Yamaha YFM400S Big Bear 2004 Owner's Manual

Yamaha YFM400S Big Bear 2004 manual cover

Pages 174

Year 2004

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Yamaha YFM400S Big Bear 2004 Specification

The Yamaha YFM400S Big Bear 2004 is a robust all-terrain vehicle designed for both utility and recreational purposes. Powered by a 386cc air-cooled, SOHC, four-stroke engine, it delivers reliable performance and efficient power output. The engine is paired with a five-speed transmission system, including a reverse gear, which ensures versatile handling and control across various terrains.

The Big Bear features a durable steel frame with a double wishbone front suspension and a swingarm rear suspension, both equipped with preload-adjustable shocks, providing a smooth ride and excellent stability. The front brakes consist of dual hydraulic discs, while the rear utilizes a sealed drum brake, offering dependable stopping power.

This ATV is equipped with a 4.0-gallon fuel tank, ensuring extended operation without frequent refueling. It also includes a convenient electric start system with a backup recoil starter for reliability in diverse conditions. The Big Bear's design incorporates a full-length skid plate for added protection and durability during off-road adventures.

Measuring 78.1 inches in length, 42.7 inches in width, and 45.3 inches in height, with a wheelbase of 48.8 inches, the vehicle maintains a balanced and maneuverable profile. The ground clearance stands at 9.7 inches, allowing it to navigate rough and uneven terrain effectively. The ATV has a dry weight of approximately 557 pounds, providing a solid yet manageable build.

Additional features include a multifunctional digital display, front and rear cargo racks with a combined capacity of up to 264 pounds, and a towing capacity of 728 pounds, making it suitable for various hauling tasks. The Yamaha YFM400S Big Bear 2004 combines rugged construction with practical features, making it a reliable choice for both work and play.

Yamaha YFM400S Big Bear 2004 F.A.Q.

How do I perform basic maintenance on the Yamaha YFM400S Big Bear 2004?

To perform basic maintenance, regularly check and change the oil, inspect the air filter, tighten any loose nuts and bolts, and lubricate the chain. Also, ensure that the brakes and tires are in good condition.

What type of oil should I use for the Yamaha YFM400S Big Bear 2004?

Use a high-quality 4-stroke motorcycle oil with a viscosity rating of 10W-40 or 20W-50, depending on the ambient temperature where you are operating the ATV.

How do I troubleshoot starting issues with the Yamaha YFM400S Big Bear 2004?

If the ATV won’t start, check the battery for charge, inspect the spark plug for wear or fouling, ensure the fuel system is delivering fuel, and verify that the ignition system is functioning.

What is the proper way to clean the air filter on my Yamaha YFM400S Big Bear 2004?

Remove the air filter, wash it gently with a mild detergent and water, let it dry completely, and apply a light coat of air filter oil before reinstalling it.

Why is my Yamaha YFM400S Big Bear 2004 overheating?

Overheating can be caused by low coolant levels, a dirty radiator, a malfunctioning thermostat, or a clogged exhaust system. Check and address these areas as needed.

How do I adjust the valve clearance on my Yamaha YFM400S Big Bear 2004?

To adjust the valve clearance, remove the valve cover, rotate the engine to TDC on the compression stroke, and use a feeler gauge to measure and adjust the clearance to the factory specifications.

What should I do if my Yamaha YFM400S Big Bear 2004's transmission is slipping?

Check the transmission oil level and condition, inspect the clutch for wear, and ensure the clutch cable is correctly adjusted. If problems persist, further mechanical inspection may be necessary.

How can I improve the fuel efficiency of my Yamaha YFM400S Big Bear 2004?

Maintain proper tire pressure, regularly service the engine, use high-quality fuel, and avoid excessive idling to improve fuel efficiency.

What are the recommended tire pressures for the Yamaha YFM400S Big Bear 2004?

The recommended tire pressure is typically around 4 psi for the front tires and 4 psi for the rear tires, but refer to the owner’s manual for specifics.

How do I replace the brake pads on my Yamaha YFM400S Big Bear 2004?

To replace the brake pads, remove the wheel, detach the caliper, remove the old pads, compress the caliper piston, and install the new pads before reassembling.