1985-1988 Yamaha YFM80N Service Manual

Technical reference for YFM80N including parts diagrams and service data. Documents engine, chassis, and electrical system repairs. LIT-11616-04-84

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Document Details

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Document Number / Seller:
30149 / Amanda Robinson
File Size:
49.33 MB
File Type:
PDF
Language:
English
Printable:
Yes
Category:
ATV
Last updated / verified
Aug 6, 2025

Models Covered & Key Technical Specifications

Definitive Procedure Technical Manual: ATV Yamaha YFM Moto 80, YFM80N manual, covers 1985-1988 Procedure-Database

ATV Manual | Consolidated Edition.

  • Published Climate Parameters: 15-30C defines the environmental limit Framework.
  • Measured Processing Speed: 1200 dpi establishes the maximum print output Architecture.
  • Approved Component Weight: 99 kg (218 lb) signifies the active printing consumption Threshold.
  • Reference Tension Specs: For optimal operation, 6 mm (0.24 in) establishes the calibration settings Norms.
  • Fundamental Holding Capacity: The formatter board requires 64 MB for standard operation Logic.
  • Universal Ambient Limits: Maximum throughput reaches 25 ppm Parameters.

Professional Workshop Service Manual & Technical Specifications

Definitive Procedure Technical Manual: ATV Yamaha YFM Moto 80, YFM80N manual, covers 1985-1988 Procedure-Database

Engineering-Base: 1985-1988 Yamaha YFM Moto 80 (LIT-11616-04-84) // Engine-Type: ATV / Yamaha Motor Company Logic // Engineering-Base: service manual.

Technical Specs Table

Metric Baseline Calibration-Data
Model Code Number 55X YFM80N
Overall Length 1,415 mm (55.7 in) 825 mm (32.5 in)
Engine Type 4-stroke, gasoline, SOHC Single cylinder, Forward inclined
Bore x Stroke 47.0 x 45.6 mm (1.850 x 1.795 in) 9.5

Table

Metric Baseline Calibration-Data
Model Code Number 55X YFM80N
Overall Length 1,415 mm (55.7 in) 825 mm (32.5 in)
Engine Type 4-stroke, gasoline, SOHC Single cylinder, Forward inclined
Bore x Stroke 47.0 x 45.6 mm (1.850 x 1.795 in) 9.5

Table

Metric Baseline Calibration-Data
Model Code Number 55X YFM80N
Overall Length 1,415 mm (55.7 in) 825 mm (32.5 in)
Engine Type 4-stroke, gasoline, SOHC Single cylinder, Forward inclined
Bore x Stroke 47.0 x 45.6 mm (1.850 x 1.795 in) 9.5

Technical content addresses engine, chassis, electrical systems, and troubleshooting. Procedures for removal, inspection, and installation are documented. Specifications for all major components are included. The manual provides a complete interface for understanding the vehicle's Reliable systems.

Procedures

The document includes coverage of engine removal and disassembly, transmission, clutch, and cylinder head procedures. Brake system specifications are included for front and rear brakes, including lining inspection and adjustments. Safety procedures are documented for various operations. Fluid capacities are listed for engine oil and final gear grease. Tool requirements are listed for specific tasks like valve adjustment and bearing replacement.

Specifications

Specifications for the engine, transmission, and chassis are provided in detail. This includes dimensions, clearances, wear limits, and tightening torques for critical fasteners. Electrical system specifications cover component resistance values and system voltage outputs. These technical details ensure that all repairs and adjustments meet factory standards.

Systems

The manual documents the operation and maintenance of the engine, starting system, charging system, and ignition system. It details the function of each component and how they work together. Wiring diagrams and exploded views are provided to aid in understanding the system architecture.

Table

Metric Baseline Calibration-Data
Model Code Number 55X YFM80N
Overall Length 1,415 mm (55.7 in) 825 mm (32.5 in)
Engine Type 4-stroke, gasoline, SOHC Single cylinder, Forward inclined
Bore x Stroke 47.0 x 45.6 mm (1.850 x 1.795 in) 9.5

Systematically requiring proper assembly, the manual documents torque specifications for critical engine components to ensure proper bearing preload accuracy.

FAQ

What **necessary** electrical values are listed for the ignition system? keyboard_arrow_down

1.6kΩ ± 10% is listed for the primary ignition coil resistance.

Determine the **recommended** calibration settings for the engine. keyboard_arrow_down

1,775 kPa (12.0 kg/cm², 171 psi) is the standard compression pressure for the engine.

What **calibrated** clearance measurements are provided for the exhaust valve? keyboard_arrow_down

0.075 - 0.125 mm (0.003 - 0.005 in) is the clearance measurement for the exhaust valve at sea level.

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Reviews (2)

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This service manual was exactly what I needed for my 1987 Yamaha YFM Moto 80. The details on troubleshooting and engine maintenance are incredibly helpful. Downloading was a breeze, and I appreciated the quick email with the link. Highly recommend!
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I found this manual to be very thorough and easy to understand. The support team was prompt in responding to my questions, which made the whole process smooth. The lifetime guarantee on the download is a nice touch!