For the 1981 model year, the Yamaha XJ 400 Seca motorcycle has a listed dry weight of 388 lb (176 kg).
Yamaha XJ 400 Seca weight overview
This is neither unusually light nor extremely heavy. For most riders the practical weight question is more about seat height, center of mass and low-speed balance than the scale number alone. The comparison uses dry weight because a usable wet/running figure was not supplied, so the actual ready-to-ride motorcycle will be heavier.
Middleweight Motorcycle
How heavy is the Yamaha XJ 400 Seca?
dry weight
Using a model-level dry weight comparison, the Yamaha XJ 400 Seca is lighter than about 82.4% of 17 Yamaha naked bikes with compatible weight data.
Dry weight
Bike + rider total weight
These totals use the model’s representative dry weight. They exclude riding gear, luggage and a passenger.
Yamaha XJ 400 Seca weight & related specs
| Model years covered | 1981 |
|---|---|
| Dry weight | 388 lb (176 kg) |
| Engine displacement | 398 cc |
| Power | 45 hp |
| Torque | 25 lb-ft (33.9 Nm) |
Useful weight calculations
| Horsepower per 100 lb | 11.6 hp / 100 lb |
|---|---|
| Pounds per horsepower | 8.62 lb / hp |
| Torque per 100 lb | 6.44 lb-ft / 100 lb |
| Displacement per pound | 1.03 cc / lb |
| Weight per 100 cc | 97.5 lb / 100 cc |
What the weight numbers tell you
Yamaha XJ 400 Seca weight FAQ
How heavy is the Yamaha XJ 400 Seca?
Listed dry weight is 388 lb (176 kg). Because no usable wet/running figure was supplied, treat that as a lower starting point rather than the exact on-road weight.
Is the Yamaha XJ 400 Seca heavy compared with other Yamaha naked bikes?
It is on the lighter side in this dataset. Its representative dry weight sits around the 18th weight percentile among 17 Yamaha naked bikes, meaning most compatible models are heavier.
How heavy is the Yamaha XJ 400 Seca with an average-size rider?
A 180 lb rider brings the simple bike-plus-rider total to roughly 568 lb (257.6 kg) using the representative dry figure. Gear and luggage would add more.
How much horsepower does the Yamaha XJ 400 Seca have per 100 lb?
Where compatible power and weight figures are available, it works out to 11.6 hp per 100 lb. That places it around the 6th percentile within the compatible Yamaha naked bike power-to-weight comparison.
Can I treat the Yamaha XJ 400 Seca dry weight as curb weight?
No. Dry weight excludes at least some operating fluids, so the actual ready-to-ride motorcycle will weigh more.
How much torque does the Yamaha XJ 400 Seca have per 100 lb?
The calculated torque-to-weight range is 6.44 lb-ft per 100 lb. It is useful for comparing bikes with very different overall weights.
What is the Yamaha XJ 400 Seca displacement per pound?
Engine displacement relative to bike weight is 1.03 cc per lb. It can help compare motorcycles from very different displacement classes without relying on cc alone.
What is the Yamaha XJ 400 Seca weight difference versus the category median?
The model sits about 27.6 lb (12.5 kg) lighter than the compatible median Yamaha naked bike weight used on this page.
Will the Yamaha XJ 400 Seca feel heavy at low speed?
It is most likely to feel heavy while stopped, backing up or on a slope rather than once settled at normal riding speed. Seat height and center of gravity matter a lot.
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.