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Yamaha Motorsports

2008 Big Bear 400 IRS 4x4

Reliable and rugged for riders who prefer shifting, now with ITP MudLite tires, IRS and sealed wet brake.

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

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

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

Big Bear 400 IRS 4x4 Red
Big Bear 400 IRS 4x4 Red

Key Features:

  • Potent, 386cc air-/oil-cooled, SOHC four-stroke single delivers reliable, class-leading low-end and midrange power to tackle the hardest chores and toughest trails.
  • Independent rear suspension for excellent terrainability and all-day comfort.
  • Class-exclusive, pushbutton On-Command® with Diff Lock makes switching from 2WD to 4WD to 4WD Diff Lock a snap.
  • Constant-mesh five-speed transmission with automatic clutch, reverse and super-low stump-pulling first gear means this is one hard-working ATV.
  • Sealed wet brake out back provides long-lasting, consistent stopping power in even the harshest conditions.
  • Full floorboards and high ground clearance keep the rider high and as dry as possible.
  • Number-one-selling aftermarket ITP Mud Lite tires make the Big Bear 400 an excellent mud machine.
  • Pushbutton electric starting in any gear is backed up by an auxiliary recoil starter.


  • Simple yet powerful 386cc air-/oil-cooled, SOHC engine inhales through a heated, semi-oval slide 33mm BSR Mikuni carburetor for seamless throttle response and excellent all-weather performance.
  • DC-CDI ignition system ensures dependable starting and puts out consistent spark at all rpm for optimal engine performance.
  • Large-capacity oil cooler with cooling fan helps maximize engine efficiency, even under heavy loads.
  • Stainless steel muffler and header provide superior power characteristics, exhaust sound and unmatched durability.
  • Easy-access, tool-free air filter box.
  • Automatic cam chain tensioner reduces engine maintenance and helps extend engine life.


  • Special, compact frame design uses fewer components to reduce weight and provide lighter steering, a tighter turning radius and superior durability.
  • Class-leading turning radius provides maximum maneuverability on tight trails and while working with heavy equipment.
  • Independent rear suspension makes this one super-comfortable, while it makes even more terrain accessible.
  • High-tech sealed wet brake provides consistent, long-lasting braking performance in hostile environments.
  • On-Command drive selection with Diff Lock lets you access full power from 4WD locked.
    Low seat height creates enhanced handling.
  • Plenty of ground clearance means superb terrainability.
  • Independent double-wishbone front suspension with five-way preload-adjustable shocks and 5.8 inches of travel.
  • Large-diameter ventilated hydraulic front disc brakes and a sealed rear wet brake provide plenty of stopping power in a variety of conditions.
  • Reliable, low-maintenance front and rear shaft drive.
  • Huge 25x8-12 front and 25x10-12 rear ITP Mud Lite tires further boost ground clearance while providing great handling and traction.
  • Specially designed A-arms with removable ball joints ensure smooth operation and outstanding reliability.

Additional Features:

  • Wrinkle-finish cargo racks are super-durable and can pack a class-leading total of 264 pounds (88 front, 176 rear) of payload.
  • Speedometer with odometer/tripmeter adds greater versatility and allows rider to keep track of engine maintenance intervals.
  • Standard, center-mounted trailer hitch can hook up over 900 pounds of payload.
  • Full floorboards, lots of ground clearance and a high-mount air intake are ready for mud.
  • ITP Mud Lite tires serve up amazing traction.
  • Flat-style handlebars help lighten steering effort and deliver greater rider comfort.
  • Large front and rear fenders with inner splash guards offer excellent mud and splash protection.
  • Large-capacity, 4-gallon fuel tank has a built-in gauge.
  • Water-resistant, large-capacity underseat storage box provides added convenience.
  • Heavy-duty, full-coverage A-arm and CV joint boot protectors help prevent damage to boot covers.
  • Specially designed, thickly padded seat is widely contoured for incomparable rider comfort.
  • Mud-/water-resistant automotive-type DC power outlet powers a wide range of accessories.
  • Rugged, serrated footrests provide excellent grip and rider comfort with superb durability.
  • Maintenance-free 18-amp-hour battery provides extra starting power.
  • Underseat marine-spec electrical components ensure maximum protection from the elements and easy access.
  • Bright multi-reflector 30-watt headlights feature wide positioning to maximize low-light and nighttime visibility.
  • Easy-to-use, handlebar-mounted parking brake and choke lever.
  • Built in Newnan, GA, USA.



  • Type 386cc, 4-stroke, air-/oil-cooled single; SOHC
  • Bore x Stroke 83.0mm x 71.5mm
  • Compression Ratio 8.6:1
  • Carburetion Mikuni 33mm BSR
  • Ignition DC-CDI
  • Starting System Electric w/auxiliary pull
  • Transmission 5-speed w/reverse; automatic clutch; front- and rear-wheel engine braking
  • Engine Braking Front and rear wheel
  • Drive Train Yamaha On-Command® pushbutton; 3-way locking differential; 2WD, 4WD, locked 4WD; shaft drive


  • Suspension/Front Independent double wishbone; 5-way preload adjustment, 5.8-in travel
  • Suspension/Rear Independent double wishbone; 5-way preload adjustment, 7.6-in travel
  • Brakes/Front Dual hydraulic discs
  • Brakes/Rear Sealed wet brake
  • Tires/Front AT25x8-12 ITP Mud Lite
  • Tires/Rear AT25x10-12 ITP Mud Lite


  • L x W x H 79.4 x 43.9 x 46.7 in
  • Seat Height 35.2 in
  • Wheelbase 48.4 in
  • Turning Radius 126 in
  • Ground Clearance 10.5 in
  • Fuel Capacity 4.0 gal
  • Dry Weight 593 lbs
  • Rack Capacity 88 lb Fr./176 lb Rr.
  • Towing Capacity 904 lb


  • Instrumentation Speedometer, odometer & fuel gauge
  • Lighting Dual 30W Krypton multi-reflector headlights & 21/5W brakelight

MSRP* $5,699 (Steel Blue) Available from June 2007
$5,699 (Hunter Green) Available from June 2007
$5,699 (Red) Available from June 2007
$6,049 (Realtree® AP HD™ Camouflage) Available from August 2007

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