1964-1975 Honda 90/125cc Service Manual | Complete Vintage Motorcycle Repair Guide

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Preserving Honda's Small-Bike Legacy

This official factory manual provides the original specifications and procedures for Honda's legendary 90cc and 125cc motorcycles - the bikes that introduced millions to motorcycling. Essential for collectors and restorers maintaining these vintage machines.

Complete Coverage Includes:

Air-Cooled Engine Rebuild: Detailed procedures for Honda's OHC singles including:

Points ignition timing and gap
Valve adjustment specs
Cylinder head torque sequence

Vintage Carburetion: Complete tuning for the Keihin or Mikuni carbs including:

Jetting specifications
Float height adjustment
Throttle cable routing

Pro Tip: The manual includes the factory-recommended break-in procedure that differs significantly from modern bikes.

3-Speed Transmission: Proper adjustment of the semi-automatic "Hondamatic" system.

Models & Years Covered:

1964

1965

1966

1967

1968

1969

1970

1971

1972

1973

1974

1975

All 90cc and 125cc models including CT90 Trail, SL90, and CB125 variants.

Key Technical Specifications

Engine: 89cc/124cc air-cooled SOHC single-cylinder
Power: 5-10 HP (varies by model)
Transmission: 3/4-speed manual or semi-automatic
Ignition: Points/condenser system
Weight: 150-200 lbs (varies by model)

Special Tool Requirements:

The manual includes Honda's recommended vintage tools:

Flywheel puller
Points gap gauge
Valve adjustment tool
Clutch holding tool

Frequently Asked Questions

Q: Does this cover both the 90 and 125cc models?

A: Yes, includes all specifications for both displacements with differences clearly noted.

Q: Are the CT90 Trail models included?

A: Yes, complete with the dual-range transmission service procedures.

Q: Can I use this for later model years?

A: This manual specifically covers 1964-1975. Later models had significant changes.

Own a Piece of Motorcycle History

Properly maintain your vintage Honda with factory-approved procedures!

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