2000-2006 Yamaha YFM400FWNP Big Bear 400 Service Manual

Field service reference for differential gear lash, drive train assemblies, and 2WD/4WD selector systems. Complete electrical diagnostics with wiring schematics, brake adjustment procedures, and ignition/starting system troubleshooting. Factory documentation LIT-11616-15-22.

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Technical Safety Notice
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This official OEM document is intended for professional technicians and skilled operators. Performing service on mechanical equipment involves inherent risks. By purchasing, you acknowledge that RepairLoader provides original manufacturer data for informational purposes. Always prioritize safety: use correct tools, wear protective gear, and consult a certified professional if you are uncertain of any procedure.

Yamaha Models Covered & Key Technical Specifications

Models: Yamaha YFM400FWNP Big Bear 400
Build Years: 2001
Technical Data:

  • Engine idle speed: 1,450 ~ 1,550 r/min
  • Intake vacuum: 33.3 kPa (250 mmHg, 10 inHg)
  • Pickup coil resistance: 459 ~ 561 ohms at 20 °C (68 °F)
  • Caster angle: 4°
  • Kingpin angle: 13°
  • Headlight bulb: 12 V 30 W/30 W × 2
Technical Specifications
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Document Number / Seller:
24718 / Kevin Thomas
File Size:
43.78 MB
File Type:
PDF
Language:
English
Pages:
427
Printable:
Yes
Category:
ATV
Last updated / verified
Mar 15, 2026

Yamaha Manual Features & Content Preview

Yamaha YFM400FWNP Big Bear 400 Supplementary Service Manual

  • Covers the 2001 Yamaha YFM400FWNP Big Bear 400 all-terrain vehicle
  • Official Yamaha publication P/N LIT-11616-15-22, first edition June 2001
  • Contains 12 exploded-view diagrams and 18 circuit diagnostic charts
  • Files are available immediately after purchase as a direct download
  • Indexed PDF structure allows for fast navigation through technical sections
  • This 2001 supplementary manual is required for service operations on the YFM400FWNP, referencing the base YFM400FWNM/NMC service manual for complete procedure steps

Manual Documentation Scope

This supplementary service publication details critical mechanical and electrical data specific to the 2001 Yamaha YFM400FWNP. Sections provide refined specifications for engine parameters, chassis geometry, and electrical system diagnostics, including wiring schematics for the ignition, starting, lighting, signal, and 2WD/4WD selecting systems. The content organizes troubleshooting logic for electrical failures, guiding technicians through terminal continuity tests, component resistance checks, and circuit voltage verifications.

Technical Data Preview

Engine idle speed is documented at 1,450 ~ 1,550 r/min in the specification section. Intake vacuum for the 2001 Yamaha YFM400FWNP is listed at 33.3 kPa (250 mmHg, 10 inHg). The pickup coil resistance is specified at 459 ~ 561 ohms at 20 °C (68 °F). Front axle geometry is defined with a 13° kingpin angle and a 4° caster angle. Electrical system references include bulb wattage for the dual 12 V 30 W/30 W headlight setup. Note: This page is a contents overview for the manual. It does not provide repair or diagnostic instructions. This official 52-page Yamaha OEM service supplement covers the 2001 YFM400FWNP, documenting specialized engine, chassis, and electrical specifications for the 5FUA build.

Manual FAQ, Purchase & Download Details

Does this Supplementary Service Manual include information for the YFM400FWNP model? keyboard_arrow_down

Yes, this manual is specifically prepared to introduce new service and new data for the YFM400FWNP model.

Are there exploded diagrams included in the document for identifying components? keyboard_arrow_down

Each chapter includes exploded diagrams before the corresponding sections to assist with the identification of parts and assemblies.

Does the manual provide tightening torque specifications for engine and chassis fasteners? keyboard_arrow_down

Yes, the document contains comprehensive maintenance specification tables that list torque values for various parts including engine stays, differential gear cases, and steering components.

Can I find electrical system reference values in this manual? keyboard_arrow_down

Manual includes electrical specification sections that list reference values for components such as the pickup coil resistance, ignition timing data, and regulated voltage ranges.

Is the document available as a downloadable PDF file? keyboard_arrow_down

Yes, this product is provided in a standard PDF format for immediate download upon purchase, consisting of 427 pages of service information.

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