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Service/Repair your 4x4 ATV: Buy and download this Yamaha Motor Company Big Bear 400 OEM service manual (FSM)/PDF.
Specs and manual details:
Pages: 388
Production/model years: 2007, 2008, 2009, 2010
This manual applies to the following models: Big Bear 400 YFM40FB / Yamaha Motor Corp., Ltd
2007 Yamaha Big Bear 400 YFM40FBW 4x4
2008 Yamaha Big Bear 400 YFM40FBX 4x4
2009 Yamaha Big Bear 400 YFM40FBY 4x4
2010 Yamaha Big Bear 400 YFM40FBZ 4x4
Engine: 386cc SOHC four-stroke single; air-/oil-cooled w/fan, 83.0 x 71.5, 8.6:1, Mikuni BSR-33, DC-CDI
Manual Language: English
Printable: Yes
Delivery: Download link will appear on the checkout page after your payment is complete.
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"Instantly Download Your Comprehensive Repair Manual for the 2007-2010 Yamaha Big Bear 400, YFM40FB 4x4"
Get the knowledge you need to maintain and repair your 2007-2010 Yamaha Big Bear 400, YFM40FB 4x4 ATV with this detailed, easy-to-follow repair manual. Gain insights on technical specifications, maintenance tips, and solutions to common issues, and keep your ATV running at peak performance.
Engine Specs/Technical Specifications:
• The Big Bear 400 is powered by a 386cc, air-cooled, SOHC, four-stroke engine.
• It features a single overhead camshaft (SOHC) design for improved performance.
• The engine uses a wet sump lubrication system for enhanced reliability.
• Yamaha incorporated a Mikuni 33mm BSR carburetor for precise fuel delivery.
• The ATV has a CDI ignition system for consistent and reliable starting.
• Its engine is mated to a five-speed transmission with reverse.
• The Big Bear 400 features a shaft drive system for low maintenance and durability.
• It has a front and rear independent suspension for a smooth and comfortable ride.
• The ATV is equipped with hydraulic disc brakes on both front and rear wheels for reliable stopping power.
• It has a towing capacity of 1,102 lbs (500 kg), making it a versatile workhorse.
• The ATV features a 4.0-gallon (15 L) fuel tank for extended rides.
• Its ground clearance is 9.7 inches (246 mm) for better off-road capabilities.
• The Big Bear 400 boasts a sturdy steel frame for enhanced durability.
• The ATV has a dry weight of 595 lbs (270 kg).
• It features a sturdy front rack with a carrying capacity of 88 lbs (40 kg) and a rear rack with a 176 lbs (80 kg) capacity.
• The Big Bear 400 comes with a 12V DC outlet for powering accessories.
• Its seat height is 33.1 inches (840 mm), providing a comfortable riding position.
• The ATV has a wheelbase of 49.2 inches (1,250 mm) for increased stability.
• It is equipped with a standard 2-inch hitch receiver for towing.
• The front tires are AT25 x 8-12 and the rear tires are AT25 x 10-12 for improved traction and stability.
• The Big Bear 400 features a push-button 2WD/4WD system for easy switching between modes.
• It is equipped with Yamaha's On-Command system, providing a fully locked front differential.
• The ATV has a speedometer, odometer, and dual trip meters for added convenience.
• Its turning radius is 122 inches (3,100 mm) for improved maneuverability.
• The Yamaha Big Bear 400, YFM40FB 4x4, has an electric start with auxiliary pull-start backup.
Interesting Facts and Details:
- The Big Bear 400 was designed for both work and play, making it a versatile ATV.
- It is well-known for its reliability and durability, even in harsh conditions.
- The ATV's compact size makes it easy to maneuver in tight spaces.
- The Big Bear 400 was one of the first ATVs to incorporate Yamaha's On-Command system.
- It has a reputation for being easy to maintain, even for DIY enthusiasts.
- The Big Bear 400 is appreciated for its comfortable ride and handling.
Maintenance Intervals and Tips:
- Change the engine oil and clean the oil filter every
- Inspect and clean the air filter every 50 hours of operation or more frequently in dusty conditions.
- Check and adjust valve clearance every 600 miles (1,000 km) or every six months.
- Inspect and lubricate the drive shaft boots and joints every 200 miles (320 km) or three months.
- Replace the spark plug every 6,000 miles (10,000 km) or 12 months.
- Check and adjust the brake fluid level every 200 miles (320 km) or three months.
- Inspect and clean the fuel system, including the carburetor, every 1,500 miles (2,400 km) or 12 months.
Common Issues and Solutions:
Issue: Carburetor problems causing poor performance or starting issues.
Solution: Regularly clean and inspect the carburetor and ensure the jets are free from debris.
Issue: Worn or damaged CV joints and boots.
Solution: Regularly inspect and lubricate CV joints and replace the boots if necessary.
Issue: Weak or dead battery.
Solution: Keep the battery charged and replace it if it no longer holds a charge.
Issue: Worn or damaged brake pads and rotors.
Solution: Regularly inspect the brake system and replace any worn or damaged components.
Popular Tuning Tips and Modifications:
- Upgrade the exhaust system for improved performance and sound.
- Install a performance air filter for better airflow and engine response.
- Rejet the carburetor for optimal fuel delivery and performance.
- Install heavy-duty suspension components for better off-road capabilities.
- Add a winch for increased utility and recovery options.
Available Accessories and Aftermarket Options:
- Skid plates and A-arm guards for increased underbody protection.
- Front and rear brush guards for added protection and style.
- Storage boxes and cargo bags for increased carrying capacity.
- Heated grips and thumb warmers for cold weather riding.
- Windshields and fairings for improved rider comfort and protection.
Strengths:
- Reliable and durable, even in harsh conditions.
- Versatile, suitable for both work and play.
- Easy to maintain and work on, making it ideal for DIY enthusiasts.
- Comfortable ride and handling.
Weaknesses:
- Some owners report carburetor issues, especially in colder climates.
- Some owners find the stock suspension too soft for aggressive off-road riding.
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