Positioned in Yamaha's enduro - offroad motorcycle lineup, the 2017 Yamaha YZ450FX features a 449.7 cc (27.4 cu in) liquid-cooled single cylinder, four-stroke configuration. Internal engine geometry specifies a bore and stroke of 97.0 x 60.8 mm (3.8 x 2.4 inches) with a 12.5:1 compression ratio.
On the scales, the YZ450FX measures 118.8 kg (262 lbs) wet (curb). Rider ergonomics and chassis geometry center around a 965 mm (38 in) seat height — reflecting a long-travel chassis stance that favors ground clearance and off-pavement control, combined with a 2 mm (0.1 in) wheelbase engineered for quick, flickable steering geometry. The 7.57-liter (2 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Within MotoLibrary's Yamaha archive, this model family spans 9 indexed model years from 2016 to 2026, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Standover Height
965 mm (38 in)
Engine
Displacement449.7 ccm (27.44 cubic inches)
Engine TypeSingle cylinder, four-stroke
Engine DetailsTitanium valves
Compression12.5:1
Bore x Stroke97.0 x 60.8 mm (3.8 x 2.4 inches)
Valves/Cylinder4
Fuel SystemInjection. Keihin 44mm
Fuel ControlDouble Overhead Cams/Twin Cam (DOHC)
IgnitionTCI
LubricationWet sump
CoolingLiquid
Transmission
Gearbox5-speed
Final DriveChain (final drive)
ClutchWet multi-disc
Chassis
Frame TypeAluminum Bilateral Beam frame
Rake28.0°
Front SuspensionKYB® spring-type fork with speed sensitive damping; fully adjustable
Front Travel310 mm (12.2 inches)
Rear SuspensionKYB® single shock; full adjustable
Rear Travel318 mm (12.5 inches)
Wheelbase2,164 mm (85.2 inches)
Ground Clearance335 mm (13.2 inches)
Wheels & Brakes
Front Tyre90/90-21
Rear Tyre120/90-18
Front BrakesSingle disc. Hydraulic
Front Brake Ø270 mm (10.6 inches)
Rear BrakesSingle disc. Hydraulic
Rear Brake Ø245 mm (9.6 inches)
Dimensions & Weight
Weight incl.118.8 kg (262.0 pounds)
Seat Height965 mm (38.0 inches) If adjustable, lowest setting.
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.
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.
