1978-1986 Honda CX500C Service Manual

Technical Scope for the Honda CX/GL500 & 650 V-Twins

• Covers 1978–1986 Honda CX500, CX650, GL500, and GL650 V-Twin motorcycles, including Custom, D, E, and Interstate variants
• Original OEM manufacturer publication Haynes Owners Workshop Manual, documenting technical data for liquid-cooled V-twin power units
• Contains 83 high-quality technical diagrams, exploded-view illustrations, and comprehensive wiring schematics for early and late-model ignition systems
• Accessible from your device as soon as the order is placed
• Stored against your account so you can retrieve it after a hard-drive loss
• Full-text search finds any part number in seconds
• Suitable for printing individual sections for shop-floor use
• This 1978–1986 Haynes manual remains the primary reference for servicing the V-twin engine and mechanical systems unique to the CX and GL series

Component and System Coverage

This manual details service procedures for the CX500 and GL500 engine, clutch, and gearbox assemblies. Coverage includes cylinder head removal, valve adjustment, camshaft inspection, and maintenance of the timing chain and tensioners. The document guides technical review of the cooling system, including radiator removal, water pump renovation, and thermostatic switch testing. Extensive sections are dedicated to the fuel system, detailing the Keihin carburetor components, float height measurement, and synchronization procedures for both 500 and 650 series models. The manual also outlines frame inspection, steering head bearing maintenance, and swinging arm adjustment for these classic V-twin machines.

Technical Data Preview

Detailed specifications are provided for the lubrication system, recommending SAE 10W/40 oil and listing specific capacities for the 500 and 650 series. Torque data is clearly documented for critical fasteners, such as exhaust pipe clamps at 1.8–2.8 kgf m and cylinder head nuts. Electrical data includes fuse ratings, spark plug specifications (NGK/Nippodenso), and comprehensive wiring connection charts. Reference values for the ignition system, including pulse coil resistance and advance timings, are included to assist in fault diagnosis. Coolant system capacity for the 1980–1986 models is documented at up to 19.0 liters depending on the specific tank configuration. Valve clearance for intake and exhaust is listed in the main specification table. The Honda CX500 idle speed is specified at 1100 ± 100 rpm.

Note: All service data shown here is for reference only — qualified technicians and the original OEM documentation remain the authoritative source for any hands-on work. An official Haynes workshop manual covering the 1978–1986 Honda CX/GL500 & 650 series, documenting engine, chassis, cooling, fuel, and electrical specifications for the V-twin builds.