| Attribute | Value |
| General |
| Production from | 2010 year |
| Make | Yamaha |
| Model | Yamaha Big Bear 400 4x4 IRS |
| Category | ATV |
| Engine and transmission |
| Engine type | Single cylinder, four-stroke |
| Valves per cylinder | Add |
| Fuel system | Carburettor. Mikuni® 33mm BSR |
| Engine details | Add |
| Displacement | 421 cm³ |
| Power | Add |
| Max RPM | Add |
| Fuel consumption | Add |
| Cooling system | Oil & air |
| Transmission type,final drive | Add |
| Torque | Add |
| Bore | 83 mm |
| Stroke | 71.5 mm |
| Gearbox | 5-speed |
| Greenhouse gases | Add |
| Fuel control | Single Overhead Cams (SOHC) |
| Emission details | Add |
| Driveline | Add |
| Ignition | Add |
| Clutch | Add |
| Lubrication system | Add |
| Compression | 8.6:1 |
| Exhaust system | Add |
| Chassis |
| Front suspension | Independent double wishbone |
| Rear suspension | Independent double wishbone |
| Front brakes | Double disc |
| Rear brakes | Double disc |
| Diameter | Add |
| Frame type | Add |
| Front tyre | 25/8-AT12 |
| Rear tyre | 25/10-AT12 |
| Seat | Add |
| Wheels | Add |
| Front wheel travel | 147 mm |
| Rear wheel travel | 193 mm |
| Trail | Add |
| Rake (fork angle) | Add |
| Other |
| Battery capacity | Add |
| Starter | Electric |
| Color options | - hunter green
- realtree ap camo
- steel blue
|
| Carrying capacity | Add |
| Light | Add |
| Instruments | Add |
| Electrical Voltage | Add |
| Dimensions |
| Wheelbase | 1,229 mm |
| Kerb weight | 284.9 kg |
| Dry weight | Add |
| Power/weight ratio | Add |
| Overall height | 1,186 mm |
| Overall length | 2,017 mm |
| Overall width | 1,115 mm |
| Seat height | 894 mm |
| Alternate seat height | Add |
| Ground clearance | 267 mm |
| Front percentage of weight | Add |
| Rear percentage of weight | Add |
| Performance |
| Top speed | Add |
| Acceleration 0-100 km/h | Add |
| Length | Add |
| Reserve fuel capacity | Add |
| Fuel capacity | 15.14 l |
| Oil capacity | Add |
| Width | Add |
| Height | Add |