Yamaha YFM40FBX Big Bear 400 2008 Owner's Manual

Yamaha YFM40FBX Big Bear 400 2008 manual cover

Pages 168

Year 2008

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Yamaha YFM40FBX Big Bear 400 2008 Specification

The Yamaha YFM40FBX Big Bear 400 2008 is a robust and versatile all-terrain vehicle designed for both recreational and utility purposes. It features a 386cc, air-cooled, SOHC, 4-stroke engine that delivers reliable power and efficient performance. The electronic fuel injection system ensures optimal fuel delivery, enhancing throttle response and fuel efficiency. The transmission is a five-speed manual with an automatic clutch, providing smooth and responsive shifting. The inclusion of a reverse gear adds convenience for maneuvering in tight spaces.

The Big Bear 400 is equipped with an Ultramatic V-belt transmission, which includes high, low, neutral, reverse, and park modes, making it adaptable to various terrains and tasks. The suspension system comprises independent double wishbones at the front and a swingarm at the rear, both offering substantial travel to absorb rough terrain. The vehicle rides on durable steel wheels, fitted with aggressive all-terrain tires that ensure superior traction and stability.

Braking is managed by dual hydraulic discs at the front and a sealed drum at the rear, providing reliable stopping power in diverse conditions. The Big Bear 400 also features a sturdy frame, designed to withstand the rigors of off-road use, and comes with front and rear cargo racks capable of carrying substantial loads. The ATV includes a digital instrument panel displaying essential information such as speed, fuel level, and engine diagnostics, aiding the rider in maintaining optimal performance.

With its combination of power, durability, and versatility, the Yamaha YFM40FBX Big Bear 400 2008 stands out as a dependable choice for both enthusiasts and those needing a reliable workhorse in challenging environments.

Yamaha YFM40FBX Big Bear 400 2008 F.A.Q.

What type of oil should I use for the Yamaha YFM40FBX Big Bear 400 2008?

It is recommended to use SAE 10W-40, API service SE, SF, SG type oil for the Yamaha YFM40FBX Big Bear 400 2008. Ensure the oil is suitable for wet clutches.

How do I troubleshoot if the engine won't start on my Yamaha Big Bear 400?

First, check the battery condition and ensure it is fully charged. Examine the fuel system for blockages, and inspect the spark plug for fouling or damage. Verify that the kill switch is in the correct position and that fuel is reaching the engine.

What is the recommended maintenance schedule for the Big Bear 400?

Perform oil changes every 6 months or 1,000 miles, whichever comes first. Clean the air filter every 3 months or 500 miles. Check and adjust the brakes and inspect the tires for wear regularly. Replace the spark plug annually.

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

To adjust the idle speed, locate the idle adjustment screw on the carburetor. Turn the screw clockwise to increase idle speed or counterclockwise to decrease it. Aim for an idle speed of approximately 1,450 to 1,550 RPM.

What should I do if the ATV is overheating?

Check the coolant level and ensure there are no leaks in the cooling system. Clean the radiator fins and ensure there is no obstruction. Verify that the cooling fan is operational. Avoid riding in excessively hot conditions or overloading the ATV.

How do I replace the spark plug on the Yamaha Big Bear 400?

First, remove the spark plug cap, then use a spark plug wrench to unscrew the old spark plug. Check and set the gap on the new spark plug to the manufacturer’s specifications, then install it by hand before tightening with the wrench. Reattach the spark plug cap.

What type of coolant is recommended for the Yamaha YFM40FBX Big Bear 400?

Use a high-quality ethylene glycol antifreeze containing corrosion inhibitors for aluminum engines. Mix with distilled water in a 1:1 ratio for optimal performance.

How can I fix a slipping clutch on my Big Bear 400?

Inspect the clutch plates for wear or damage and replace them if needed. Ensure the clutch cable is properly adjusted and not too tight. Use only recommended oil to avoid issues with the wet clutch system.

What are the tire pressure specifications for the Yamaha Big Bear 400?

The recommended tire pressure for the Big Bear 400 is 4 psi (0.28 bar) for the front tires and 3 psi (0.21 bar) for the rear tires. Always check tire pressure when the tires are cold.

How do I store my Big Bear 400 for an extended period?

Clean the ATV thoroughly and apply a protective wax. Change the oil and filter, and add fuel stabilizer to the tank. Disconnect the battery and store it in a cool, dry place. Cover the ATV to protect it from dust and moisture.