Naked Motorcycles
1981Yamaha XJ 400 Seca
26 fields on record
The 1981 Yamaha XJ 400 Seca is a lightweight naked bike ideal for beginner and commuter riders seeking affordable, reliable transportation. Its air-cooled four-cylinder engine delivers smooth, predictable power with excellent fuel efficiency. The bike is best known for its accessible handling characteristics and practical everyday usability.
- Capacity
- 398.0 ccm
- Engine
- Boxer
- Gearbox
- 6-speed
- Dry weight
- 176.0 kg
- Seat height
- Not on record
Know it? Add it → - Power
- 45.0 HP (33.1 kW)
How it rides
Editorial estimate from the spec sheet - not lab tested- Best for
- Best suited to casual street riding, commuting, and weekend backroad rides rather than any specialized use.
- Built for
- A friendly, revvy air-cooled four with an eager but modest top end, rewarding smooth throttle use over outright speed.
- Not ideal for
- Not a good choice for riders seeking modern touring comfort, long highway hauls, or any off-road capability.
Scores are derived from the spec sheet using the same model across every bike, so they compare like for like.
Engine
- Capacity
- 398.0 ccm
- Power
- 45.0 HP (33.1 kW)
- Torque
- 33.9 Nm (3.5 kgf-m)
- Engine type
- Boxer
- Power/weight ratio
- 0.2557 HP/kg (dry)
- Bore x stroke
- 51.0 x 48.8 mm
- Compression
- 9.7:1
- Cooling system
- Air
- Fuel system
- Carburettor
- Starting
- Electric
- Ignition
- Battery Powered Inductive
Transmission
- Gearbox
- 6-speed
- Transmission type
- Manual
- Final drive
- Chain
Performance
- Top speed
- 162.5 km/h (101.0 mph)
Dimensions & weight
- Dry weight
- 176.0 kg
- Seat height
- Not on record - add it
Chassis & suspension
- Front suspension
- 35mm Telescopic Forks
- Rear suspension
- Single Adjustable Spring Preload
- Front wheel travel
- 142 mm
- Rear wheel travel
- 96 mm
Brakes & wheels
- Front brakes
- Single disc. 1 Piston Caliper
- Rear brakes
- Expanding brake (drum brake)
- Front tyre
- -19
- Rear tyre
- 110/90-18
Other
- Color options
- Black
Compiled from manufacturer documentation and user contributions, corrected on an ongoing basis. Spotted something wrong? Tell us.
Rider Reviews
Common questions
What is the engine size of the Yamaha XJ 400 Seca?
The 1981 Yamaha XJ 400 Seca has a Capacity of 398.0 ccm (24.29 cubic inches).
What engine power does the Yamaha XJ 400 Seca have?
The 1981 Yamaha XJ 400 Seca has a Power of 45.0 HP (33.1 kW).
How many gears does the Yamaha XJ 400 Seca have?
The 1981 Yamaha XJ 400 Seca has a Gearbox of 6-speed.
What is the torque of the Yamaha XJ 400 Seca?
The 1981 Yamaha XJ 400 Seca has a Torque of 33.9 Nm (3.5 kgf-m or 25.0 ft.lbs).
How much does the Yamaha XJ 400 Seca weigh?
The 1981 Yamaha XJ 400 Seca has a Dry weight of 176.0 kg (388.0 pounds).
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