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Yamaha Motorsports

2009 Yamaha Big Bear 400 IRS 4x4 ATV
Yamaha’s Working Man’s Machine Rallies in Muddy Conditions

Big Bear 400 4x4 IRS Black
Big Bear 400 4x4 IRS Black

Big Bear 400 4x4 IRS Blue
Big Bear 400 4x4 IRS Blue

Big Bear 400 4x4 IRS Camo
Big Bear 400 4x4 IRS Camo

Big Bear 400 4x4 IRS Green
Big Bear 400 4x4 IRS Green

CYPRESS, Calif. – June 6, 2008 – The 2009 Yamaha Big Bear 400 independent rear suspension (IRS) 4x4 is the latest in a long line of tough, trusted and dependable machines often looked to for long days of working and fun.

The Big Bear 400 features Yamaha’s proven air-cooled, torque-producing 386cc SOHC four-stroke engine with great low- to mid-range power.  The Mikuni 33mm BSR carburetor feeds the engine and offers excellent throttle response and great overall performance.

The popular five-speed semi-automatic transmission with reverse is one of the features that makes the Big Bear a favorite as it allows the rider to choose the best gear for the job and terrain ahead.  Another important feature – especially when hauling, towing or riding in muddy conditions – is the dual hydraulic brakes in the front and a high-tech sealed wet brake in the rear that provide consistent, long-lasting performance regardless of the conditions.  The rear brake system coupled with the 2WD/4WD push button On-Command® system and IRS make this one mean bear in the mud or through any tough terrain.

With 5.9 inches of travel up front and in the rear, riders will find a plush ride on this mean machine.  Both the front and rear feature independent double wishbone suspension with five-way preload adjustment allowing riders to choose the best setting -- especially useful when hauling a heavy load.  Overall, the Big Bear 400 offers 10.5 inches of ground clearance over tough trails and big ruts.

Other key features for muddy conditions include the ITP Mud Lite tires, high-mounted air-intake and full floorboards, which not only offer superior mud protection but also all day comfort.

The Big Bear 400 quickly reacts to rider input and can be maneuvered through tricky terrain.  The vehicle can also handle heavy loads towing up to 904 pounds via the center-mounted rear hitch.  But this bear doesn’t stop there; the Duragrip-coated steel racks are capable of carrying a total of 264 additional pounds (88 on the front and 176 on the back).

Riding comfort is an important factor in buying any ATV, and the Big Bear 400 treats its operator to a cushy ride with a specially designed padded seat, wide fenders and inner fender guards that help deflect mud and debris.  A large capacity 4-gallon fuel tank keeps it going strong on a long day, while a speedometer and odometer/trip meter allows enthusiasts to track their progress while either on the job or at play.  A mud-resistant DC outlet can power up cell phones and other portable electronic devices.

The 2009 Big Bear 400 IRS 4x4, with an MSRP of $5,799, is available in Hunter Green, Steel Blue and the new Black Metallic color at Yamaha dealerships nationwide in September 2008.  The Big Bear 400 IRS 4x4 will also be available in Realtree™ AP HD® Camouflage for $6,149 in June.


2009 Big Bear 400 IRS 4X4

  • Engine Type – 386cc, 4-Stroke Single, Air/Oil Cooler w/ Fan, SOHC
  • Bore x Stroke – 83mm x 71.5mm
  • Compression Ratio –8.6:1
  • Carburetion – Mikuni 33mm BSR
  • Ignition – DC – CDI
  • Starting System – Electric w/ Auxiliary Pull
  • Transmission – 5-Speed Automatic Clutch w/ Reverse
  • Engine Braking – Fr. & Rr. Wheel
  • Drive Train – Yamaha On-Command push button 3-way locking differential, 2WD, 4WD, locked 4WD; Shaft
  • Suspension/ Front – Independent Double Wishbone, 5.8” w/ 5-way Preload Adjustment.
  • Suspension/ Rear – Independent Double Wishbone, 7.6” w/ 5-way Preload Adjustment
  • Brakes/ Front – Dual Hydraulic Disc
  • Brake/ Rear – Fully Sealed , Oil Bath, Multi Disc
  • Tires/ Front – ITP Mud Lite 25x8-12
  • Tires/ Rear – ITP Mud Lite 25x10-12
  • LxWxH – 79.4”x 43.9”x 46.7”
  • Seat Height – 35.2”
  • Wheel Base – 48.4”
  • Turning Radius – 126”
  • Ground Clearance – 10.5”
  • Fuel Capacity – 4.0 Gallons
  • Dry Weight – 593 Lbs
  • Rack Capacity – 88 Lbs.Fr. / 176 Lbs. Rr.
  • Towing Capacity – 904 Lbs.
  • Instrumentation – Speedometer / Odometer & Fuel Gauge
  • Lighting – Dual 30W Krypton Multi-reflector Headlights & 21/5W Brake light

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