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  • 1971-78 Honda CB550F / CB550K / CB500K Cylinder Head Cover Gasket ~ Replaces 12391-323-000
Honda CB550F CB550K CB500K cylinder head cover gasket 12391-323-000
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Honda CB550F CB550K CB500K cylinder head cover gasket 12391-323-000

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1971-78 Honda CB550F / CB550K / CB500K Cylinder Head Cover Gasket ~ Replaces 12391-323-000

18-6997
$41.95 USD
In stock Usually ships the same or next business day
Check model fitment View fitment
Questions about this part? Contact us 4.8/5 1,331 store reviews
Secure checkoutProtected payment
60-day returnsEligible unused parts Free ground shippingUSA & Canada over $50
Browse all parts
1971-78 Honda CB550F / CB550K / CB500K Cylinder Head Cover Gasket ~ Replaces 12391-323-000
$41.95 USD
Description

Replace your CB500K or CB550 cylinder head cover gasket with this Cylinder Head Cover Gasket, replacing OEM #12391-323-000.

Key Features
• Cylinder head cover gasket
• Replaces OEM #12391-323-000

Fitment / Compatibility
• Honda CB500K (1971‑73)
• CB550K (1974‑78)
• CB550F (1975‑77) Supersport

Part Number: 18-6997

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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

Free ground shipping over $50

To the USA & Canada. In-stock orders usually ship from our own warehouse the same or next business day.

Estimated ground delivery after your order ships
DestinationDelivery time
USA4–7 business days
Canada2–6 business days

Ground shipping includes tracking, emailed when your order ships. Need it sooner? Express options are available at checkout.

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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.

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Other shipping options

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 does cylinder-head cover gasket 18-6997 seal?

It seals the top cylinder-head or valve cover on the listed CB500K, CB550K and CB550F engines.

Which Honda cover-gasket number does 18-6997 replace?

One gasket is included and cross-references Honda OEM 12391-323-000.

Is this the cylinder-head gasket?

No. The cover gasket seals the removable top cover; the cylinder-head gasket seals between the head and cylinder block.

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