At the heart of the 2021 Yamaha FZ-X naked motorcycle, Yamaha utilizes a 149 cc (9.1 cu in) air-cooled single cylinder, four-stroke layout. In factory specification, peak output is rated at 12 HP (8.8 kW) at 7,250 rpm while maximum torque reaches 13.3 Nm (9.8 lb-ft) at 5,500 rpm, transferring power to the rear wheel through a 5-speed gearbox and chain final drive. With a specific output of 80.5 HP per liter and a 1,750 rpm working window between peak torque (5,500 rpm) and peak power (7,250 rpm), the engine character is indicating a tractable, stress-free state of tune focused on everyday usability and broad torque delivery.
On the scales, the FZ-X measures 139 kg (306 lbs) wet (curb), translating to a power-to-weight ratio of 0.09 HP/kg (11.58 kg per horsepower). Rider ergonomics and chassis geometry center around a 810 mm (31.9 in) seat height — offering a neutral standover height that accommodates most average-inseam riders without sacrificing cornering clearance, combined with a 1,330 mm (52.4 in) wheelbase engineered for quick, flickable steering geometry. The 10-liter (2.6 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Within MotoLibrary's Yamaha archive, this model family spans 3 indexed model years from 2021 to 2023, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Specific Output
80.5 HP/L
Power-to-Weight
0.09 HP/kg (11.58 kg/HP)
Power Band Window
5,500–7,250 rpm
Standover Height
810 mm (31.9 in)
Engine
Displacement149.0 ccm (9.09 cubic inches)
Engine TypeSingle cylinder, four-stroke
Power12.0 HP (8.8 kW)) @ 7250 RPM
Torque13.3 Nm (1.4 kgf-m or 9.8 ft.lbs) @ 5500 RPM
Compression9.6:1
Bore x Stroke57.3 x 57.9 mm (2.3 x 2.3 inches)
Valves/Cylinder2
Fuel SystemInjection
Fuel ControlSingle Overhead Cams (SOHC)
IgnitionTCI
LubricationForce-feed lubrication, wet sump
CoolingAir
Transmission
Gearbox5-speed
Final DriveChain (final drive)
ClutchWet, multiple-disc
Chassis
Rake25.0°
Trail101 mm (4.0 inches)
Front SuspensionTelescopic fork
Rear Suspension7-Step Adjustable Monocross
Wheelbase1330 mm (52.4 inches)
Ground Clearance165 mm (6.5 inches)
Wheels & Brakes
Front Tyre100/80-17
Rear Tyre140/60-17
Front BrakesSingle disc
Front Brake Ø282 mm (11.1 inches)
Rear BrakesExpanding brake (drum brake)
Rear Brake Ø220 mm (8.7 inches)
Dimensions & Weight
Weight incl.139.0 kg (306.4 pounds)
Seat Height810 mm (31.9 inches) If adjustable, lowest setting.
Overall Height1115 mm (43.9 inches)
Overall Length2020 mm (79.5 inches)
Overall Width785 mm (30.9 inches)
Fuel Capacity10.00 litres (2.64 US gallons)
Other
StarterElectric
Color OptionsMatte Copper, Matte Black, Metallic Blue
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.
