| Manufacturer | Yamaha |
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| Model | 2009 Yamaha Big Bear 400 Irs 5-Speed 4X4 |
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| Type | Sport ATV |
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| Fuel | Gasoline |
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| Transmission | Manual (Automatic Clutch) |
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| Drive | 4X2 or 4X4 |
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| Towing | 904 lbs (410,0 kg) |
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| Price | 6099 |
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| Years Made | 2009 |
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| Recommend Min. Age | 16 |
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| Factory | Japan |
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| Engine Type | Single-Cylinder |
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| Cooling System | Air cooled |
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| Fuel Type | Gasoline |
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| No of Cylinders | 1 |
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| No of Valves | 2 |
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| Valve Configuration | SOHC |
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| Combustion | Carburetor |
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| No Of Carburetors | 1 |
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| Carburetion Manufacturer | Mikuni |
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| Carburetor Size | 1,3 in (3,3 cm) |
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| Starter | Electric and Pull |
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| Compression Ratio | 8.6:1 |
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| Displacement | 23.6 cu in (386,7 cc) |
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| Engine Stroke | Four Stroke |
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| Stroke | 2.82 in (7,2 cm) |
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| Bore | 3.27 in (8,3 cm) |
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| Fuel Capacity | 4 gal (15,1 l) |
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| Transmission Type | Manual (Automatic Clutch) |
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| Primary Drive (Rear Wheel) | Shaft |
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| No Of Speeds | 5 |
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| Reverse | Yes |
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| High-Low Range | No |
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| Driveline Type | 4X2 or 4X4 |
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| Driveline Manufacturer | On-Command |
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| No Of Driveline Modes | 2 |
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| Front Brake Type | Dual Hydraulic Disc |
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| Rear Brake Type | Sealed Oil Bath |
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| Front Suspension Type | Independent Double Wishbone |
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| Rear Suspension Type | Independent Double Wishbone |
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| Front Central Suspension Strut | No |
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| Rear Suspension Material | Steel |
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| Steering Type | Manual |
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| Steering Control | Handlebar |
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| Steering Damper | No |
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| Wheels Composition | Steel |
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| Front Tire Diameter | 25 in (63,5 cm) |
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| Rear Tire Diameter | 25 in (63,5 cm) |
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| Front Tire Width | 8 |
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| Front Wheel Diameter | 12 |
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| Rear Tire Width | 10 |
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| Rear Wheel Diameter | 12 |
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| Front Tire | AT25 x 8 – 12 ITP Mud Lite |
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| Rear Tire | AT25 x 10 – 12 ITP Mud Lite |
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| Front Suspension Travel | 5.8 in (14,7 cm) |
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| Rear Suspension Travel | 7.6 in (19,3 cm) |
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| Rear Shock Qty | 2 |
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| Seat Type | One-Piece |
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| Seat Material | Vinyl |
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| Seat Position | Driver |
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| Seat Height | 35.2 in (89,4 cm) |
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| No Of Seats | 1 |
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| Foot Peg Location | Driver |
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| Floor Board Location | Driver |
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| Fuel Level Warning Type | Gauge |
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| Temperature Warning Type | Light |
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| Frame | Steel |
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| Body Material | Plastic |
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| Towing Capacity | 904 lbs (410,0 kg) |
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| Storage Capacity | 176 lbs (79,8 kg) |
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| Length | 79.4 in (201,7 cm) |
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| Width | 43.9 in (111,5 cm) |
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| Height | 46.7 in (118,6 cm) |
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| Wheelbase | 48.4 in (122,9 cm) |
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| Ground Clearance | 10.5 in (26,7 cm) |
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| Turning Radius | 126,0 in (320,0 cm) |
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| Dry Weight | 593 lbs (269,0 kg) |
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| Tongue Weight | 900 lbs (408,2 kg) |
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| Fuel Injector | No |
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| Carburetor | Yes |
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| Engine | Standard |
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| Carburetion | Standard |
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| Engine Braking | Standard |
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| Speed Governor | No |
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| Rear Unlocking Differential | No |
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| Rear Solid Axle | No |
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| Brakes | Standard |
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| Wheels | Standard |
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| Tires | Standard |
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| Chromed | No |
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| Exterior Covers | Standard |
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| Bash Plate (Front) | Yes |
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| Bash Plate (Rear) | Yes |
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| Brush Guard | Yes |
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| Front Fender | Standard |
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| Rear Fender | Standard |
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| Front Bumper | Standard |
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| Front Fender Flairs | Optional |
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| Rear Fender Flairs | Optional |
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| Exterior Guards | Standard |
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| Skid Plate | Standard |
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| A-Arm Skid Plate (Front) | Yes |
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| A-Arm Skid Plate (Rear) | No |
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| CV Boot Cover | Yes |
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| Swing Arm Skid Plate | No |
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| Headlight | Standard |
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| Fog Lights | Optional |
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| Hand Grips | Standard |
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| Underseat Storage | Standard |
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| Seat Specifications | Standard |
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| Windshield Mounts | Optional |
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| Fender Storage | Optional |
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| Rear Hitch | Standard |
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| Rear Rack | Standard |
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| Front Rack | Standard |
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| Storage Cover | Optional |
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| Gun Scabbard | Optional |
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| Gun Scabbard Mount | Optional |
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| Plow Mount | Optional |
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| Rear Rack Storage | Optional |
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| Rack Rails | Optional |
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| Map Holder | Optional |
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| Speedometer | Standard |
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| Hour Meter | Optional |
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| Temperature Warning | Standard |
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| Type Lights | Halogen |
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| Radiator Guard | No |
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| Windshield | Optional |
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| Paint | Standard |
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| Power Outlet | Standard |
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| Service Reminder | Optional |
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| Shock Cover | No |
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| Roller Fairlead | Optional |
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| Snorkel Air Intake | Standard |
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| Digital Instrumentation | Optional |
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| Foot Pegs | Standard |
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