The Yamaha YZ125X motorcycle specifications include a 124 cc (7.57 cu in) engine, a 6-speed gearbox, and a listed weight of 93.5 kg (206.1 lb).
Key specifications
The 2017 model is treated as the standard specification. Only later model years with a different supplied value are shown below.
How the Yamaha YZ125X compares
This compares the motorcycle with all Yamaha models in this specifications database. The blue marker is this model and the grey line is the Yamaha database average.
About 77% lower than the Yamaha database average. Around the 18th percentile across Yamaha models.
About 50% lighter than the Yamaha database average. Around the 8th percentile across Yamaha models.
About 39% smaller than the Yamaha database average. Around the 27th percentile across Yamaha models.
Yamaha database percentile rankings
Percentiles show where this motorcycle sits across the Yamaha specifications database. They are descriptive database rankings, not performance ratings.
124 cc — larger displacement than about 18% of Yamaha models.
93.5 kg — heavier than about 8% of Yamaha models, or lighter than about 92%.
8 L — larger than about 27% of Yamaha fuel tanks in this database.
Mechanical overview
Additional useful specifications
| Front tire size | 80/100-21 |
|---|---|
| Rear tire size | 100/90-18 |
| Front tire width | 80 mm |
| Front tire aspect ratio | 100% |
| Front rim diameter | 21 in |
| Rear tire width | 100 mm |
| Rear tire aspect ratio | 90% |
| Rear rim diameter | 18 in |
| Engine oil capacity | 0.70 L (0.74 US qt) |
| Bore/stroke ratio | 0.99:1 (Square) |
Model information
| Category | Enduro / offroad |
|---|
Engine specifications
| Engine type | Single cylinder, two-stroke |
|---|---|
| Displacement | 124 cc (7.57 cu in) |
| Bore × stroke | 54.0 x 54.5 mm (2.1 x 2.1 inches) |
| Compression ratio | 7.1:1 |
| Cooling system | Liquid |
| Fuel system | Carburettor. Mikuni TMX 38 |
| Ignition | CDI |
| Starter | Kick |
| Lubrication | Premix |
| Oil capacity | 0.70 L (0.74 US qt) |
Transmission and drivetrain
| Gearbox | 6-speed |
|---|---|
| Final drive | Chain (final drive) |
| Clutch | O-ring chain |
Chassis and suspension
| Frame | Semi-double cradle aluminium frame |
|---|---|
| Front suspension | Speed-sensitive system inverted fork |
| Rear suspension | Fully adjustable single shock |
| Front wheel travel | 300 mm (11.8 inches) |
| Rear wheel travel | 315 mm (12.4 inches) |
| Rake | 26.0° |
| Trail | 109 mm (4.3 inches) |
Brakes, wheels and tires
| Front brakes | Single disc. Hydraulic. |
|---|---|
| Rear brakes | Single disc. Hydraulic. |
| Front tire | 80/100-21 |
| Rear tire | 100/90-18 |
Dimensions and weight
| Wet weight | 93.5 kg (206.1 lb) |
|---|---|
| Wheelbase | 1,443 mm (56.8 inches) |
Fuel and emissions
| Fuel capacity | 8.00 L (2.11 US gal) |
|---|
Other specifications
| Color options | Blue/White |
|---|
Disclaimer: Specifications may vary by market, trim, production date and optional equipment, and scraped or historical data can contain errors. Comparison and percentile values are calculated from Yamaha models in this specifications database. Always double-check important specifications against the motorcycle owner’s/service manual and official Yamaha information before relying on them. Visit the official Yamaha website.