Yamaha YFM40FBY Big Bear 400 2009 Owner's Manual

Yamaha YFM40FBY Big Bear 400 2009 manual cover

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Year 2009

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Yamaha YFM40FBY Big Bear 400 2009 Specification

The 2009 Yamaha YFM40FBY Big Bear 400 is an all-terrain vehicle designed to deliver robust performance and reliability. It is powered by a 386cc, air-cooled, SOHC, 4-stroke engine, offering a blend of power and efficiency suitable for various off-road conditions. The engine is paired with a five-speed manual transmission, including a reverse gear, providing versatile control and ease of navigation through tough terrains.

The Big Bear 400 features a rugged chassis that ensures durability and stability. Its double-wishbone front suspension and swingarm rear suspension system offer a smooth ride by effectively absorbing shocks and bumps. The front suspension has 5.7 inches of travel, while the rear provides 6.3 inches, enhancing the vehicle's ability to tackle uneven surfaces.

A key feature of this model is its Ultramatic V-belt transmission with an automatic centrifugal clutch, which ensures seamless power delivery and reduces wear on the engine. The ATV is equipped with hydraulic disc brakes at the front and sealed drum brakes at the rear, ensuring reliable stopping power under various conditions.

The Yamaha Big Bear 400 has a fuel capacity of 3.8 gallons, including a 0.7-gallon reserve, allowing for extended riding sessions without frequent refueling. Its ground clearance stands at 9.7 inches, and the wheelbase measures 48.8 inches, providing stability and maneuverability. The vehicle's overall dimensions are 81.1 inches in length, 43.7 inches in width, and 45.3 inches in height, with a dry weight of approximately 600 pounds.

Additional features include a digital LCD meter for monitoring speed, fuel, and other essential parameters, along with front and rear cargo racks, providing practical utility for carrying gear. The 2009 Yamaha YFM40FBY Big Bear 400 is designed to meet the demands of both recreational riders and those requiring a reliable workhorse for rugged outdoor tasks.

Yamaha YFM40FBY Big Bear 400 2009 F.A.Q.

What is the recommended oil type and capacity for the Yamaha YFM40FBY Big Bear 400 2009?

The recommended oil type for the Yamaha YFM40FBY Big Bear 400 2009 is SAE 10W-40, and the oil capacity is approximately 2.64 quarts (2.5 liters) when changing the oil and filter.

How often should I change the oil in my Yamaha Big Bear 400?

It is advised to change the oil every 6 months or every 600 miles (about 965 kilometers), whichever comes first, to ensure optimal performance and longevity.

What type of spark plug should I use for the Yamaha Big Bear 400, and what is the gap setting?

The recommended spark plug for the Yamaha Big Bear 400 is NGK DPR8EA-9. The spark plug gap should be set to 0.8-0.9 mm (0.031-0.035 inches).

How can I troubleshoot if my Yamaha Big Bear 400 won't start?

If your Yamaha Big Bear 400 won't start, check the battery connections, ensure the fuel valve is open, inspect the spark plug for wear or damage, and verify that the kill switch is in the 'Run' position.

What is the proper tire pressure for the Yamaha Big Bear 400?

The recommended tire pressure for the Yamaha Big Bear 400 is 4.4 psi for the front tires and 3.6 psi for the rear tires. Always check the pressure when the tires are cold.

How can I maintain the brakes on my Yamaha Big Bear 400?

Regularly inspect the brake pads for wear and replace them if necessary. Check the brake fluid level and top up with DOT 4 brake fluid if needed. Ensure the brake lines are free of leaks.

What should I do if my Yamaha Big Bear 400 overheats?

If the engine overheats, stop the vehicle and allow it to cool down. Check the coolant level and refill if necessary. Inspect the radiator for obstructions and clean the cooling fins.

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

To adjust the idle speed, locate the idle adjustment screw on the carburetor. Turn the screw clockwise to increase the idle speed and counterclockwise to decrease it, aiming for an idle speed of 1,450-1,550 rpm.

What regular maintenance should be performed on the Yamaha Big Bear 400's transmission?

Regular maintenance for the transmission includes checking the fluid level and condition, ensuring there are no leaks, and replacing the transmission oil every 12 months or 1,200 miles (about 1,930 kilometers).

How do I store my Yamaha Big Bear 400 for the winter?

For winter storage, clean the ATV thoroughly, change the oil, fill the fuel tank and add a fuel stabilizer, disconnect the battery, and store it in a dry, cool place. Also, cover the ATV to protect it from dust and moisture.