZ125X comes with off-road-oriented pneumatic tires with an eighteen-inch back wheel, a more prominent rear sprocket, and a side stand.

YZ125X 2021 Yamaha Dirt Bike – Price

The new YZ125X 2021 Yamaha Dirt Bike is available at $6,699 in the Team Yamaha Blue option.

YZ125X 2021 Yamaha Dirt Bike

YZ125X 2021 Yamaha Dirt Bike – Technical Specifications


Engine Type 125cc liquid-cooled 2-stroke; reed-valve inducted
Bore x Stroke 54.0 mm x 54.5 mm
Compression Ratio 7.4~8.8:1
Fuel Delivery Carburetor
Transmission 6-speed; multi-plate wet clutch
Final Drive Chain

YZ125X 2021 Yamaha Dirt Bike Specs


Front Suspension KYB® spring-type fork with speed-sensitive damping; fully adjustable, 11.8-in travel
Rear Suspension KYB® single shock; fully adjustable, 12.4-in travel
Front Brakes Hydraulic disc, 270mm
Rear Brakes Hydraulic disc, 245mm
Front Tires 90/90-21 Dunlop® AT81F
Rear Tires 110/90-18 Dunlop® AT81

YZ125X 2021 Yamaha Dirt Bike Specs


L x W x H 84.3 inches x 32.5 inches x 50.6 inches
Seat Height 37.6 inches
Wheelbase 57.3 inches
Rake (Caster Angle) 26.8-degree
Trail 4.6 inches
Maximum Ground Clearance 13.8 inches
Fuel Capacity 2.1 gallons
Wet Weight 209 lb

YZ125X 2021 Yamaha Dirt Bike Specs


Warranty 30 Day (Limited Factory Warranty)

YZ125X 2021 Yamaha Dirt Bike


In conclusion, team Bikes Catalog would love to say that the new YZ125X 2021 Yamaha Dirt Bike is an impressive dirt motorcycle. It features high performing engine that delivers instant throttle response and tremendous acceleration. The chassis is highly lightweight that helps in handling extreme conditions. The braking and suspension system works perfectly fine with the new YZ125X 2021 Yamaha Dirt Bike.