New Yamaha YZ 125 Motocross Motorcycles for sale

Two-Stroke evolution.
Featuring lightweight race-bred engine internals and benefitting 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-efficiency air intake ensures optimum performance and instant throttle response – and the slick shifting close-ratio 6-speed transmission helps you to shave precious seconds off 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 flat 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!

Features

Most powerful YZ125 engine
The high-tech 125cc 2-stroke engine is the most powerful unit ever used on the YZ125. Equipped with Yamaha’s famous YPVS that gives instant response and excellent useability across the rpm range – and featuring lightweight race-bred internals – it’s destined to take you to the victorYZone!

Ultra-slim bodywork
The latest generation bodywork is ultra-slim, with the area between the rider’s knees the narrowest it’s ever been on a YZ125 – and this athletic and modern design underlines the bike’s lightness and compactness. These slim dimensions give a high level of rider mobility and reinforce this lightweight racer’s feeling of agility.

Keihin Powerjet carburettor
The YZ125 is equipped with a Keihin PWK 38,1mm carburettor featuring a solenoid controlled powerjet for even more explosive performance – giving a real advantage out of the gate and when accelerating hard out of corners. A TPS (Throttle Position Sensor) and 3D map controlled CDI ensure optimized ignition timing, while the V-Force reed valve assembly ensures optimum intake efficiency at all engine speeds.

Smooth shifting 6-speed transmission
Every second counts, and for reduced lap times the YZ125 runs with a super-smooth shifting 6-speed transmission that enables you to accelerate efficiently and stay out in front. Transmission ratios have been carefully chosen by Yamaha’s engineers to maximize race performance and power output in all conditions.

High efficiency air intake
The complete intake system has been developed to provide the smoothest possible flow of air into the 38.1mm carburettor for a high level of engine efficiency. Components including the seat base, rear frame and sidepanels are all designed to reduce air resistance for stronger and more useable power output.

Race developed ergonomics
Engine performance is just one element of being competitive – the ability to handle the power effectively and take total control of the chassis is also vital. A flat seat with a low front combined with a slim tank and narrow radiator shrouds make it easy to shift your weight around the bike for increased controllability when braking, accelerating and cornering.

Best-in-class KYB suspension
Yamaha’s SSS (Speed Sensitive System) KYB front forks are widely regarded as being amongst the best designs available on a production motocross bike. With idealized low speed damping settings on both the front and rear suspension systems, the YZ125 delivers class-leading handling and excellent traction.

Powerful braking system
The brakes on the YZ125 have been developed to handle the engine’s high performance. The 270mm diameter front disc and 240mm diameter rear disc are equipped with big-piston calipers that produce effective and controllable stopping power.

Single bolt seat fixing
A single bolt seat fixing gives quick and easy maintenance, and the design of the aluminium rear frame also contributes towards intake efficiency by enabling a smooth flow of fresh air into the airbox.

In-mould graphics and factory style rims
Sporting the eye-catching ‘Icon Blue’ Yamaha Racing colours and graphics, the YZ125 looks the part with its dynamic look completed with in-mould graphics and slimeline bodywork, with factory-style rims completing the race-bike look.

Icon Blue

YZ 125

Offer Ends 31/05/2026

Yamaha - Free Health Check

Yamaha - Free 12 months Roadside Assistance

YZ 125

Offer Ends 31/03/2026

Yamaha - Free 12 months Roadside Assistance

Your Yamaha looks after you — now let us return the favour.

We’re offering a FREE motorcycle or scooter health check at participating authorised Yamaha dealers across the UK. There’s no catch, no obligation, and no pressure. Just expert eyes giving your bike a once-over so you can ride with confidence.

What’s included?
A trained Yamaha technician will check the key components of your bike, helping to spot potential issues early and make sure everything’s working as it should.

Who's it for?

Any Yamaha model
Any age
Any mileage

If it’s a Yamaha, it’s welcome.

Why book one?

Peace of mind before your next ride
Expert inspection by Yamaha-trained technicians
Completely free, with no obligation to carry out further work. If anything does need attention, you’ll be informed clearly — the choice is always yours.

How to get yours?

Simply fill in the form here, then contact {site_title} to book a convenient date and time. Note: dates are subject to availability.

