Yamaha YS 125

Production years: 2018–2021
Brand: Yamaha

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YAMAHA YS125 (2018-Present)

Selected year: 2021

Technical specifications

Engine capacity: 125 cm³
Power: 10.5 hp (7.8 kW) at 7,500 rpm
Wet weight: 129 kg
Seat height: 795 mm

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Overview

The Yamaha YS 125 is a naked motorcycle produced from 2018 through 2021. The 2021 model has a 125.0 cm³ single-cylinder, two-stroke engine producing 10.5 hp (7.8 kW) and 10.8 Nm of torque at 6,000 rpm; its wet weight is 129 kg.

At 795 mm, the seat may make it harder for shorter riders to plant both feet at a stop. The 129 kg wet weight helps keep low-speed maneuvers manageable. Fuel consumption is 2.00 liters/100 km, and the 14-liter tank gives a calculated full-tank range of about 700 km. A front disc and rear drum provide different braking setups, while the chain final drive needs periodic cleaning and adjustment.

Specifications

Engine

Bore x stroke: 54.4 x 57.9 mm
Engine capacity: 125 cm³
Compression ratio: 10.0:1
Cooling system: Air
Engine type: Single, two-stroke
Fuel system: Injection
Ignition: TCI
Lubrication system: Wet Sump
Oil capacity: 1.2 L
Starting: Electric
Valves per cylinder: 2

Performance and transmission

Co2 emissions: 46 g/km CO₂
Fuel consumption: 2 L/100 km
Power: 10.5 hp (7.8 kW) at 7,500 rpm
Power weight ratio: 0.0814 HP/kg (wet)
Torque: 10.8 Nm at 6,000 rpm
Clutch: O-ring chain
Final drive: Chain
Gearbox: Manual 6-speed
Transmission type: Manual

Dimensions and weight

Fuel capacity: 14 L
Ground clearance: 150 mm
Overall height: 1,050 mm
Overall length: 2,005 mm
Overall width: 735 mm
Seat height: 795 mm
Wet weight: 129 kg
Wheelbase: 1,320 mm

Chassis and suspension

Frame: Steel, diamond shaped
Front suspension: Telescopic fork
Front wheel travel: 120 mm
Rake: 26.8°
Rear suspension: Swing arm
Rear wheel travel: 112 mm
Trail: 117 mm

Brakes and wheels

Front brakes: Single disc. Hydraulic.
Front brakes diameter: 245 mm
Front tyre: 2.75-18
Rear brakes: Expanding brake (drum brake). Hydraulic.
Rear brakes diameter: 130 mm
Rear tyre: 100/80-18

Colours and equipment

Colours: Power red, Competition White, Midnight Black

Model years

No recorded specification changes between model years.

Specification
Engine capacity	125 cm³	125 cm³	125 cm³	125 cm³
Power	10.5 hp (7.8 kW)	10.5 hp (7.8 kW)	10.5 hp (7.8 kW)	10.5 hp (7.8 kW)
Torque	10.8 Nm	10.8 Nm	10.8 Nm	10.8 Nm
Wet weight	129 kg	129 kg	129 kg	129 kg
Seat height	795 mm	795 mm	795 mm	795 mm
Fuel capacity	14 L	14 L	14 L	14 L

Pros and cons

Advantages

Low fuel use
Consumption of 2.00 liters/100 km and a 14-liter tank contribute to a calculated range of about 700 km.
Manageable weight
At 129 kg wet, the YS 125 is relatively easy to move around at low speeds and when parking.

Things to consider

Rear drum brake
The rear uses a drum rather than a disc, so braking hardware differs between the front and rear wheels.
Chain upkeep
The chain final drive needs regular cleaning and adjustment.
Seat height
The 795 mm seat can make it difficult for shorter riders to put both feet flat on the ground.

Rider fit

Rider fit calculator

Calculated in your browser

Seat height: 795 mmInseam 78.9 cm

Seat height: 795 mm

Your height

Inside leg lengthOptional

Don't know it? Leave this empty and we'll estimate it from your height.

Estimated from your height: 79 cm

How to measure

Stand barefoot with your back to a wall. Hold a book firmly between your legs, then measure from the floor to the top edge of the book.

Estimated ground reach

Both feet likely flat

You should have a stable stance at a stop, although seat width and suspension setup still matter.

Seat height

795 mm

Approx. loaded height

765 mm

Estimate assumes about 30 mm of suspension sag. Seat width, footwear, luggage and suspension settings can change real reach. Always sit on the motorcycle before buying.