What category is the 1981 Yamaha XJ 400 Seca?

The 1981 Yamaha XJ 400 Seca has a Category of Naked bike.

What is the engine size of the 1981 Yamaha XJ 400 Seca?

The 1981 Yamaha XJ 400 Seca has a Capacity: of 398.00 ccm (24.29 cubic inches).

What type of engine does the 1981 Yamaha XJ 400 Seca have?

The 1981 Yamaha XJ 400 Seca has a Engine type of Four cylinder boxer.

What is the engine power of the 1981 Yamaha XJ 400 Seca?

The 1981 Yamaha XJ 400 Seca has a Power of 45.00.

What is the torque of the 1981 Yamaha XJ 400 Seca?

The 1981 Yamaha XJ 400 Seca has a Torque of 33.90.

Is the 1981 Yamaha XJ 400 Seca air cooled or liquid cooled?

The 1981 Yamaha XJ 400 Seca has a Cooling system of Air.

How many gears does the 1981 Yamaha XJ 400 Seca have?

The 1981 Yamaha XJ 400 Seca has a Gearbox of 6-speed.

How much does the 1981 Yamaha XJ 400 Seca weigh?

The 1981 Yamaha XJ 400 Seca has a Dry weight of 176.0 kg (388.0 pounds).

What is the top speed of the 1981 Yamaha XJ 400 Seca?

The 1981 Yamaha XJ 400 Seca has a Top speed of 162.5 km/h (101.0 mph).

Yamaha XJ 400 Seca - 1981 Specifications and Reviews

Name: 1981 Yamaha XJ 400 Seca
Brand: Yamaha
Rating: 3 (1 reviews)

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.

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1981

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General information
Category	Naked bike
Year	1981
Model	Yamaha XJ 400 Seca

Engine and Transmission Specifications
Transmission typefinal drive	Chain
Gearbox	6-speed
Cooling system	Air
Starter	Electric
Ignition	Battery Powered Inductive
Fuel control	DOHC
Fuel system	Carburettor. 2x34 Mikuni
Bore x stroke	51.0 x 48.8 mm (2.0 x 1.9 inches)
Compression	9.7:1
Torque	33.90
Power	45.00
Stroke	4
Engine type	Four cylinder boxer
Capacity:	398.00 ccm (24.29 cubic inches)
Physical measures and capacities
Dry weight	176.0 kg (388.0 pounds)
Yamaha XJ 400 Seca dimensions and frame
Rear brakes	Expanding brake (drum brake)
Front brakes	Single disc. 1 Piston Caliper
Rear tyre dimensions	110/90-18
Front tyre dimensions	-19
Rear suspension travel	96 mm (3.8 inches)
Rear suspension	Single Adjustable Spring Preload
Front suspension travel	142 mm (5.6 inches)
Front suspension	35mm Telescopic Forks

Speed and acceleration
Power/weight ratio	0.2557 HP/kg
1/4 mile (0.4 km)	14.000 seconds
Top speed	162.5 km/h (101.0 mph)
Other specs
Maintenance	Find parts, fluids, filters, maintenance tools and service items on eBay
Color options	Black

Performance Profile & Rider Fit

45 hp

Peak Power

6.5s

0-60 mph

101 mph

Top Speed

Best For

Track30%

City65%

Cornering55%

Daily Riding60%

Touring35%

Passenger40%

Rider Profile

Best For	A good fit for newer riders or those returning to biking who want a manageable, classic four-cylinder naked without intimidating power.
Purpose	Best suited to casual street riding, commuting, and weekend backroad rides rather than any specialized use.
Rider Fit	Its light dry weight and modest seat height make it approachable for riders of average or smaller stature.
Character	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.

Character map is an editorial estimate based on this bike's specifications, not a lab-tested measurement.