Its sharp looking ultra slim bodywork gives you a high degree of controllability on the ground and in the air – and the at seat and race-developed ergonomics allow you to move easily around the bike when braking and accelerating hard. The YZ125 is in it to win it – now just add your ability and prepare to enter the victorYZone!
Review – Key Features – Features & Benefits – Specifications
2025 Yamaha YZ125: TWO‑STROKE EVOLUTION.
Introducing the new 2025 Yamaha YZ125…
More powerful, more capable, more advanced. Offering the ideal blend of performance, reliability and usability to develop the skills to win.
More powerful, capable and advanced, this two-stroke evolution from the iconic YZ heritage is the perfect choice for riders stepping up from the 85cc class. Offering the ideal blend of performance, reliability, and usability, the competition-ready YZ125 develops the skills you need to win.
The choice of future champions.
Right now the YZ125 is the bike of choice for future champions. The YZ125’s super slim bodywork, agile high specification chassis and at seat allow you to shift weight quickly for total control – and with Yamaha’s most powerful 125cc production engine, high eficiency braking system and state-of-the-art suspension, this bike is destined for the victorYZone!
When you’re aiming for the top you need the right bike that can deliver the performance you need to show you’re a winner. The YZ125’s engine features a YPVS for increased usability over a wider rpm range – and with its Keihin powerjet carburetor and slick shifting 6-speed transmission, the best-ever YZ125 gives tomorrow’s professional riders the winning performance they need to make their name.
And if you’re really serious about making it to the top, Yamaha’s highly successful YZ bLU cRU FIM Europe Cup program is the way to go. It’s where tomorrow’s stars get a chance to qualify for the bLU cRU Europe Cup SuperFinale, and it’s the place where winning riders can take their rst steps towards a professional career
Yamaha has been building 2-stroke motocross bikes for the past 50 years – and has been an equally long racing history. It is this unrivalled experience that has enabled the company to develop the latest YZ125 – a bike that is built to take you into the victorYZone!
Featuring lightweight race-bred engine internals and bene tting from Yamaha’s famous torque-boosting YPVS (Yamaha Power Valve System), the YZ125 develops hard-hitting power that keeps you way out front.
The high-e ciency air intake ensures optimum performance and instant throttle response – and the slick shifting close-ratio 6-speed transmission helps you to shave precious seconds o your lap times.
Its sharp looking ultra slim bodywork gives you a high degree of controllability on the ground and in the air – and the at seat and race-developed ergonomics allow you to move easily around the bike when braking and accelerating hard. The YZ125 is in it to win it – now just add your ability and prepare to enter the victorYZone!
2025 Yamaha YZ125 Totalmotorcycle.com Key Features
- Liquid-cooled Yamaha Power Valve System (YPVS)-equipped 125cc two-stroke engine
- Throttle position sensor and 3D-map-controlled CDI unit resulting in crisp throttle response and superior rideability
- Straight intake design improves feeling of power in the low rpm range
- High performance front and rear brake setup offers exceptional braking power and feel, while reducing unsprung weight
- Ergonomically designed with a flat seat, narrow fuel tank, smoothly integrated body panels and slim shroud width to enable greater freedom of movement forward and back.
2025 Yamaha YZ125 Totalmotorcycle.com Features and Benefits
TOP FEATURES
Powerful Two-Stroke YZ125 Engine
Yamaha’s advanced, liquid-cooled 125cc two-stroke engine provides impressive acceleration, thrilling mid- to high-rpm power, along with supreme usability.
Class-Leading KYB® Suspension
The YZ125’s renowned suspension performance offers unmatched levels of control, capability and comfort by way of the fully adjustable 48mm inverted KYB® front fork, including a leaf spring in the mid-speed valve for more precise damping, and the fully adjustable KYB® rear shock featuring reduced-friction Kashima Coat™ internals. It all adds up to class-defining suspension and handling characteristics.
Rider-Friendly Chassis
Lightweight finely tuned chassis means nimble handling, more control and less rider fatigue” the ideal platform for advancing skills and gaining confidence.
