1977-1982 Honda NC50 Express / NA50 Express II Service Manual

Technical reference for NC50 and NA50 models, covering engine, frame, electrical systems, and more. Includes part number AH22008109C for detailed service information.

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Document Details

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Document Number / Seller:
26430 / Donna Bell
File Size:
37.19 MB
File Type:
ZIP
Language:
English
Printable:
Yes
Category:
Moped
Last updated / verified
Jun 23, 2025

Models Covered & Key Technical Specifications

Honda NC50 Express / NA50 Express II (AH22008109C) - 1977-1982

Technical • Integrated • Repository | Series Repository.

  • Engineered Interference Fit: 0.05 mm establishes the standard clearance requirement for components.
  • Design Circuit Specs: For optimal performance, 6V 4AH provides the required electrical energy storage.
  • Documented Climate Parameters: 10°C (50°F) governs the operation in cold environmental conditions.
  • Principal Physical Specs: The overall length is 1,550 mm (61 in.) for standard operation.
  • Advanced Coupling Torques: 90-120 kg-cm signifies the torque for cylinder head nuts.
  • Primary End Play: 0.6mm determines the acceptable end play for piston rings.

Professional Workshop Service Manual & Technical Specifications

Factory-Level Workshop Overhaul Manual: Honda NC50 Express / NA50 Express II - 1977-1982 Wiring-Compendium

Engineering-Metrics: NC50 / NA50 / 1977-1982 // Specification-Class: Moped / Engine Logic // Engineering-Metrics: Technical-details.

TOP Integrated-Framework Rating Context
Engine Type 2-stroke Air-cooled
Displacement 49cc Standard
Ignition System CDI Component
Front Suspension Telescopic fork Standard
Rear Brake Internal expanding shoes Component

Engineering chapters address the NC50 and NA50 Express models, detailing their unique components and maintenance procedures. This manual serves as a reference for the mechanical and electrical systems, providing essential information for diagnosis and repair.

Reference data is included for

various systems, including the carburetor, lubrication, and starting mechanisms, ensuring a complete understanding of their operation.

This manual covers

the complete tear-down and reassembly of the engine, clutch, transmission, and associated components, facilitating detailed overhauls.

Diagnostic procedures are covered for

electrical issues, offering insights into troubleshooting the ignition, charging, and lighting systems.

Properly requiring specifications for component reassembly to ensure proper cyclic stress resistance.

FAQ

Calculate the **precise** pressure specifications for the NC50 Express. keyboard_arrow_down

2.25 – 14 – 4 PR 21 psi (1.5kg/cm²) specifies the front tire pressure for the NC50 Express.

What values ensure **proper** assembly sequence for the NA50? keyboard_arrow_down

Page 10-2 details the proper piston ring assembly sequence, ensuring the correct orientation and fitment for optimal engine performance.

Assess the **standard** service interval parameters for the NC50. keyboard_arrow_down

The service interval for the fuel filter screen is 'C' (Clean) every 6 months or 1,500 km (1,000 miles) for standard operation, as detailed on page 31-8.

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Reviews (4)

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Rated 4 out of 5 stars
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This shop manual is a must-have for anyone with a 1977-1983 Honda NC50 or NA50. The detailed sections on engine removal and carburetor adjustments saved me a lot of time!
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The troubleshooting section helped me diagnose a stubborn issue quickly. Highly recommend this manual!
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Had a question about the download process and received a prompt reply. The download was seamless. Very professional service!