Across 5 covered model years from 1978 to 1982, the Yamaha XS 400 motorcycle has supplied wet/running weights ranging from 401.2 lb (182 kg) and dry weights ranging from 372.6 lb (169 kg), depending on model year.
Yamaha XS 400 weight overview
The bike falls into a normal middleweight range. At road speed the mass is usually less obvious; parking, slopes and walking-speed maneuvers are where you notice it most.
Middleweight Motorcycle
How heavy is the Yamaha XS 400?
wet weight
Using a model-level wet weight comparison, the Yamaha XS 400 is heavier than about 66.2% of 34 Yamaha classic motorcycles 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 XS 400 weight & related specs
| Model years covered | 1978, 1979, 1980, 1981, 1982 |
|---|---|
| Wet / running weight | 401.2 lb (182 kg) |
| Dry weight | 372.6 lb (169 kg) |
| Engine displacement | 392 cc |
| Power | 27 hp |
| Torque | 23 lb-ft (31.2 Nm) |
| Fuel capacity | 4.49 US gal (17 L) |
| Full-tank fuel weight (estimated) | 27.9 lb (12.7 kg) |
Weight changes by model year
Useful weight calculations
| Horsepower per 100 lb | 6.73 hp / 100 lb |
|---|---|
| Pounds per horsepower | 14.86 lb / hp |
| Torque per 100 lb | 5.74 lb-ft / 100 lb |
| Displacement per pound | 0.98 cc / lb |
| Weight per 100 cc | 102.4 lb / 100 cc |
| Fuel weight as % of bike weight | 7% |
| Weight with full tank | 400.5 lb (181.7 kg) |
What the weight numbers tell you
Yamaha XS 400 weight FAQ
What is the Yamaha XS 400 dry and wet weight?
Across the covered 1978-1982 years, listed wet/running weight is 401.2 lb (182 kg) and listed dry weight is 372.6 lb (169 kg). Check the year-change section because the exact figure can vary by model year.
Is the Yamaha XS 400 lighter or heavier than other Yamaha classic motorcycles?
Compared with similar Yamahas in this dataset, it is heavier than about 66.2% of 34 classic motorcycles using the same weight basis.
Which Yamaha XS 400 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 XS 400?
Based on the supplied 4.49 US gal (17 L) tank capacity, the gasoline itself weighs about 27.9 lb (12.7 kg) when full. This helps explain part of the difference between dry and ready-to-ride mass.
What is the combined Yamaha XS 400 and rider weight?
Using the model’s representative wet/running weight and a 180 lb rider, the combined bike-and-rider mass is about 581.2 lb (263.6 kg) before riding gear, luggage or a passenger.
What is the Yamaha XS 400 power-to-weight ratio?
Available model-year data produces 6.73 hp per 100 lb. It shows engine output relative to motorcycle mass rather than just quoting peak horsepower. That places it around the 19th percentile within the compatible Yamaha classic power-to-weight comparison.
What does the Yamaha XS 400 weigh with a full tank?
Filling the listed tank brings the calculated bike weight to roughly 400.5 lb (181.7 kg). This estimate is most useful when no official wet/running figure is available.
How much weight do fuel and fluids add to the Yamaha XS 400?
Where both figures are available, the listed wet-versus-dry difference is about 28.7 lb (13 kg). That gap reflects fuel and operating fluids, plus any differences in how the source defines dry and running weight.
How much of the Yamaha XS 400 total weight comes from fuel?
The calculated full-tank fuel mass is about 7% of the bike’s listed weight. This helps show why a dry-weight number can understate what you actually manage on the road.
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.