High Performance Braking System
High performance front and rear brake setup offers exceptional braking power and feel.
Confidence-Inspiring Ergonomics
A carefully considered ergonomic design includes a flatter seat, narrow fuel tank, smoothly integrated body panels and slim shroud width to enable greater freedom of movement forward and back, allowing the rider to easily shift body weight for increased control and confidence.
Aggressive YZ Styling
Aggressive bodywork including slim body panels and blacked-out radiator shrouds integrate with a bold graphics scheme to highlight the YZ’s unmatched racing pedigree. Premium Yamaha graphics are embedded to provide excellent durability and scratch resistance.
Perfect for Aspiring Motocrossers
A pure motocross machine, the light, nimble, competition-ready YZ125 is the perfect choice for riders stepping up from the 85cc class.
ENGINE
Powerful Two-Stroke YZ125 Engine
Yamaha’s advanced, liquid-cooled 125cc two-stroke engine provides impressive acceleration, thrilling mid- to high-rpm power, along with supreme usability.
Yamaha Power Valve System
Patented Yamaha Power Valve System (YPVS™) combines crisp, hard-hitting bottom-end acceleration with strong mid-range and top-end.
Precise Fueling & Ignition Timing
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.
Close-Ratio Transmission
Close-ratio six-speed transmission has wider transmission gear tooth width and optimized 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
High-capacity radiator with dark louvers deliver maximum cooling efficiency and an aggressive look.
CHASSIS/SUSPENSION
Lightweight Frame
Race-proven, highly developed aluminum semi-double cradle frame is engineered to provide just the right amount of strength and flex for the perfect balance of stability and cornering performance. Removable aluminum rear subframe is constructed of square-section tubing for reduced weight.
Rider-Friendly Chassis
Lightweight finely tuned chassis means nimble handling, more control and less rider fatigue””the ideal platform for advancing skills and gaining confidence.
Industry-Leading KYB® Fork
The Speed Sensitive System 48mm inverted KYB® fork includes a leaf spring in the mid-speed valve for more precise damping and increased performance and comfort, while offering up 11.8 inches of travel.
Advanced KYB® Shock
Fully adjustable KYB® rear shock features reduced-friction Kashima Coat™ internals, separate adjusters for high- and low-speed compression damping, a full lock oil rebound system for increased comfort, and 12.4 inches of travel. It all adds up to fantastic rear wheel control and class-leading capability.
High Performance Braking System
The high performance braking system features a 270mm front rotor, 240mm rear rotor, large front pistons and rigid calipers, all combining to provide exceptional braking power and feel.
Race-Ready Tires
Premium Bridgestone® Battlecross X20 tires offer strong cornering grip and race-developed performance.
ADDITIONAL FEATURES
Race-Ready Features
Complete with an aluminum handlebar, two-position adjustable handlebar clamp, wide foot pegs, gripper seat, adjustable clutch lever with works-style cable adjuster and lightweight rear sprocket design, the YZ125 is competition-ready straight out of the crate.
*Manufacturer’s Suggested Retail Price (MSRP) shown. Does not include tax, title, prep or destination charges. Actual prices set by dealer.
**Fuel Economy is estimated.
***Wet weight includes the vehicle with all standard equipment and all fluids, including oil, coolant (as applicable) and a full tank of fuel. It does not include the weight of options or accessories. Wet weight is useful in making real-world comparisons with other models.
