1979-1982 Honda CB650 Factory Shop Manual (P/N 07703-0010100, 07716-0020202)
Honda Models Covered & Key Technical Specifications
Models: Honda CB650
Model Years: 1979–1982
Technical Data:
- Engine type: Air-cooled 4-stroke, vertical in-line four
- Displacement: 627 cc
- Bore and stroke: 59.8 x 55.8 mm
- Compression ratio: 9.0:1
- Transmission: 5-speed constant-mesh
- Final drive: Chain (RK50NK or DID 50HDK, 102 links)
- Fuel system: Four PD50A carburetors
- Ignition system: Transistorized with electronic ignition timing
- Frame type: Double cradle
- Front suspension: Telescopic fork, 142 mm travel
- Rear suspension: Swing arm, 77 mm travel
- Brakes: Front disc brake, rear internal expanding shoe
- Engine oil capacity: 3.5 liters (3.7 US qt) at engine assembly, 3.0 liters (3.2 US qt) at change
- Spark plug gap: 0.6–0.7 mm (0.024–0.028 in)
- Compression pressure: 12 ± 2 kg/cm² (170 ± 28 psi)
Honda Manual Features & Content Preview
Original OEM publication (07703-0010100, 07716-0020202) issued in December 1978 for the air-cooled, in-line four-cylinder platform. This 100-page factory reference lays out the exact inspection parameters and structural tolerances needed to rebuild or service the base model CB650 architecture.
- Provides 47 exploded-view diagrams that map out complex assembly sequences.
- Includes comprehensive electrical wiring schematics for diagnosing charging and ignition faults.
- Features detailed torque-specification tables for critical engine and chassis hardware.
Component Documentation
Tackling a vintage four-cylinder requires accurate data. This manual breaks down the complete powertrain, starting with carburetor bank removal, disassembly, and the critical synchronization procedures. From there, it dives directly into the cylinder head and valve train. You get the factory clearances and testing methods required for a proper rebuild. Beyond the engine block, the text outlines maintenance for the double cradle frame, telescopic forks, and swing arm suspension. Full-page wiring diagrams map out the ignition timing, charging system, and starter motor circuits. If you are tracking down a mechanical or electrical gremlin, the dedicated troubleshooting chapters isolate faults systematically.
Specification Previews
To give an idea of the technical depth, engine compression pressure stands at a standard 12 ± 2 kg/cm². The cylinder head specification tables mandate a tight 0.05 mm intake valve clearance, while the exhaust side needs 0.08 mm. Reassembling the case halves? Crankcase bolt torque must be dialed to exactly 2.2–2.6 kg-m for structural integrity. The wet sump system relies on a precise 3.0-liter oil capacity. You will also find component-specific service limits, such as rotor-to-pump body clearances and drive chain free-play limits of 15–25 mm. Working on vintage motorcycle powertrains carries inherent physical risks. To ensure safe and reliable operation, always verify these figures against the full factory documentation before starting any hands-on maintenance.
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