1978 Honda CB550K Parts

Parts and fitment guide for your 1978 CB550K

This collection covers listed repair and maintenance parts for the 1978 Honda CB550K, catalogued here as CB550K4. Use the year and model together when matching carburetors, intake parts and controls.

Browse by repair

• Engine parts — engine seals, hardware and service items.
• Fuel-system parts — carburetor, intake and filter listings.
• Electrical parts — ignition and electrical service items.
• Brake & clutch parts — braking and clutch repair listings.
• Suspension & wheels — fork seals, wheel parts and tools.
• Exhaust parts — exhaust components and hardware.

Selected parts for the 1978 CB550K

Check the listed application, dimensions and included quantity before ordering.

• Carb screw kit — screw and drain-screw set specifically listed for the 1977–78 CB550K.
• Clutch cable — listed for 1974–78 CB550K and 1975–77 CB550F; check routing and handlebar changes.
• Oil filter — paper filter element; O-rings and housing hardware are separate.

Identify your CB550K (1978)

Use the model year together with the motorcycle’s original market when matching parts.

• Identification evidence — record the complete frame/VIN and engine stampings, not just the registration year.

Use the linked chart as an identification aid, not as a verified factory serial range.

View the model reference chart

For help locating identifiers, use our Honda CB model guide.

Check kit contents before starting

For the 1978 CB550K, rebuild kit 48-1999 and screw kit 49-0004 cover different parts of the job. The rebuild kit lists the internal repair parts; the screw kit itemises four drain screws with O-rings, eight 4 × 12 screws and twelve 4 × 16 screws with lock washers. Check damaged hardware separately from the metering and sealing components.

Fitment questions

Does the earlier fuel-connector O-ring kit list the 1978 K? Kit 48-0791 stops its CB550K coverage at 1976; its description does not establish a 1978 application. Identify the leaking connector and compare the fitted tubes and seals, then obtain confirmation for the later K model before ordering.

Can the steering-bearing kit be chosen from its 1977 K application? Kit 28-2011 lists CB550K through 1977 and does not establish its 1978 application. Do not fill that gap from the adjacent year. Compare the installed steering assembly and obtain confirmation before ordering, particularly on a motorcycle with a replacement front end.

Related CB550K collections

• 1977 CB550K parts
• All CB550K parts

Need help checking a part? Contact VintageCB750 with the model year, original market, frame and engine markings, and component photos.