Across 18 covered model years from 2008 to 2025, the Yamaha YZ125 motorcycle has supplied wet/running weights ranging from 207 lb (93.9 kg) to 209 lb (94.8 kg) and dry weights ranging from 190 lb (86.2 kg), depending on model year.
Yamaha YZ125 weight overview
This sits at the very light end of motorcycle mass, which is especially useful when the bike has to be moved around by hand or held on uneven ground.
Very Light Motorcycle
How heavy is the Yamaha YZ125?
wet weight
Using a model-level wet weight comparison, the Yamaha YZ125 is lighter than about 83.3% of 15 Yamaha motocross bikes with compatible weight data.
Dry vs 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 YZ125 weight & related specs
| Model years covered | 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024, 2025 |
|---|---|
| Wet / running weight | 207 lb (93.9 kg) to 209 lb (94.8 kg) |
| Dry weight | 190 lb (86.2 kg) |
| Engine displacement | 124 cc to 125 cc |
| Fuel capacity | 1.8 US gal (6.81 L) to 2.11 US gal (8 L) |
| Full-tank fuel weight (estimated) | 11.2 lb (5.1 kg) to 13.1 lb (6 kg) |
Weight changes by model year
The 2008 model is used as the baseline where data is available. Only later supplied values that differ are shown below. A year pill does not mean every individual weight field was supplied for that year.
Useful weight calculations
| Displacement per pound | 0.59 cc / lb to 0.65 cc / lb |
|---|---|
| Weight per 100 cc | 153.3 lb / 100 cc to 168.5 lb / 100 cc |
| Fuel weight as % of bike weight | 5.4% to 6.9% |
| Weight with full tank | 203.1 lb (92.1 kg) |
What the weight numbers tell you
Yamaha YZ125 weight FAQ
What does the Yamaha YZ125 weigh ready to ride?
The supplied figures span 207 lb (93.9 kg) to 209 lb (94.8 kg) for wet/running weight and 190 lb (86.2 kg) for dry weight across the years in this page. Wet weight is the better guide to what you actually manage on the road.
Is the Yamaha YZ125 heavy compared with other Yamaha motocross bikes?
It is on the lighter side in this dataset. Its representative wet weight sits around the 17th weight percentile among 15 Yamaha motocross bikes, meaning most compatible models are heavier.
Does the Yamaha YZ125 weight change by model year?
Not every covered year uses the same figure. The page groups identical values together and lists the later model years where the supplied weight specification changes.
How much does the Yamaha YZ125 fuel weigh?
The listed tank capacity is 1.8 US gal (6.81 L) to 2.11 US gal (8 L). Using approximately 0.745 kg/L gasoline, a full tank is roughly 11.2 lb (5.1 kg) to 13.1 lb (6 kg). That is an estimate for fuel mass, not an official Yamaha curb-weight calculation.
How heavy is the Yamaha YZ125 with an average-size rider?
A 180 lb rider brings the simple bike-plus-rider total to roughly 387.9 lb (175.9 kg) using the representative wet/running figure. Gear and luggage would add more.
What does the Yamaha YZ125 weigh with a full tank?
Filling the listed tank brings the calculated bike weight to roughly 203.1 lb (92.1 kg). This estimate is most useful when no official wet/running figure is available.
How much of the Yamaha YZ125 total weight comes from fuel?
Based on the available weight basis, a full tank of gasoline represents about 5.4% to 6.9% of the motorcycle’s weight.
What is the Yamaha YZ125 engine-size-to-weight ratio?
Engine displacement relative to bike weight is 0.59 cc per lb to 0.65 cc per lb. It can help compare motorcycles from very different displacement classes without relying on cc alone.
How far is the Yamaha YZ125 from the median Yamaha motocross bike weight?
The model sits about 23.1 lb (10.5 kg) lighter than the compatible median Yamaha motocross bike weight used on this page.
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.