Yamaha Big Bear 400 IRS
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| Yamaha Big Bear 400 IRS | |
| Manufacturer | |
|---|---|
| Production | 2009 |
| Class | ATV |
| Engine | 4-stroke, Air-/oil-cooled Single, SOHC |
| Bore / Stroke | 83.8mm x 83.8mm |
| Compression ratio | 8.6:1 |
| Transmission | Gear box: 5-speed, reverse Final Drive: On-Command pushbutton; 3-way locking differential; 2WD, 4WD, locked 4WD; shaft drive |
| Suspension | Front: Independent double wishbone; 5.8-in travel Rear: Independent double wishbone; 7.6-in travel |
| Brakes | Front: Dual Hydraulic Discs Rear: Sealed wet brake |
| Front Tire | AT25 x 8-12 ITP Mud Lite |
| Rear Tire | AT25 x 10-12 ITP Mud Lite |
| Wheelbase | 48.39 inches (1229 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 was a 4-stroke, Air-/oil-cooled Single, SOHC ATV produced by Yamaha in 2009.
Engine[edit | edit source]
A 83.8mm bore x 83.8mm stroke result in a displacement of just 386.0 cubic centimeters.
Drive[edit | edit source]
The bike has a 5-speed, reverse transmission. Power was moderated via the Automatic clutch.
Chassis[edit | edit source]
It came with a AT25 x 8-12 ITP Mud Lite front tire and a AT25 x 10-12 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; 5.8-in travel while the rear was equipped with a Independent double wishbone; 7.6-in travel. The Big Bear 400 IRS was fitted with a 1.06 Gallon (4.00 Liters) fuel tank. The wheelbase was 48.39 inches (1229 mm) long.
2009 Yamaha Big Bear 400 IRS[edit | edit source]
The 2008 Yamaha Big Bear 400 just gets better and better with the addition of the IRS package: with independent rear suspension, this ATV is now able to copy the terrain roughness even better than before, maximizing traction and carry rider and gear further into the wilderness. A semi-automatic transmission with a 5-speed gearbox and automatic clutch, makes things easy and fun, even for the less experienced rider.
With a differential with 3 on-command locking positions, the 2008 Yamaha Big Bear 400 IRS has better grip on slippery terrain and steep slopes, alike. This ATV retains the serious racking capacity of the bigger beasts and can tow heavy loads, thus being a dependable partner in completing the toughest tasks and being a fun machine for weekend trail fun, camping or even longer off-road explorations.