Replace your CB500K or CB550 alternator cover gasket with this Alternator Cover Gasket, replacing OEM #11691-323-306.
Key Features
• Alternator cover gasket
• Replaces OEM #11691-323-306
• Honda part name: Gasket, Alternator Cover (As)
• Interchangeable with Honda 11691-323-000
Fitment / Compatibility
• Honda CB500K (1971‑73)
• CB550K (1974‑78)
• CB550F (1975‑77) Supersport
Part Number: 18-6999
Check the listed model and year, then read any fitment notes in the description.
| Make | Model | Year |
|---|---|---|
| Honda | CB550K0 | 1974 |
| Honda | CB550K1 | 1975 |
| Honda | CB550K2 | 1976 |
| Honda | CB550K3 | 1977 |
| Honda | CB550K4 | 1978 |
| Honda | CB550F1 | 1975 |
| Honda | CB550F2 | 1976 |
| Honda | CB550F3 | 1977 |
| Honda | CB500K0 | 1971 |
| Honda | CB500K1 | 1972 |
| Honda | CB500K2 | 1973 |
No listed models match your search.
Free ground shipping over $50
To the USA & Canada. In-stock orders usually ship from our own warehouse the same or next business day.
| Destination | Delivery time |
|---|---|
| USA | 4–7 business days |
| Canada | 2–6 business days |
Ground shipping includes tracking, emailed when your order ships. Need it sooner? Express options are available at checkout.
60-day returns on eligible parts
No restocking fees. Eligible parts must be unused, uninstalled, unaltered and complete. The 60-day window starts when your order is delivered.
Electrical parts are excluded from standard returns. Check return eligibility.
Start your return below. Wait for our instructions before mailing a part back.
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Canada Post Economy: Available at checkout for select small items. Allow 1–3 weeks for delivery. No tracking or insurance is included.
Outside the USA & Canada: Delivery times vary by destination and shipping method. Buyers are responsible for applicable duties, taxes and import fees. We cannot mark orders as gifts.
Frequently Asked Questions
What cover does gasket 18-6999 seal?
It seals the alternator cover on the listed 1971-1973 CB500K and 1974-1978 CB550 engines.
Which Honda alternator-cover gasket does 18-6999 replace?
One gasket is included and cross-references Honda OEM 11691-323-306.
Is this a crankcase-center gasket?
No. It is the shaped gasket for the removable alternator cover on the side of the engine.