1965-1977 Honda CB450 / CB500T Service Manual

1965–1977 Honda CB450 and CB500T Twin-Cylinder Service Documentation

• Covers 1965–1977 Honda CB450 and 1975–1977 CB500T twin-cylinder motorcycles, including 4-speed and 5-speed transmission variants
• Third-party publication by Clymer/Intertech, copyright 1978, covering 14 years of production changes
• Contains 51 detailed exploded-view diagrams, 9 system-level troubleshooting tables, and 4 engine/clutch specification charts
• Downloads to your account within seconds of checkout
• Unlimited re-downloads tied to the purchase record
• Suitable for printing individual sections for shop-floor use
• Full-text search finds any part number in seconds
• This specific edition provides the necessary model-year transition notes for the CB450 K3 through K7 and the CB500T build variants

Engine and Transmission Walkthrough

This 176-page publication documents the mechanical maintenance and system-level configuration for the iconic Honda twin-cylinder series. The text provides structured data for engine removal, cylinder head refurbishment, camshaft and valve gear adjustment, and crankshaft inspection. Detailed chapters focus on the 5-speed transmission architecture, detailing shift drum and gear fork specifications, while separate sections handle the 4-speed variants. Carburetor maintenance for the Keihin constant-velocity units is outlined with explicit data on float levels, needle settings, and air-screw adjustments, allowing for precise synchronization between the left and right cylinders.

Technical Data Preview

Specification Highlights

The manual includes extensive torque values for engine mounting, front axle assembly, and handlebar components to ensure accurate reassembly. The electrical system section documents charging system output thresholds, ignition timing marks, and battery maintenance. For what an OEM service publication covers, the provided tables offer critical clearance limits for pistons, connecting rods, and cam followers.

Coolant system information is irrelevant for these air-cooled units; however, the manual documents engine oil grades including 10W-40 and 20W-50. Cylinder out-of-round specifications are held at less than 0.0002 inches for standard serviceable operation. Valve clearance for intake and exhaust is specified at 0.0012 inches when cold to ensure proper seating. Breaker point gap is verified at 0.012–0.016 inches in the ignition specification table.

Reference only — always consult a certified technician before performing service on this equipment. This official 176-page Clymer publication covers the 1965–1977 Honda CB450 and 1975–1977 CB500T, documenting engine, chassis, electrical, and fuel-delivery specifications for all twin-cylinder production builds.