1981 Yamaha XS 650 specifications

Available technical data for this model and year. Specifications can vary by market and version.

Technical specifications

Displacement	654.0 ccm (39.91 cubic inches)
Engine type	Twin, four-stroke
Power	50.0 HP (36.5 kW )) @ 6800 RPM
Torque	54.0 Nm (5.5 kgf-m or 39.8 ft.lbs)
Compression	8.4:1
Bore x stroke	75.0 x 74.0 mm (3.0 x 2.9 inches)
Valves per cylinder	2
Fuel system	Carburettor
Fuel control	Overhead Cams (OHC)
Ignition	Induction coil
Cooling system	Air
Gearbox	5-speed
Transmission type	Chain (final drive)
Front suspension	Telescopic forks
Rear suspension	Dual shock absorbers
Front brakes	Double disc. Hydraulic.
Rear brakes	Expanding brake
Front tyre	3.50-19
Rear tyre	4.00-18
Dry weight	191.0 kg (421.1 pounds)
Weight incl. oil, gas, etc	225.0 kg (496.0 pounds)
Seat height	785 mm (30.9 inches) If adjustable, lowest setting.
Overall length	2175 mm (85.6 inches)
Ground clearance	153 mm (6.0 inches)
Wheelbase	1435 mm (56.5 inches)
Fuel capacity	15.00 litres (3.96 US gallons)
Top speed	171.0 km/h (106.3 mph)

Source: Bikez: XS 650, 1981. Retrieved 2026-09-19. Match confidence: exact.

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Years listed are the entries held in this archive, rather than a complete production history.