| Manufacturer | Yamaha |
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| Model | 2004 Yamaha Big Bear 400 4X2 |
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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 |
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| Towing | 904 lbs (410,0 kg) |
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| Price | 4399 |
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| Years Made | 2004 |
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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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| Primary Drive (Engine and Transmission) | Belt |
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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 |
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| No Of Driveline Modes | 1 |
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| Front Brake Type | Dual Hydraulic Disc |
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| Rear Brake Type | Sealed Drum |
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| Front Suspension Type | Independent Double Wishbone |
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| Rear Suspension Type | Swing Arm |
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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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| Tire Manufacturer | Dunlop |
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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 |
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| Rear Tire | AT25 x 10 – 12 |
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| Front Suspension Travel | 5.9 in (15,0 cm) |
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| Rear Suspension Travel | 5.9 in (15,0 cm) |
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| Rear Shock Qty | 1 |
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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 | 33.7 in (85,6 cm) |
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| No Of Seats | 1 |
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| Floor Board Location | Driver |
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| Light Type | Halogen |
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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 | 88 lbs (39,9 kg) |
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| Length | 79,0 in (200,6 cm) |
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| Width | 43.7 in (111,0 cm) |
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| Height | 46.1 in (117,1 cm) |
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| Wheelbase | 48.4 in (122,9 cm) |
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| Ground Clearance | 9.7 in (24,6 cm) |
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| Turning Radius | 117,6 in (298,7 cm) |
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| Dry Weight | 525 lbs (238,1 kg) |
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| Fuel Injector | No |
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| Carburetor | Yes |
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| Speed Governor | No |
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| Rear Unlocking Differential | No |
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| Rear Solid Axle | Yes |
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| Chromed | No |
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| Bash Plate (Front) | Yes |
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| Bash Plate (Rear) | 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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| A-Arm Skid Plate (Front) | Yes |
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| Headlight | Standard |
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| Hand Grips | Standard |
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| Underseat Storage | Standard |
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| Rear Hitch | Standard |
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| Speedometer | Standard |
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| Radiator Guard | No |
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| Metallic | No |
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| Shock Cover | No |
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