Across 4 covered model years from 2018 to 2021, the Yamaha YS125 motorcycle has a listed wet/running weight of 284.4 lb (129 kg).
Yamaha YS125 weight overview
The weight is relatively manageable, so the bike should demand less effort than a heavyweight machine when backing up, parking or making slow-speed corrections.
Light Motorcycle
How heavy is the Yamaha YS125?
wet weight
Using a model-level wet weight comparison, the Yamaha YS125 is lighter than about 87.5% of 28 Yamaha allround models with compatible weight data.
Ready-to-ride weight
Bike + rider total weight
These totals use the model’s representative wet weight. They exclude riding gear, luggage and a passenger.
Yamaha YS125 weight & related specs
| Model years covered | 2018, 2019, 2020, 2021 |
|---|---|
| Wet / running weight | 284.4 lb (129 kg) |
| Engine displacement | 125 cc |
| Power | 10.5 hp |
| Torque | 8 lb-ft (10.8 Nm) |
| Fuel capacity | 3.7 US gal (14 L) |
| Full-tank fuel weight (estimated) | 23 lb (10.4 kg) |
Weight changes by model year
Useful weight calculations
| Horsepower per 100 lb | 3.69 hp / 100 lb |
|---|---|
| Pounds per horsepower | 27.09 lb / hp |
| Torque per 100 lb | 2.8 lb-ft / 100 lb |
| Displacement per pound | 0.44 cc / lb |
| Weight per 100 cc | 227.5 lb / 100 cc |
| Fuel weight as % of bike weight | 8.1% |
What the weight numbers tell you
Yamaha YS125 weight FAQ
What is the Yamaha YS125 wet weight?
The supplied wet/running weight is 284.4 lb (129 kg) across the model years covered here. That figure is the most useful available number for real-world handling because operating fluids and fuel are included.
Is the Yamaha YS125 lighter or heavier than other Yamaha allround models?
It is comparatively light for this Yamaha category. The model lands near the 12th percentile for weight in the compatible dataset.
Which Yamaha YS125 years have different weight specs?
No clear weight change appears in the usable model-year data. Other specifications may still differ by year.
How much does a full tank add to the Yamaha YS125?
Based on the supplied 3.7 US gal (14 L) tank capacity, the gasoline itself weighs about 23 lb (10.4 kg) when full. On models with a wet/running weight, that fuel mass is already included in the listed ready-to-ride figure.
What is the combined Yamaha YS125 and rider weight?
Using the model’s representative wet/running weight and a 180 lb rider, the combined bike-and-rider mass is about 464.4 lb (210.6 kg) before riding gear, luggage or a passenger.
What is the Yamaha YS125 power-to-weight ratio?
Available model-year data produces 3.69 hp per 100 lb. It shows engine output relative to motorcycle mass rather than just quoting peak horsepower. That places it around the 3rd percentile within the compatible Yamaha allround power-to-weight comparison.
What is the Yamaha YS125 torque per 100 lb of bike weight?
Where compatible torque and weight figures are available, the model works out to 2.8 lb-ft per 100 lb. This gives more context than torque alone because it relates engine twist to the mass it has to move.
How many cc does the Yamaha YS125 have per pound?
The available figures work out to 0.44 cc per lb. This is not a performance rating, but it is a useful way to compare engine size against total motorcycle mass.
How does the Yamaha YS125 compare with the median Yamaha allround weight?
Compared with the median Yamaha allround weight of 383.8 lb (174.1 kg), the model is roughly 99.4 lb (45.1 kg) lighter.
Motorcycle specifications can vary by model year, market, equipment and the exact dry/curb-weight definition. Calculated fuel-weight and ratio figures on this page are estimates derived from the supplied specifications. Confirm critical figures in the owner’s manual or on the official Yamaha Motorsports website.