1985-1988 Yamaha Badger 80 / YFM80 Service Manual

Shop manual for the Yamaha Badger 80 / YFM80 with detailed diagrams and specifications. Covers engine, chassis, electrical, and more. Part numbers included for easy component identification. PN 55X-000101.

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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 Badger 80, YFM80
Build Years: 1985–1988
Serial Numbers: JYA55X00*FC000101, 55X-000101
Technical Data:

  • Engine type: 4-stroke
  • Idle speed: 1,800 ± 50 r/min
  • Compression pressure (standard): 1,177 kPa (12 kg/cm², 171 psi)
  • Intake valve clearance (cold): 0.05–0.10 mm (0.002–0.004 in)
  • Exhaust valve clearance (cold): 0.075–0.125 mm (0.003–0.005 in)
  • Engine oil capacity: 0.85 L (0.75 Imp qt, 0.88 US qt)
  • Tire pressure (standard): 19.6 kPa (0.2 kg/cm², 2.8 psi)
  • Main jet: #80
  • Main fuse: 10A
Technical Specifications
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Document Number / Seller:
26799 / Elizabeth Diaz
File Size:
39.64 MB
File Type:
PDF
Language:
English
Pages:
173
Printable:
Yes
Category:
ATV
Last updated / verified
Apr 18, 2026

Yamaha Manual Features & Content Preview

1985–1988 Yamaha Badger 80 Technical Documentation

  • Covers the 1985–1988 Yamaha Badger 80 (YFM80), including technical specifications for the 55X-series engine and chassis components
  • Official Yamaha service publication for the YFM80, documenting all engine, electrical, and carburetor maintenance parameters
  • Features 147 exploded-view diagrams detailing component assembly, lubrication points, and internal engine tolerances
  • 173 pages covering specialized tune-up requirements and chassis inspection intervals
  • Delivered as a direct download the moment payment clears
  • Full-text search finds any part number in seconds
  • This edition is the factory-authorized reference used for the 1985–1988 YFM80 series, detailing the specific internal clearances and torque values for the 4-stroke engine architecture

What the Manual Documents

The 1985–1988 Yamaha Badger 80 service manual details every essential system for the YFM80, beginning with machine identification and special service tools. Chapter sections outline periodic maintenance and lubrication cycles, followed by a thorough overview of the engine overhaul process including crankcase, cylinder head, and transmission disassembly.

Additional chapters explain the carburetor and chassis systems, covering front and rear wheel service, brake adjustment, and steering system inspection. The final sections include detailed electrical component diagnostics and supplemental appendices for technical reference.

Specification Highlights

Technical data provides precise tolerance charts for engine parts, including piston clearance and valve seat width specifications. Valve clearance for the intake is listed at 0.05–0.10 mm in the cylinder head specification table. Compression pressure for the 1985–1988 Yamaha Badger 80 is documented at 1,177 kPa at sea level. The YFM80 carburetor main jet is factory specified at #80 for optimal fuel performance. what an OEM service publication covers

All service data shown here is for reference only — qualified technicians and the original OEM documentation remain the authoritative source for any hands-on work. An official 173-page Yamaha OEM workshop manual covering the 1985–1988 Yamaha Badger 80, documenting engine, chassis, electrical, and fuel-system specifications for the 55X-series production run.

Manual FAQ, Purchase & Download Details

Which chapters in the Yamaha Badger 80 manual provide reference charts for engine technical data and periodic maintenance intervals? keyboard_arrow_down

General Information and Periodic Inspections and Adjustments chapters contain summary tables that list recommended maintenance schedules and technical specification categories. These sections provide documented reference ranges for items like valve clearances and idling speeds.

Are specific illustrations and defined symbols provided to explain the diagrams throughout the document? keyboard_arrow_down

Manual includes a dedicated section at the beginning that lists and defines all illustrated symbols used to identify component parts, lubrication points, and technical specifications across the exploded views.

Is the electrical system covered with diagrams and component reference data for ignition and testing? keyboard_arrow_down

Manual includes an Electrical chapter which provides content related to ignition timing, battery inspection, and spark plug status. Technical references and specific tools for evaluating electrical components are listed in the introductory sections. These pages provide the necessary context for understanding the electrical layout.

What format is the Yamaha Badger 80 service manual provided in upon purchase? keyboard_arrow_down

Document is delivered in a high-resolution PDF format designed for instant access and viewing on various devices.

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