Motorcycles Specs > Yamaha > Yamaha Big Bear 400 4x4 IRS

Yamaha Big Bear 400 4x4 IRS Specs

The Yamaha Big Bear 400 4x4 IRS model is a ATV bike manufactured by Yamaha . In this version sold from year 2012 , the dry weight is  and it is equiped with a Single cylinder, four-stroke motor. The engine produces a maximum peak output power of  and a maximum torque of  . With this drive-train, the Yamaha Big Bear 400 4x4 IRS is capable of reaching a maximum top speed of  . Regarding the chassis characteristics, responsible for road holding, handling behaviour and ride confort, the Yamaha Big Bear 400 4x4 IRS have a  frame with front suspension being Independent double wishbone and in the rear suspension it is equiped with Independent double wishbone . Stock tire sizes are 25/8-12 on the front, and 25/10-12 on the rear. As for stopping power, the Yamaha Big Bear 400 4x4 IRS braking system includes Double disc. Hydraulic size  at the front and Sealed multidisc size  at the rear. 

Yamaha Big Bear 400 4x4 IRS General Information

Brand Yamaha 
Model Yamaha Big Bear 400 4x4 IRS 
Start year 2012 
Year 2012 
Category ATV 
Factory Warranty (Years / miles) 6 Month (Limited Factory Warranty) 

Yamaha Big Bear 400 4x4 IRS Dimensions, Aerodynamics and weight

Frame type
Seat details
Wheelbase 1,229 mm (48.4 inches) 
Length 2,017 mm (79.4 inches) 
Height 1,186 mm (46.7 inches) 
Seat Height 894 mm (35.2 inches) If adjustable, lowest setting. 
Alternate Seat Height
Ground Clearance 267 mm (10.5 inches) 
Trail size
Wheels details
Front Tyres - Rims dimensions 25/8-12 
Rear Tyres - Rims dimensions 25/10-12 
Front brakes Double disc. Hydraulic 
Rear brakes Sealed multidisc 
Front Brakes Dimensions - Disc Dimensions
Rear Brakes Dimensions - Disc Dimensions
Curb Weight (including fluids) 284.9 kg (628.0 pounds) 
Dry Weight
Front Percentage of Weight
Rear Percentage of Weight
Weight-Power Output Ratio :
Fuel Tank Capacity 15.14 litres (4.00 gallons) 
Reserve Fuel Capacity
Carrying Details and Capacity
Front Suspension Independent double wishbone 
Front Suspension Travel 147 mm (5.8 inches) 
Rear Suspension Independent double wishbone 
Rear Suspension Travel 193 mm (7.6 inches) 

Yamaha Big Bear 400 4x4 IRS Engine and Transmission Technical Data

Engine type - Number of cylinders Single cylinder, four-stroke 
Engine details
Fuel system Carburettor. Mikuni 33mm BSR 
Engine size - Displacement - Engine capacity 386.00 ccm (23.55 cubic inches) 
Bore x Stroke 83.0 x 71.5 mm (3.3 x 2.8 inches) 
Compression Ratio 8.6:1 
Number of valves per cylinder
Camshaft Valvetrain Configuration SOHC 
Maximum power - Output - Horsepower
Maximum torque
Engine Maximum RPM
Cooling system Oil & air 
Lubrication system
Engine oil capacity
Exhaust system
Gearbox 5-speed 
Transmission type, final drive ratio Shaft drive (cardan) 
Clutch type
Driveline Yamaha On-Command pushbutton; 3-way locking differential; 2WD, 4WD, locked 4WD; shaft drive 

Yamaha Big Bear 400 4x4 IRS Performance

Top Speed
Acceleration 0 to 100 km/h (0 to 62 mph)
Acceleration 0 to 400m (1/4 mile)
Recuperation 60 to 140 km/h in highest gear
Fuel Consumption - MPG - Economy - Efficiency
CO2 emissions

Yamaha Big Bear 400 4x4 IRS Electrical Systems, Ignition and Equipment

Ignition Type DC-CDI 
Electrical Details
Starter Type Electric 
Instruments Speedometer, odometer and fuel gauge 
Lights Dual 30W Krypton multireflector headlights and 21/5W brakelight 
How tall (seat height) is a Yamaha Big Bear 400 4x4 IRS?
The Yamaha Big Bear 400 4x4 IRS seat height is 894 mm (35.2 inches) If adjustable, lowest setting.