Yamaha Big Bear 400 IRS 4x4: history, specs, pictures
| Yamaha Big Bear 400 IRS 4x4 | |
| Manufacturer | |
|---|---|
| Production | 2006 |
| Class | ATV |
| Engine | 4-stroke, Air-/oil-cooled Single, SOHC |
| Compression ratio | 8.6:1 |
| Fuel System | Mikuni 33mm BSR Carburetor |
| Transmission | Gear box: 5 Speed Final Drive: Shaft |
| Suspension | Front: Independent Double Wishbone Rear: Independent Double Wishbone |
| Brakes | Front: Dual Hydraulic Discs Rear: Sealed Wet Brake |
| Front Tire | AT25x8-12 ITP Mud Lite |
| Rear Tire | AT25x10-12 ITP Mud Lite |
| Wheelbase | 48.31 inches (1227 mm) |
| Length | 79.41 inches (2017 mm) |
| Width | 43.9 inches (1115 mm) |
| Seat Height | 35.2 inches (894 mm) |
| Weight | 269.0 kg (wet) |
| Recommended Oil | Yamalube 10w-40 |
| Fuel Capacity | 1.06 Gallon (4.00 Liters) |
| Manuals | Service Manual |
The Yamaha Big Bear 400 IRS 4x4 was a 4-stroke, Air-/oil-cooled Single, SOHC ATV produced by Yamaha in 2006.
Drive[edit | edit source]
The bike has a 5 Speed transmission.
Chassis[edit | edit source]
It came with a AT25x8-12 ITP Mud Lite front tire and a AT25x10-12 ITP Mud Lite rear tire. Stopping was achieved via Dual Hydraulic Discs in the front and a Sealed Wet Brake in the rear. The front suspension was a Independent Double Wishbone while the rear was equipped with a Independent Double Wishbone. The Big Bear 400 IRS 4x4 was fitted with a 1.06 Gallon (4.00 Liters) fuel tank. The wheelbase was 48.31 inches (1227 mm) long.
2006 Yamaha Big Bear 400 IRS 4x4[edit | edit source]
The engine of the Yamaha Big Bear 400 breathes through a 33mm Mikuni Carburetor. The guys at Yamahas engineering facility could have easily been drawn by the temptation to sling one of their famous EFI or Electronic Fuel Injection units on this quad. But to keep with the plan of the simple serviceable unit they opted for the traditional carburetor.