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  • 1983-85 Honda CB650SC / CB550SC Valve Cover Gasket ~ Replaces 12391-ME5-306
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Honda CB650SC CB550SC valve cover gasket 12391-ME5-306
Valve cover gasket parts fiche diagram, SKU 12-1023, highlighted reference 5
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60-day returnsEligible unused parts Free ground shippingUSA & Canada over $50
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Honda CB650SC CB550SC valve cover gasket 12391-ME5-306

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Load image into Gallery viewer, Valve cover gasket parts fiche diagram, SKU 12-1023, highlighted reference 5

1983-85 Honda CB650SC / CB550SC Valve Cover Gasket ~ Replaces 12391-ME5-306

12-1023
$39.95 USD
Currently out of stock
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Questions about this part? Contact us 4.8/5 1,355 store reviews
Secure checkoutProtected payment
60-day returnsEligible unused parts Free ground shippingUSA & Canada over $50
Browse all parts
1983-85 Honda CB650SC / CB550SC Valve Cover Gasket ~ Replaces 12391-ME5-306
$39.95 USD
Description

Replace your Nighthawk valve cover gasket with this Fibre-Type Valve Cover Gasket, replacing OEM #12391-ME5-306 / #12391-ME5-000. Fits the CB650SC (1983-85) and CB550SC (1983) Nighthawks.

Key Features
• Fibre-type valve cover gasket
• Replaces OEM #12391-ME5-306 / #12391-ME5-000
• Honda part name: Gasket, Cylinder Head Cover

Fitment / Compatibility

• Honda CB650SC (1983‑85) Nighthawk

• Honda CB550SC (1983) Nighthawk

Part Number: 12-1023

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Check the listed model and year, then read any fitment notes in the description.

Make Model Year
Honda CB650SCD Nighthawk 1983
Honda CB650SCE Nighthawk 1984
Honda CB650SCF Nighthawk 1985
Honda CB550SC Nighthawk 1983

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

How many valve-cover gaskets are included and required?

One fibre-type valve-cover gasket is included, and one is required per CB550SC or CB650SC engine. The gasket replaces Honda OEM 12391-ME5-306 and 12391-ME5-000.

Are valve-cover bolt seals or grommets included with gasket 12-1023?

No. SKU 12-1023 contains the main valve-cover gasket only. Inspect any separate sealing washers, grommets and rubber plugs during disassembly and obtain those parts separately if worn or hardened.

What installation checks help prevent another valve-cover leak?

Remove old gasket residue without gouging the aluminum, clean the mating surfaces, check the cover for damage and tighten the fasteners in the service-manual sequence and torque. Overtightening can distort the cover or damage the new fibre gasket.

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