At the heart of the 2010 Yamaha Grizzly 450 Auto 4x4 IRS atv motorcycle, Yamaha relies on a 421 cc (25.7 cu in) liquid-cooled single cylinder, four-stroke powerplant. Internal engine geometry specifies a bore and stroke of 84.5 x 75.0 mm (3.3 x 3.0 inches) with a 10.0:1 compression ratio.
On the scales, the Grizzly 450 Auto 4x4 IRS measures 284.9 kg (628 lbs) wet (curb). Rider ergonomics and chassis geometry center around a 851 mm (33.5 in) seat height — reflecting a long-travel chassis stance that favors ground clearance and off-pavement control, combined with a 1,232 mm (48.5 in) wheelbase engineered for quick, flickable steering geometry. The 15.14-liter (4 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Within MotoLibrary's Yamaha archive, this model family spans 2 indexed model years from 2009 to 2010, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Standover Height
851 mm (33.5 in)
Engine
Displacement421.0 ccm (25.69 cubic inches)
Engine TypeSingle cylinder, four-stroke
Engine DetailsSingle cylinder, four-stroke
Compression10.0:1
Bore x Stroke84.5 x 75.0 mm (3.3 x 3.0 inches)
Fuel SystemCarburettor. Mikuni® 33mm BSR
Fuel ControlSingle Overhead Cams (SOHC)
IgnitionDC-CDI
CoolingLiquid
Transmission
GearboxAutomatic
Final DriveShaft drive (cardan) (final drive)
Chassis
Front SuspensionIndependent double wishbone
Front Travel127 mm (5.0 inches)
Rear SuspensionIndependent double wishbone
Rear Travel127 mm (5.0 inches)
Wheelbase1232 mm (48.5 inches)
Ground Clearance274 mm (10.8 inches)
Wheels & Brakes
Front Tyre25/8-AT12
Rear Tyre25/10-AT12
Front BrakesDouble disc
Rear BrakesSingle disc
Dimensions & Weight
Weight incl.284.9 kg (628.0 pounds)
Seat Height851 mm (33.5 inches) If adjustable, lowest setting.
Overall Length1994 mm (78.5 inches)
Fuel Capacity15.14 litres (4.00 US gallons)
Other
StarterElectric & kick
Color OptionsRealtree AP Camo, Hunter Green, Steel 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.
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.
