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Yamaha YZ125

Lightweight speed racer.

Whether you're in competition or riding for fun, the YZ125 loves to be ridden hard and its ultra-low weight allows you to take the tightest of lines and flick it around corners. Once you've learnt how to get the most from the 6-speed gearbox, you'll be amazed how quickly this 125 will go.

This legendary lightweight comes with a new seat for better rider agility, and a gold-coloured chain. And like all of Yamaha's latest dirt bikes, the YZ125 features our bold new speedblock graphics.

With punchy 2-stroke power and superb agility, this lightweight racer is built to deliver an exhilarating ride.


Engine type

liquid-cooled, 2-stroke, Forward-inclined single cylinder, reed valve, reed valve with YPVS



Bore x stroke

54.0 mm x 54.5 mm

Compression ratio

8.6 ~10.7 : 1

Lubrication system


Clutch type

Wet, multiple-disc coil spring

Fuel system

Mikuni TMX38

Ignition system


Starter system


Transmission system

Constant Mesh, 6-speed

Final transmission




Semi double cradle

Front suspension system

Upside-down telescopic fork

Front travel

300 mm

Caster angle



107 mm

Rear suspension system

Swingarm, (link suspension)

Rear travel

315 mm

Front brake

Single Disc, Ø 250 mm

Rear brake

Single Disc, Ø 245 mm

Front tyre

80/100-21 51M

Rear tyre

100/90-19 57M


Overall length

2,139 mm

Overall width

827 mm

Overall height

1,318 mm

Seat height

998 mm

Wheel base

1,443 mm

Minimum ground clearance

388 mm

Wet weight (including full oil and fuel tank)

94 kg

Fuel tank capacity

8.0 litres

Oil tank capacity

0.7 litres