The Yamaha YS125 motorcycle specifications include a 125 cc (7.63 cu in) engine, power of 10.5 hp (7.6 kW) @ 7,500 rpm, a 5-speed gearbox, and a listed weight of 129 kg (284.4 lb).
Key specifications
The 2018 model is treated as the standard specification. Only later model years with a different supplied value are shown below.
How the Yamaha YS125 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 80% lower than the Yamaha database average. Around the 18th percentile across Yamaha models.
About 77% lower than the Yamaha database average. Around the 25th percentile across Yamaha models.
About 31% lighter than the Yamaha database average. Around the 26th percentile across Yamaha models.
Very close to the Yamaha database average. Around the 55th percentile across Yamaha models.
About 7% larger than the Yamaha database average. Around the 57th percentile across Yamaha models.
Mechanical overview
Additional useful specifications
| Front tire size | 2.75-18 |
|---|---|
| Rear tire size | 100/80-18 |
| Rear tire width | 100 mm |
| Rear tire aspect ratio | 80% |
| Rear rim diameter | 18 in |
| Engine oil capacity | 1.20 L (1.27 US qt) |
| Power-to-weight ratio | 0.081 hp/kg |
| Power-to-weight | 81.4 hp/tonne |
| Specific power | 84.0 hp/L |
| Bore/stroke ratio | 0.91:1 (Undersquare) |
Engine specifications
| Engine type | Single cylinder, four-stroke |
|---|---|
| Displacement | 125 cc (7.63 cu in) |
| Power | 10.5 hp (7.6 kW) @ 7,500 rpm |
| Torque | 10.8 Nm (1.1 kgf-m or 8.0 ft.lbs) @ 6,000 rpm |
| Bore × stroke | 52.4 x 57.9 mm (2.1 x 2.3 inches) |
| Compression ratio | 10.0:1 |
| Valves per cylinder | 2 |
| Cooling system | Air |
| Fuel system | Injection |
| Fuel control | Single Overhead Cams (SOHC) |
| Ignition | TCI |
| Starter | Electric |
| Lubrication | Wet sump |
| Oil capacity | 1.20 L (1.27 US qt) |
Transmission and drivetrain
| Gearbox | 5-speed |
|---|---|
| Final drive | Chain (final drive) |
| Clutch | Wet, multiple-disc coil spring |
Chassis and suspension
| Frame | Steel, diamond shaped |
|---|---|
| Front suspension | Telescopic forks |
| Rear suspension | Swingarm |
| Front wheel travel | 120 mm (4.7 inches) |
| Rear wheel travel | 105 mm (4.1 inches) |
| Rake | 26.0° |
| Trail | 90 mm (3.5 inches) |
Brakes, wheels and tires
| Front brakes | Single disc |
|---|---|
| Rear brakes | Expanding brake (drum brake) |
| Front tire | 2.75-18 |
| Rear tire | 100/80-18 |
Dimensions and weight
| Wet weight | 129 kg (284.4 lb) |
|---|---|
| Seat height | 795 mm (31.3 inches) |
| Overall length | 2,005 mm (78.9 inches) |
| Overall width | 735 mm (28.9 inches) |
| Overall height | 1,050 mm (41.3 inches) |
| Wheelbase | 1,320 mm (52.0 inches) |
| Ground clearance | 150 mm (5.9 inches) |
Fuel and emissions
| Fuel capacity | 14.00 L (3.70 US gal) |
|---|
Other specifications
| Color options | White, red, black |
|---|---|
| Seat | Dual seat and passenger grab rails |
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.