Yamaha YFM400FWS Big Bear 2004 Owner's Manual

Yamaha YFM400FWS Big Bear 2004 manual cover

Pages 176

Year 2004

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Yamaha YFM400FWS Big Bear 2004 Specification

The Yamaha YFM400FWS Big Bear 2004 is a versatile all-terrain vehicle (ATV) designed for both work and recreational purposes. It is powered by a 386cc, air-cooled, single-cylinder, four-stroke engine that delivers reliable performance and strong torque. The vehicle is equipped with a five-speed transmission, including a reverse gear, which enhances maneuverability and control over various terrains. The Big Bear features a sturdy steel frame and independent double wishbone front suspension with 5.8 inches of travel, providing excellent handling and rider comfort. The rear suspension consists of a swingarm with a single shock absorber, offering 5.9 inches of travel for improved stability and ride quality.

The ATV comes with a full-time four-wheel drive system and a limited-slip front differential, ensuring optimal traction and control in challenging conditions. For braking, it utilizes dual hydraulic front disc brakes and a sealed rear drum brake, ensuring reliable stopping power. The Big Bear’s durable construction includes a front cargo rack with a capacity of 88 pounds and a rear cargo rack that can carry up to 176 pounds, making it suitable for hauling gear and supplies.

The ergonomic design features a comfortable seat and user-friendly controls, enhancing the overall riding experience. The fuel tank capacity is 3.8 gallons, providing a decent range for extended trips. With a dry weight of approximately 557 pounds, the Yamaha YFM400FWS Big Bear 2004 strikes a balance between robustness and agility, making it an excellent choice for those seeking a dependable ATV for various outdoor activities and work tasks.

Yamaha YFM400FWS Big Bear 2004 F.A.Q.

How do I perform regular maintenance on my Yamaha YFM400FWS Big Bear 2004?

Regular maintenance includes checking and changing the oil, inspecting the brakes, cleaning the air filter, and ensuring that all bolts and nuts are tightened properly. Refer to the owner's manual for a detailed maintenance schedule.

What type of oil should I use for my Yamaha YFM400FWS Big Bear 2004?

It is recommended to use 10W-40 or 20W-40 four-stroke motor oil that meets JASO MA standards for optimal performance.

How can I troubleshoot starting issues with my Yamaha YFM400FWS Big Bear 2004?

Check the battery for charge, inspect the spark plug for wear or fouling, ensure the fuel supply is sufficient, and examine the starter solenoid and connections for any faults.

What is the correct tire pressure for the Yamaha YFM400FWS Big Bear 2004?

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

How do I adjust the carburetor on my Yamaha YFM400FWS Big Bear 2004?

To adjust the carburetor, locate the air-fuel mixture screw and idle speed screw. Adjust the mixture screw for optimal idle by turning it slowly until the engine runs smoothly. Adjust the idle speed screw to set the correct idle RPM.

What should I do if the brakes on my Yamaha YFM400FWS Big Bear 2004 feel spongy?

Inspect the brake fluid levels and top up if necessary. Check for air in the brake lines and bleed the brakes if required. Examine brake pads for wear and replace them if needed.

How do I replace the spark plug on my Yamaha YFM400FWS Big Bear 2004?

Remove the spark plug cap and use a spark plug wrench to loosen and remove the old spark plug. Install a new spark plug by hand initially to avoid cross-threading, then tighten it with the wrench. Reattach the spark plug cap securely.

What should I check if my Yamaha YFM400FWS Big Bear 2004 is overheating?

Check the coolant level and ensure there are no leaks. Inspect the radiator for clogs and clean it if necessary. Ensure the fan is operational and that the thermostat is functioning correctly.

How do I clean and maintain the air filter on my Yamaha YFM400FWS Big Bear 2004?

Remove the air filter cover and take out the filter. Clean it using compressed air or wash it with a mild detergent if it's a foam filter. Ensure it is dry before reinstalling, and replace it if it shows signs of significant wear or damage.

What are the common causes of poor acceleration in the Yamaha YFM400FWS Big Bear 2004?

Poor acceleration can be caused by a clogged air filter, dirty fuel injectors, worn spark plugs, or incorrect carburetor settings. Ensure these components are clean and properly adjusted.