2000-2001 Yamaha Big Bear 400 ATV Service Manual

Covers YFM400FWNM and YFM400FNMC Big Bear 400 models, with sections on engine overhaul, carburetor, and electrical systems. Includes diagrams and specifications. Ref: LIT-11616-13-22

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Document Details

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Document Number / Seller:
31431 / Amy Ramirez
File Size:
41.05 MB
File Type:
ZIP
Language:
English
Printable:
Yes
Category:
ATV
Last updated / verified
May 16, 2025

Models Covered & Key Technical Specifications

Yamaha Big Bear 400, YFM400FWNM, YFM400FNMC ATV Service Manual: 2000-2001 Big Bear 400 / Yamaha Motor Co., Ltd (LIT-11616-13-22) | Service Manual Archive.

  • General Specifications: Features a 386 cc, air-cooled, 4-stroke, SOHC, single-cylinder engine with a 5-speed transmission, delivering 920 kPa (131 psi) at 350 r/min.
  • Maintenance Schedule: Recommends checks every 1, 3, 6, and 12 months, including valve clearance adjustments and spark plug inspections for optimal performance.
  • Engine Overhaul Procedures: Details the removal and disassembly of key engine components like the carburetor, oil filter, and clutch for comprehensive servicing.
  • Chassis Specifications: Includes a steel tube frame, double wishbone front suspension, and Swingarm rear suspension for stable handling.
  • Electrical System Overview: Covers ignition, starting, and charging systems, with circuit diagrams and troubleshooting guidance for all electrical components.
  • Torque Specifications: Provides precise tightening values for various fasteners, ranging from 10 Nm (7.2 ft-lb) for oil filter covers to 130 Nm (94 ft-lb) for crankshaft nuts.

Manual Description & Preview

Yamaha Big Bear 400, YFM400FWNM, YFM400FNMC ATV Service Manual Library-Master

Technical-Benchmarks: 2000-2001 | Model-Portfolio: ATV | Technical-Benchmarks: Service Manual

Service-Nexus Value Calibration-Spec
Engine Type Air-cooled 4-stroke, SOHC 386 cm³
Transmission Constant mesh 5-speed forward, 1-speed reverse 5-speed
Front Suspension Double wishbone N/A
Rear Suspension Swingarm (monocross) N/A
Ignition System C.D.I. N/A

Service sections detail recommended inspections and adjustments for ensuring reliable machine operation and a longer service life. Procedures cover engine, chassis, and electrical systems.

FAQ

What are the **proper** engine idle speed specifications? keyboard_arrow_down

1,450-1,550 r/min is the specified engine idling speed for the Yamaha Big Bear 400.

Specify the **standard** torque specifications for the cylinder head. keyboard_arrow_down

40 Nm (4.0 m·kg, 29 ft·lb) for M10 bolts and 20 Nm (2.0 m·kg, 14 ft·lb) for M8 bolts are specified for the cylinder head.

What is the **necessary** procedure for inspecting the brake pads? keyboard_arrow_down

Inspect the brake pads for wear indicators; when they almost touch the brake disc, replace them as a set.

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