Yamaha YFM40FBW Big Bear 400 2007 Owner's Manual

Yamaha YFM40FBW Big Bear 400 2007 manual cover

Pages 168

Year 2007

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Yamaha YFM40FBW Big Bear 400 2007 Specification

The Yamaha YFM40FBW Big Bear 400, released in 2007, is a robust utility ATV designed to handle a variety of terrains with ease. Powered by a reliable 386cc, air/oil-cooled, SOHC four-stroke engine, the Big Bear 400 delivers a balance of power and efficiency. The engine is mated to a five-speed transmission featuring an automatic clutch, providing smooth gear transitions and making it user-friendly for a broad range of riders. The ATV's Ultramatic® V-belt system offers superior durability and reduced belt wear, ensuring longevity and reliable performance under heavy loads.

The Big Bear 400 is equipped with a capable suspension system, including an independent double-wishbone front suspension with 5.7 inches of travel and a swingarm rear suspension offering 6.3 inches of travel. This setup ensures a comfortable ride over rough terrain. The braking system features dual hydraulic front disc brakes and a sealed rear drum brake, providing strong and consistent stopping power even in wet and muddy conditions.

Designed for utility, the Big Bear 400 includes a sturdy steel cargo rack with a load capacity of 88 pounds at the front and 176 pounds at the rear, making it suitable for transporting equipment and supplies. The ATV also features a 4.0-gallon fuel tank, offering extended range for long rides or workdays.

The ergonomics of the Yamaha Big Bear 400 cater to rider comfort, with a well-padded seat and easy-to-reach controls. Its overall dimensions, including a length of 78.1 inches, width of 44.1 inches, and height of 45.3 inches, provide a compact yet spacious ride. The 2007 Yamaha YFM40FBW Big Bear 400 is a versatile and durable ATV, ideal for both recreational and work-related activities.

Yamaha YFM40FBW Big Bear 400 2007 F.A.Q.

How do I perform a basic oil change on the Yamaha YFM40FBW Big Bear 400 2007?

To perform an oil change, first warm up the engine to allow the oil to flow easily. Turn off the engine and place an oil pan under the drain plug. Remove the drain plug and allow the old oil to drain completely. Replace the drain plug and remove the oil filter. Install a new oil filter and fill the engine with the recommended oil type and quantity as per the manual. Check for any leaks before riding.

What should I do if my Yamaha Big Bear 400 won't start?

If your Big Bear 400 won't start, check the following: Ensure the fuel valve is on and there's fuel in the tank. Verify that the battery is charged and connections are clean. Check the spark plug for wear or damage and replace if necessary. Ensure the kill switch is in the run position. If these steps do not resolve the issue, further diagnostics may be required.

How often should I change the air filter on my Yamaha YFM40FBW Big Bear 400?

The air filter should be inspected and cleaned every 20 hours of operation or more frequently in dusty conditions. Replace the air filter if it's damaged or excessively dirty. Regular maintenance ensures optimal engine performance and longevity.

What type of coolant is recommended for the Yamaha Big Bear 400?

Use a high-quality ethylene glycol antifreeze containing corrosion inhibitors for aluminum engines. Ensure the coolant is mixed with distilled water in a 1:1 ratio unless the coolant is pre-mixed. Avoid using automotive coolant with silicates.

How can I troubleshoot overheating issues on my Yamaha Big Bear 400?

If your Big Bear 400 is overheating, check for proper coolant levels and refill if necessary. Inspect the radiator for obstructions or damage. Ensure the cooling fan operates correctly. Verify the thermostat is functioning, and replace it if stuck. Consider the ambient temperature and riding conditions, as they can also affect engine temperature.

What is the correct tire pressure for the Yamaha YFM40FBW Big Bear 400?

The recommended tire pressure for the Yamaha Big Bear 400 is typically 4 psi for the front tires and 4 psi for the rear tires. Always refer to the owner's manual for specific recommendations and adjust according to load and riding conditions.

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

To adjust the brakes, locate the brake adjuster on the rear brake lever or the brake drum. Tighten the adjuster until the brake begins to drag, then back off slightly for proper clearance. Test the brakes for effectiveness and adjust further if necessary. Ensure that front and rear brakes are balanced for safe operation.

What should be included in regular maintenance for the Yamaha YFM40FBW Big Bear 400?

Regular maintenance should include oil and filter changes, air filter inspection, brake inspection and adjustment, tire pressure checks, coolant level inspection, and battery maintenance. Also, periodically inspect the drive chain, throttle, and other controls for proper function.

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

To improve fuel efficiency, ensure the engine is well-maintained with regular oil changes and clean filters. Keep the tires inflated to the correct pressure. Avoid aggressive acceleration and maintain a steady speed when possible. Reducing excess weight and unnecessary cargo can also help improve efficiency.

What are common signs of a worn-out clutch on the Yamaha YFM40FBW Big Bear 400?

Common signs of a worn-out clutch include difficulty shifting gears, a slipping clutch during acceleration, unusual noises when engaging the clutch, and a spongy clutch lever feel. If you experience these symptoms, it may be time to inspect and replace the clutch components.