At the heart of the 2021 Kawasaki Z650 Performance naked motorcycle, Kawasaki features a 649 cc (39.6 cu in) liquid-cooled twin, four-stroke configuration. In factory specification, peak output is rated at 67.3 HP (49.1 kW) at 8,000 rpm while maximum torque reaches 64 Nm (47.2 lb-ft) at 6,700 rpm, transferring power to the rear wheel through a 6-speed gearbox and chain final drive. With a specific output of 103.7 HP per liter and a 1,300 rpm working window between peak torque (6,700 rpm) and peak power (8,000 rpm), the engine character is reflecting a performance-oriented street tune that balances strong mid-range pull with an energetic top-end rush.
On the scales, the Z650 Performance measures 188 kg (414 lbs) wet (curb), translating to a power-to-weight ratio of 0.36 HP/kg (2.79 kg per horsepower). Rider ergonomics and chassis geometry center around a 790 mm (31.1 in) seat height — offering a neutral standover height that accommodates most average-inseam riders without sacrificing cornering clearance, combined with a 1,410 mm (55.5 in) wheelbase engineered for quick, flickable steering geometry. The 15-liter (4 US gal) fuel tank paired with a rated consumption of 4.3 L/100 km provides an estimated theoretical range of roughly 349 km (217 miles) between fill-ups.
Within MotoLibrary's Kawasaki archive, this model family spans 2 indexed model years from 2021 to 2025, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Specific Output
103.7 HP/L
Power-to-Weight
0.36 HP/kg (2.79 kg/HP)
Power Band Window
6,700–8,000 rpm
Theoretical Range
~349 km (217 mi)
Engine
Displacement649.0 ccm (39.60 cubic inches)
Engine TypeTwin, four-stroke
Engine DetailsDie-cast aluminium cylinder and lightweight coated pistons
Power67.3 HP (49.1 kW)) @ 8000 RPM
Torque64.0 Nm (6.5 kgf-m or 47.2 ft.lbs) @ 6700 RPM
Compression10.8:1
Bore x Stroke83.0 x 60.0 mm (3.3 x 2.4 inches)
Fuel SystemInjection. DFI® with Keihin 36mm Keihin throttle bodies
Fuel ControlDouble Overhead Cams/Twin Cam (DOHC)
IgnitionTCBI with electronic advance
LubricationForced lubrication, semi and #8209;dry sump
CoolingLiquid
Transmission
Gearbox6-speed
Final DriveChain (final drive)
ClutchAssist and Slipper Clutch
DrivelineSealed chain
Performance
Fuel Consumption4.30 litres/100 km (23.3 km/l or 54.70 mpg)
Greenhouse Gases99.8 CO2 g/km. (CO2 - Carbon dioxide emission)
Chassis
Frame TypeTrellis, high-tensile steel
Rake24.0°
Trail100 mm (3.9 inches)
Front Suspension41 mm telescopic fork
Front Travel124 mm (4.9 inches)
Rear SuspensionHorizontal Back-link with preload adjustment
Rear Travel130 mm (5.1 inches)
Wheelbase1410 mm (55.5 inches)
Ground Clearance130 mm (5.1 inches)
Wheels & Brakes
Front Tyre120/70-ZR17
Rear Tyre160/60-ZR17
Front BrakesDouble disc. Petal-type rotors with two-piston calipers. Optional ABS.
Use this page to compare this motorcycle by its real specifications, not only by model name. Focus on the details that affect fit, comfort, handling, range and ownership.
Power
Compare engine output with similar motorcycles if acceleration, highway use or two-up riding matters.
Torque
Torque is useful for judging real-world pull, especially for touring, commuting and loaded riding.
Seat Height
Check the seat height against your inseam and riding posture before choosing a motorcycle.
Fuel Capacity
Fuel capacity helps estimate touring range and how often you may need to stop.
Brakes
Brake setup is worth comparing if you ride in traffic, mountains or with a passenger.
Suspension
Suspension details can matter for comfort, road feel and long-distance riding.
Transmission
Transmission and final drive affect maintenance, smoothness and everyday usability.
