1981 Honda CB650C Parts

Parts and fitment guide for your 1981 CB650C

This collection brings together listed repair and maintenance parts for the 1981 Honda CB650C Custom. Confirm the exact model and fitted component; a shared CB650 name does not make every Standard, Custom and Nighthawk part interchangeable.

Browse by repair

• Engine parts — engine seals, hardware and service items.
• Fuel-system parts — carburetor, intake and air-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 1981 CB650C

Check each listing for model fitment, dimensions and included quantities.

• Fork oil seals — 35 × 48 × 10.5/11 mm seal set; compare the fitted forks.
• Oil filter — stock-type paper element; housing seals and hardware are separate.
• Oil-filter washers — pack of five washers for the listed original-type paper-filter assembly.

Identify your CB650C (1981)

Match your motorcycle to its original-market documentation.

• Identifiers to compare — complete frame/VIN and engine markings

Treat the merchant model chart as a reference, not a confirmed production cutoff.

View the model reference chart

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

Match clamps to the replacement holders

The 1981 Custom holder set 73-0134 supplies four engine-side rubbers. If clamps need replacement, its listing specifies eight 50–52mm band clamps 15-0689 or eight gear clamps 15-0670. Choose clamps for these replacement holders, rather than borrowing the smaller band-clamp specification from the 1979 Standard set.

Fitment questions

What measurement qualifies the listed accelerator-pump diaphragm? Pump kit 20-9040 lists the 1981 CB650C only when the removed diaphragm requires an 89mm end-to-end pin. Measure that pin before ordering; the kit includes the diaphragm with rod and bellow rubber.

Does the clutch cable have to be identified as a Custom part? The listed 51-3543 cable replaces 22870-460-700 and covers the 1980–81 CB650C. Match the cable ends and actual handlebar route, especially after control changes, instead of selecting a cable from a general CB650 label.

Related CB650C collections

• 1980 CB650C parts
• All CB650C Custom parts

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