2025 Yamaha YZ125 – Totalmotorcycle.com USA Specifications/Technical Details
US MSRP Price: $7,099 USD
Canada MSRP Price: $8,299 CDN
Europe/UK MSRP Price: £ See Dealer for Pricing in GBP (On The Road inc 20% Vat)
ENGINE
| Engine Type | 125cc liquid-cooled 2-stroke; reed-valve inducted |
| Bore x Stroke | 54.0mm x 54.5mm |
| Compression Ratio | 8.2~10.1:1 |
| Fuel Delivery | Hitachi Astemo® Keihin PWK38S carburetor |
| Transmission | Constant-mesh 6-speed; multiplate wet clutch |
| Final Drive | Chain |
| Fuel Capacity | 1.8 gal |
CHASSIS
| 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, 240mm |
| Tires/Front | 80/100-21 Bridgestone® Battlecross X20F |
| Tires/Rear | 100/90-19 Bridgestone® Battlecross X20 |
DIMENSIONS
| LxWxH | 84.1 in x 32.5 in x 51.0 in |
| Seat Height | 38.6 in |
| Wheelbase | 56.9 in |
| Rake (Caster Angle) | 26° |
| Trail | 4.3 in |
| Max. Ground Clearance | 14.4 in |
| Fuel Capacity | 1.8 gal |
| Wet Weight*** | 209 lbs |
OTHER
| Warranty | 30 Day (Limited Factory Warranty) |
*Manufacturer’s Suggested Retail Price (MSRP) shown. Does not include tax, title, prep or destination charges. Actual prices set by dealer.
**Fuel Economy is estimated.
***Wet weight includes the vehicle with all standard equipment and all fluids, including oil, coolant (as applicable) and a full tank of fuel. It does not include the weight of options or accessories. Wet weight is useful in making real-world comparisons with other models.
2025 Yamaha YZ125 – Totalmotorcycle.com Canada Specifications/Technical Details
ENGINE 2-stroke, liquid-cooled, crankcase reed-valve, single
DISPLACEMENT 125 cc
BORE AND STROKE 54.0 x 54.5 mm
COMPRESSION RATIO 8.2~10.1:1
FUEL DELIVERY Keihin PWK38S carburetor
IGNITION / STARTING CDI / Kick
TRANSMISSION Constant mesh, 6-speed
FINAL DRIVE Chain
SUSPENSION (FRONT) Fully adjustable 48 mm inverted fork / 300 mm (11.8″) wheel travel
SUSPENSION (REAR) Fully adjustable link Monocross / 315 mm (12.4″) wheel travel
BRAKES (FRONT) 270 mm floating disc / twin piston caliper
BRAKES (REAR) 240 mm disc / single piston caliper
TIRES (FRONT) 80/100-21 Bridgestone® Battlecross X20F
TIRES (REAR) 100/90-19 Battlecross X20
LENGTH 2,135 mm (84.1″)
WIDTH 825 mm (32.5″)
HEIGHT 1,295 mm (51″)
WHEELBASE 1,445 mm (56.9″)
GROUND CLEARANCE 365 mm (14.4″)
SEAT HEIGHT 980 mm (37.6″)
FUEL CAPACITY 8 litres (1.8 imp. gal)
WET WEIGHT 95 kg (209 lb)
COLOUR(S) Yamaha Racing Blue
Anniversary White
2025 Yamaha YZ125 – Totalmotorcycle.com European Specifications/Technical Details
Engine
Engine type Liquid-cooled;2-stroke;Single cylinder
Displacement 125cc
Bore x stroke 54,0 x 54,5 mm
Compression ratio 8,2-10,1 : 1
Lubrication system Premix
Clutch type Wet;Multiple Disc
Ignition system CDI
Starter system Kick
Transmission system Constant Mesh;6-speed
Final transmission Chain
Fuel system Fuel system
Chassis
Frame Semi double cradle
Front suspension system Telescopic fork
Front travel 300 mm
Rear suspension system link suspension;Swingarm
Rear travel 315 mm
Front brake Hydraulic single disc, Ø270 mm
Rear brake Hydraulic single disc, Ø240 mm
Front tyre 80/100-21 51M
Rear tyre 100/90-19 57M
Caster angle 26º
Trail 109 mm
Dimensions
Overall length 2.135 mm
Overall width 825 mm
Overall height 1.295 mm
Seat height 980 mm
Wheel base 1.445 mm
Minimum ground clearance 365 mm
Wet weight (including full oil and fuel tank) 96 kg
Fuel tank capacity 7,0 L
Oil tank capacity n/a
Manufacturer Specifications and appearance are subject to change without prior notice on Total Motorcycle (TMW).
