2006-2012 Yamaha YFM40FBW (Big Bear 400 4WD IRS) ATV Service Manual

Addresses Big Bear 400 4WD IRS systems including engine, carburetor, drive train, chassis, electrical, and troubleshooting. PN LIT-11616-20-45

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Document Details

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Document Number / Seller:
26628 / Donald Peterson
File Size:
7.08 MB
File Type:
PDF
Language:
English
Pages:
391
Printable:
Yes
Estimated Download Time:
0.15 Minutes
Delivery Format:
Digital (PDF) - Instant Access
Category:
ATV
Brand:
Yamaha
Reviewed and Approved:
Dec 25, 2025
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Models Covered & Key Technical Specifications

Yamaha Big Bear 400 4WD IRS (LIT-11616-20-45) 2006-2012

This manual provides comprehensive coverage for your Yamaha Big Bear 400 4WD IRS.

  • System Diagnostic Data: 387.0 cm3 displacement outlines the engine's core capacity Architecture.
  • Specific Component Specifications: For engine rebuilding, 8.60:1 compression ratio defines the standard limit Framework.
  • Essential Lubrication Data: 2.90 L specifies the periodic oil change quantity Threshold.
  • Advanced Electrical Parameters: The ignition system utilizes DC CDI for standard operation Logic.
  • Core Chassis Measurements: 22-28 kPa tire pressure determines the environmental limit Parameters.
  • Published Assembly Information: The rear brake uses a wet, multiple-disc brake system Configuration.

Professional Workshop Service Manual & Technical Specifications

Yamaha Big Bear 400 4WD IRS (LIT-11616-20-45) 2006-2012 Comprehensive Service, Repair, and Maintenance Manual Parts-Reference

Component-Focus: Big Bear 400 4WD IRS • Model-Portfolio: YFM40FBW (2007), Yamaha Big Bear 400 4WD IRS (2007), 4S11 (2007), 4S14 (2007) • Operational-Framework: ATV

TABLE OF CONTENTS

Identifier System-Path Context
GENERAL INFORMATION 1-1 General vehicle information, VIN, model labels, and features.
SPECIFICATIONS 2-1 Detailed general, engine, chassis, and electrical specifications.
PERIODIC CHECKS AND ADJUSTMENTS 3-1 Maintenance schedules, engine and chassis checks, and adjustments.
ENGINE 4-1 Engine removal, cylinder head, camshaft, and piston procedures.
CARBURETOR 5-1 Carburetor inspection, assembly, and fuel level adjustment.
DRIVE TRAIN 6-1 Front and rear constant velocity joints, differential gears, and final drive gears.
CHASSIS 7-1 Front/rear wheels, brakes, steering system, and shock absorber details.
ELECTRICAL 8-1 Ignition, starting, charging, lighting, and signaling systems.
TROUBLESHOOTING 9-1 Common issues and diagnostic procedures for starting, performance, brakes, and lighting.

Precisely mandating comprehensive coverage, this manual delves into the intricate systems of your ATV. From engine overhauls to electrical diagnostics, it outlines all procedures. Careful attention is paid to detailing technical specifications and maintenance intervals. Removal procedures are documented for all major components, including the engine, carburetor, and drive train. Technical specifications are provided for critical areas like brake pad wear limits and tire pressure. Factory specifications are documented for suspension adjustments and steering system checks. Engine rebuild procedures are documented for valve clearance and piston ring measurements. Drivetrain specifications are addressed in procedures for differential and final gear backlash. This manual is an indispensable resource for maintaining your Yamaha Big Bear 400 4WD IRS.

FAQ

Determine the **specific** torque specifications for critical engine components. keyboard_arrow_down

20 Nm is specified for the camshaft sprocket bolt to ensure proper engine assembly.

What specifications **designated** safety precautions are included for battery handling? keyboard_arrow_down

30 minutes is the recommended wait time after charging for an MF battery before measuring open-circuit voltage.

Check the **critical** lubrication requirements for the balancer drive gear. keyboard_arrow_down

60 Nm is the specified torque for the balancer driven gear nut to ensure correct assembly.

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Reviews (4)

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Rated 4 out of 5 stars
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The manual is incredibly detailed and easy to follow. Perfect for DIY repairs!
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The download process was smooth, and customer support was super helpful when I had questions!
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I appreciate the clear diagrams and step-by-step instructions. Made servicing my ATV a breeze.