Yamaha YFM40FBA, YFM40FBHA Big Bear 400 2011 Owner's Manual

Yamaha YFM40FBA, YFM40FBHA Big Bear 400 2011 manual cover
Pages 156
Year 2011
Language(s)
English en

Yamaha YFM40FBA, YFM40FBHA Big Bear 400 2011 Specification

The Yamaha YFM40FBA and YFM40FBHA Big Bear 400 for the year 2011 are robust all-terrain vehicles designed for both recreational and utility purposes. These models are powered by a 386cc, air/oil-cooled, SOHC, four-stroke engine that delivers reliable performance across diverse terrains. The engine features a single-cylinder configuration with a bore and stroke of 84.5mm x 71.5mm, ensuring efficient power delivery and fuel efficiency.

The transmission system includes a five-speed gearbox with a reverse gear, providing versatile control in various conditions. The Big Bear 400 is equipped with a constant-mesh, wet, multiple-disc clutch system that ensures smooth and responsive gear shifts. The drive system incorporates a full-time 4WD with a front differential lock, enhancing traction and stability on challenging surfaces.

The suspension setup comprises an independent double-wishbone front suspension with 5.7 inches of travel and a rear swingarm with 5.7 inches of travel as well, ensuring a comfortable ride over rough terrains. The braking system includes dual hydraulic front disc brakes and a sealed rear drum brake, delivering reliable stopping power.

The dimensions of the Yamaha Big Bear 400 contribute to its stability and maneuverability. It has an overall length of 78.1 inches, a width of 42.7 inches, and a height of 45.3 inches. The wheelbase measures 48.4 inches, providing a balanced ride. The vehicle's ground clearance stands at 9.7 inches, which helps navigate obstacles with ease.

With a fuel capacity of 3.8 gallons, including a 0.7-gallon reserve, the Big Bear 400 ensures extended riding sessions without frequent refueling. The dry weight of the vehicle is 600 pounds, making it manageable yet sturdy enough to handle tough tasks. Overall, the Yamaha YFM40FBA and YFM40FBHA Big Bear 400 are dependable ATVs built to deliver performance, durability, and versatility.

Yamaha YFM40FBA, YFM40FBHA Big Bear 400 2011 F.A.Q.

What type of oil should be used for the Yamaha Big Bear 400 2011?

For optimal performance, use 10W-40 or 20W-50 four-stroke motorcycle oil. Ensure the oil meets JASO MA standards for wet clutch compatibility.

How often should the air filter be cleaned or replaced on the Big Bear 400?

Clean the air filter every 20 hours of operation or more frequently if riding in dusty conditions. Replace the air filter if it shows signs of wear or damage.

What is the correct tire pressure for the Yamaha YFM40FBA Big Bear 400 2011?

The recommended tire pressure is 4.4 psi (30 kPa) for the front tires and 3.6 psi (25 kPa) for the rear tires. Always check tire pressure when the tires are cold.

How can I troubleshoot a starting issue with my Big Bear 400?

First, check the battery charge and connections. Ensure the fuel is fresh and the fuel valve is open. Inspect the spark plug for wear or fouling and replace if necessary.

What maintenance should be performed after 100 hours of use?

After 100 hours, change the engine oil, check and adjust the valve clearance, inspect the drive belt, and lubricate all grease points.

How do I adjust the idle speed on the Yamaha Big Bear 400?

Locate the idle speed adjustment screw on the carburetor. Turn the screw clockwise to increase idle speed or counterclockwise to decrease it. The idle speed should be set to 1,450-1,550 RPM.

What is the proper way to store the Big Bear 400 for an extended period?

Clean the ATV thoroughly, change the oil, stabilize the fuel, disconnect the battery, and store it in a dry, covered area. Inflate the tires to the recommended pressure and cover the ATV to protect it from dust and moisture.

How do I check the coolant level on my Big Bear 400?

Ensure the ATV is on a level surface and the engine is cool. Remove the radiator cap and check if the coolant is at the top of the filler neck. Add coolant if necessary, and make sure the coolant reservoir is between the "Full" and "Low" marks.

What should I do if the engine overheats?

Stop the ATV immediately and turn off the engine. Allow it to cool down before checking the coolant level. Inspect the radiator and cooling fan for obstructions and ensure the coolant is at the correct level.

How can I improve the fuel efficiency of my Big Bear 400?

Regular maintenance such as keeping the air filter clean, maintaining proper tire pressure, and ensuring the carburetor is tuned can help improve fuel efficiency. Avoid aggressive acceleration and maintain a steady speed when riding.