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Yamaha Motorsports

2007 Big Bear 400 IRS 4X4

All-New 2007 Big Bear 400 5-Speed 4x4 IRS
Proven Durability and a Heap of Extras

Big Bear 400 IRS Blue
Big Bear 400 IRS Blue

Big Bear 400 IRS Camo
Big Bear 400 IRS Camo

Big Bear 400 IRS Green
Big Bear 400 IRS Green

Big Bear 400 IRS Red
Big Bear 400 IRS Red

Big Bear 400 IRS Blue
Big Bear 400 IRS EE Blue

The Big Bear has long been a mainstay in the Yamaha utility ATV line up offering riders the option of not only selecting when 4WD was required, but also what gear was best for their usage – either fun or work. Many Big Bear fans are also “fans” of the mud whether they are seeking it out for fun or that’s what their property offers up. The Big bear has always been a leader in the mud category, but we can all agree that the additions of independent rear suspension (IRS), fully-locking differential and a host of other mud-friendly updates will take the 2007 Big Bear to the next level.

For 2007, the Big Bear 400 features the proven air-cooled, torque-producing 386cc SOHC four-stroke engine with great low- to mid-range power, which riders know and love. 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 continues for as do the dual hydraulic brakes in the front. However, for 2007 the rear brakes get an update – a high-tech sealed wet brake in the rear provides consistent, long-lasting performance regardless of the conditions. The new rear brake system coupled with the addition of diff lock to 2WD/4WD the On-Command® system and the all-new IRS make this one mean bear in the mud or through any nasty terrain you may stumble upon during your travels.

For 2007 the addition of the IRS system on the Big Bear means a more terrainable bear overall. The travel of the IRS system now matches that of the independent suspension up front – 5.9 inches. Both feature independent double wishbone suspension with five-way preload adjustment allowing riders to choose the setting that’s best for them, especially if they are hauling a heavy load. And, the IRS system means better overall ground clearance of XX more than XX inches than the previous Big Bear.

Of course, if mud is what your after, you’ll also appreciate the all-new ITP Mud Lite tires, high-mounted air-intake and all-new full floorboards, which not only offer superior mud protection, but also all day comfort.

All of these additions mean one great handling bear not only in the mud but also on tight trails. The Big Bear 400 quickly reacts to rider input and can maneuver through some of the trickiest terrain around. Even on wide-open trails, you’ll appreciate the handling, especially if you are towing loads of up to 904 lbs. via the center-mounted rear hitch. The Big Bear can haul even more thanks to Duragrip-coated steel racks, which are capable of carrying a total of 264 additional lbs. (88 lbs. front, 176 lbs. in the rear). Plush suspension gives the bear an amazing 9.7” of ground clearance to make overcoming obstacles a breeze.

Riding comfort is an important factor in buying any ATV, and the Big Bear 400 5-Speed 4x4 IRS treats its operator to a cushy ride with a specially designed padded seat, wide fenders and inner fender guards that help keep mud and debris off the rider. A large capacity 4-gallon tank keeps it going strong all day long, 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 brings along the comforts of home to power up cell phones and other portable electronic devices.

The 2007 Big Bear 400 5-Speed 4x4 IRS is available in Hunter Green, Steel Blue and Red at Yamaha dealerships nationwide starting October 2006. For 2007 the Big Bear 400 5-Speed 4x4 IRS will also be available in Realtree Hardwoods® High Definition Camouflage in October 2006.

As if all these updates weren’t enough, the 2007 Big Bear 400 5-Speed 4x4 IRS will also come in an Exploring Edition. The Exploring Edition will feature overfenders for additional mud protection, plastic hand guards, a rear rack extender and front rack bag aboard a Steel Blue machine. The Exploring Editions will hit Yamaha dealerships in October 2006.


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 2WD, 4WD ; Shaft

Suspension/ Front – Independent Double Wishbone, 5.9” w/ 5-way Preload Adjustment.
Suspension/ Rear – Independent Double Wishbone, N/A” 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 – N/A

Seat Height – N/A

Wheel Base – N/A

Turning Radius – N/A

Ground Clearance – N/A

Fuel Capacity – 4.0 Gallons

Dry Weight – N/A 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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