Yamaha YFM400P Big Bear 2002 Owner's Manual

Yamaha YFM400P Big Bear 2002 manual cover

Pages 168

Year 2002

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Yamaha YFM400P Big Bear 2002 Specification

The Yamaha YFM400P Big Bear 2002 is an all-terrain vehicle (ATV) designed for both recreational and utility purposes. It features a robust 386cc air-cooled, four-stroke, single-cylinder engine that delivers reliable power and performance. The engine is coupled with a five-speed manual transmission, which includes a reverse gear, providing versatility for various riding conditions. The vehicle's suspension system comprises an independent double-wishbone front suspension with 5.9 inches of travel and a swingarm rear suspension with 7.1 inches of travel, ensuring a smooth ride over rough terrain.

The ATV is equipped with hydraulic disc brakes on the front and sealed drum brakes on the rear, offering dependable stopping power. The 2002 Big Bear comes with a durable steel frame designed to withstand rugged use, and its overall dimensions are 78.1 inches in length, 42.5 inches in width, and 45.3 inches in height, with a wheelbase of 48.8 inches. The vehicle's ground clearance stands at 9.7 inches, allowing it to navigate challenging off-road environments.

Tire specifications include 25x8-12 front tires and 25x10-12 rear tires, providing excellent traction and stability. The YFM400P Big Bear also features a 4.0-gallon fuel tank, which supports extended riding sessions without frequent refueling. Additional utility features include a front cargo rack with a capacity of 88 pounds and a rear cargo rack that can hold up to 176 pounds, making it suitable for carrying equipment or supplies.

With a dry weight of approximately 557 pounds, the Yamaha YFM400P Big Bear 2002 strikes a balance between power, durability, and functionality, catering to both adventure enthusiasts and those needing a reliable workhorse for various tasks.

Yamaha YFM400P Big Bear 2002 F.A.Q.

How do I perform a basic oil change on my Yamaha YFM400P Big Bear 2002?

To perform a basic oil change, first warm up the engine to allow the oil to drain smoothly. Turn off the engine and place an oil pan under the drain plug. Remove the drain plug and let the oil drain completely. Replace the drain plug and remove the oil filter. Install a new oil filter and fill the engine with the recommended type and amount of oil. Finally, check the oil level with the dipstick and ensure there are no leaks.

What should I do if my Yamaha YFM400P Big Bear 2002 won't start?

First, check the battery to ensure it is charged and the connections are clean and tight. Examine the fuel system to ensure there is enough fuel and the fuel valve is open. Check the spark plug for wear or damage and replace if necessary. If the ATV still won't start, it may be helpful to check the starter relay and ignition switch for faults.

How do I adjust the idle speed on my Yamaha YFM400P Big Bear 2002?

Locate the idle adjustment screw on the carburetor. Start the engine and allow it to warm up to normal operating temperature. Turn the idle adjustment screw clockwise to increase the idle speed or counterclockwise to decrease it. Adjust until the engine idles smoothly at the recommended RPM.

What type of spark plug should I use for my Yamaha YFM400P Big Bear 2002?

The recommended spark plug for the Yamaha YFM400P Big Bear 2002 is the NGK DPR8EA-9. Make sure to check the gap and adjust it to 0.8-0.9 mm if necessary before installation.

How often should I replace the air filter on my Yamaha YFM400P Big Bear 2002?

It is recommended to check the air filter every 20 hours of use and replace it if it appears dirty or damaged. Under dusty or harsh conditions, more frequent checks and replacements may be necessary.

What is the proper tire pressure for my Yamaha YFM400P Big Bear 2002?

The recommended tire pressure for the Yamaha YFM400P Big Bear 2002 is 4 psi for the front tires and 3 psi for the rear tires. Always check the tire pressure with an accurate gauge before riding.

How can I improve the fuel efficiency of my Yamaha YFM400P Big Bear 2002?

To improve fuel efficiency, ensure regular maintenance such as changing the oil, replacing the air filter, and checking tire pressure. Avoid aggressive throttle use and maintain a consistent speed. Consider reducing the load on the ATV to minimize fuel consumption.

What should I do if the brakes on my Yamaha YFM400P Big Bear 2002 feel spongy?

If the brakes feel spongy, first check the brake fluid level and add fluid if necessary. Inspect the brake lines for leaks or damage. Bleed the brake system to remove any trapped air. If the problem persists, it may be necessary to replace the brake pads or service the brake system.

How do I troubleshoot electrical issues on my Yamaha YFM400P Big Bear 2002?

Begin by checking the battery voltage and connections. Inspect the fuses and replace any that are blown. Check wiring for signs of wear or damage. Use a multimeter to test the continuity of switches and relays. If the electrical issue remains unresolved, consult the service manual or a professional technician.

How can I prevent rust on my Yamaha YFM400P Big Bear 2002?

To prevent rust, regularly wash and dry your ATV, especially after exposure to mud or saltwater. Apply a protective wax or spray to metal surfaces. Store the ATV in a dry, covered area and consider using a cover for added protection. Regular maintenance and inspections will help identify and address rust early.