Terms & Conditions

Dealer Participation and Conditions

The Vehicle Health Check is provided subject to the individual terms and conditions of the participating authorised Yamaha dealer.
Participating dealers may decline to undertake inspection, servicing, or repair work on vehicles that exceed a specified age, mileage, or condition threshold.
Customers are strongly advised to contact their chosen dealer in advance to confirm eligibility and acceptance before applying for a free health check voucher.

Bookings

The free health check is valid until 31st December 2026.
Once customers have entered their details on the online form, customers need to book their health check direct with participating Authorised Yamaha Dealers.
Bookings days and times are subject to availability and will be confirmed by the dealer with the customer at the point of booking.
Customers will need to present their free health check email (received once the online form is complete) to their participating Authorised Yamaha Dealer on the day of the health check.

Electronic Health Check Compatibility

Motorcycles manufactured prior to 2015 may not be compatible with, or eligible for, an electronic health check due to non-compatibility with the Yamaha diagnostic systems.

Proof of Ownership

Customers may be required to present a valid V5 registration document, or equivalent proof of ownership, together with their health check voucher to the selected authorised Yamaha dealer at the time of the vehicle health check, as evidence that they are the registered keeper.

Failure to Provide Documentation

Failure to present the required documentation may result in the authorised dealer refusing to carry out the complimentary vehicle health check.

General

Neither Yamaha Motor nor the authorised dealer shall be liable for any pre-existing damage, defects or faults, or normal wear and tear.
Customers authorise the authorised dealer to carry out the agreed inspection or repair work. Any recommended additional work identified will be communicated and authorised by the customer prior to completion.
Motorcycles not collected within one working day of notification that work has been completed may be subject to reasonable storage charge.

Service your Yamaha motorcycle or scooter at a participating Official Yamaha Dealership** before March 31st 2026 and receive 12 months free YOU Yamaha Road Assistance*. Things like punctures and flat batteries can happen to anyone, but our breakdown cover gives you peace of mind so that you can ride without worry.

*Terms & Conditions
Eligibility:
The offer is open to anyone who has any service from the Yamaha service schedule using Genuine Yamaha Parts at participating Official Yamaha Dealers.
The service needs to take place between 1 November 2025 until 31 March 2026.
The service must be on a Yamaha motorcycle or scooter.
Machines within 2 years of warranty registration are not eligible for this offer.
The customer will need to complete and sign a form with their dealer at the time of the service for the application to be submitted.
Offer excludes services on any off-road competition or non-road going Yamaha models.

The Offer:
Receive free 12 months YOU Yamaha Motor Road Assistance - Conditions apply - for full details see https://www.yamaha-motor.eu/gb/en/service-support/yamaha-assist/
At the end of the year, there is an option to extend the cover for a further year, at the cost of the policy holder (subject to eligibility).

General Terms and Conditions:
The Promoter reserves the right to cancel or award a different offer up to the same value due to circumstances beyond their control.
The Promoter's decision is final and no correspondence will be entered into.
The offer is non-transferable and cannot be exchanged for cash or other prizes, or passed onto another person when the motorcycle or scooter is sold.
The Promoter is not responsible for lost entries.
Any personal data relating to competition entrants will be used in accordance with the Promoter’s privacy policy which can be found here.
The Promoter is Yamaha Motor Europe NV, Branch UK of Units A2-A3, Kingswey Business Park, Forsyth Road, Woking, Surrey GU21 5SA.

Engine

Engine type	Liquid-cooled, 2-stroke, Forward-inclined single cylinder, Reed valve with YPVS
Displacement	125cc
Bore x stroke	54,0 mm 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	Keihin PWK38S/1

Chassis

Frame	Semi double cradle
Caster angle	26º
Trail	109 mm
Front suspension system	Upside-down telescopic fork
Rear suspension system	Swingarm, (link suspension)
Front travel	300 mm
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

Dimensions

Overall length	2.135 mm
Overall width	825 mm
Overall height	1.295 mm
Seat height	975 mm
Wheel base	1.440 mm
Minimum ground clearance	365 mm
Wet weight (including full oil and fuel tank)	95 kg
Fuel tank capacity	7,0 L
Oil tank capacity	0,7 L

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