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Key Features

Features Gallery
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    Sharp bodywork and bold graphics

    The YZ125 2-stroke features modern bodywork and graphics for a light look. The fenders and fork protectors give a sharp image, while the side covers and seat cover highlight a fresh look.

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    48mm upside down forks

    The 48mm upside down front forks are similar to the design used on our YZ-F 4-strokes, and feature a separate air/oil system that prevents air from entering the cartridge for more stable damping. The forks run with special YZ125-specific settings, and give even lighter and more agile handling characteristics.

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    Monocross rear suspension system

    The YZ125 is equipped with a Monocross rear suspension system consisting of a modern swingarm, shock and linkage taken from the YZ-F 4-stroke bikes. This system offers outstanding shock absorption characteristics together with good traction for holeshot-winning performance.

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    Wide footrests and clutch adjuster

    The YZ125 2-stroke benefits from a range of features that have come straight from our latest YZ-F 4-stroke models. The wide footrests give additional support for an perfect feeling of controllability during aggressive riding – and there’s also a clutch adjuster for easy tool-free adjustments to cable slack.

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    125cc 2-stroke engine

    At the heart of this hard-charging lightweight is a free-revving 124cc liquid-cooled 2-stroke engine equipped with Yamaha’s renowned YPVS system for increased power. Driving through a close-ratio 6-speed transmission, this super-compact and easy-to-maintain engine can be tuned with our YRRD kit parts for even more winning performance.

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    High-agility ultra-light chassis

    The compact 125cc 2-stroke engine is fitted into a semi-double cradle aluminium frame that is both light and strong, and which delivers a balance of rigidity that gives high levels of rider feedback. With a wet weight of just 94kg, the YZ125 is one of the easiest dirt bikes to flick through bends and power over washboard sections.

Technical Specifications

Download Factsheet
  • Engine
    Engine type
    liquid-cooled, 2-stroke, Forward-inclined single cylinder, 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
    Ignition system
    Starter system
    Transmission system
    Constant Mesh, 6-speed
    Final transmission
    Mikuni TMX38
  • Chassis
    Semi double cradle
    Caster Angle
    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, Ø250 mm
    Rear brake
    Hydraulic single disc, Ø245 mm
    Front tyre
    80/100-21 51M
    Rear tyre
    100/90-19 57M
  • Dimensions
    Overall length
    2137 mm
    Overall width
    825 mm
    Overall height
    1295 mm
    Seat height
    975 mm
    Wheel base
    1445 mm
    Minimum ground clearance
    363 mm
    Wet weight (including full oil and fuel tank)
    94 kg
    Fuel tank capacity
    Oil tank capacity