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Honda CB900 CB750 cylinder base gasket Athena premium quality 12191-425-306
1979-83 Honda CB900 / CB750 Cylinder Base Gasket ~ Athena Premium Quality ~ Replaces 12191-425-306, SKU 18-6991: product photo and reviewed parts fiche. Example diagram; check listing for fitment.
Honda CB900 CB750 Athena cylinder base gasket – rendered product view
Honda CB900 CB750 cylinder base gasket Athena premium quality 12191-425-306 – rendered rear view
Honda CB900 CB750 cylinder base gasket Athena premium quality 12191-425-306 – rendered top view
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Honda CB900 CB750 cylinder base gasket Athena premium quality 12191-425-306

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Load image into Gallery viewer, Honda CB900 CB750 cylinder base gasket Athena premium quality 12191-425-306
Load image into Gallery viewer, 1979-83 Honda CB900 / CB750 Cylinder Base Gasket ~ Athena Premium Quality ~ Replaces 12191-425-306, SKU 18-6991: product photo and reviewed parts fiche. Example diagram; check listing for fitment.
Load image into Gallery viewer, Honda CB900 CB750 Athena cylinder base gasket – rendered product view
Load image into Gallery viewer, Honda CB900 CB750 cylinder base gasket Athena premium quality 12191-425-306 – rendered rear view
Load image into Gallery viewer, Honda CB900 CB750 cylinder base gasket Athena premium quality 12191-425-306 – rendered top view

1979-83 Honda CB900 / CB750 Cylinder Base Gasket ~ Athena Premium Quality ~ Replaces 12191-425-306

18-6991
$22.18 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 1,329 store reviews
Secure checkoutProtected payment
60-day returnsEligible unused parts Free ground shippingUSA & Canada over $50
Browse all parts
1979-83 Honda CB900 / CB750 Cylinder Base Gasket ~ Athena Premium Quality ~ Replaces 12191-425-306
$22.18 USD
Description

Replace your DOHC CB's cylinder base gasket with this Athena Premium Quality Cylinder Base Gasket, replacing OEM #12191-425-306.

Key Features
• Athena premium cylinder base gasket
• Replaces OEM #12191-425-306
• Top-quality ISO-9000 approved

Fitment / Compatibility

• Honda CB750K (1979‑82)
• CB750F (1979‑82) Supersport
• CB750L (1979) Limited Edition
• CB750C (1980‑82) Custom

• Honda CB750SC (1982‑83) Nighthawk

• Honda CB900C (1980‑82) Custom
• CB900F (1981‑82) Supersport

Part Number: 18-6991

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

Make Model Year
Honda CB750K Standard 1979
Honda CB750F Supersport 1979
Honda CB750L Limited 1979
Honda CB750K 1980
Honda CB750F 1980
Honda CB750C Custom 1980
Honda CB750K 1981
Honda CB750F 1981
Honda CB750C 1981
Honda CB750K 1982
Honda CB750F 1982
Honda CB750C 1982
Honda CB750SC Nighthawk 1982
Honda CB750SC 1983
Honda CB900C Custom 1980
Honda CB900C 1981
Honda CB900F Supersport 1981
Honda CB900C 1982
Honda CB900F 1982

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

Which DOHC Honda CB engines use Athena base gasket 18-6991?

It fits the listed 1979-1983 CB750 and 1980-1982 CB900 engines and is the premium Athena-brand option.

Which Honda cylinder-base gasket does 18-6991 replace?

One base gasket is included and cross-references Honda OEM 12191-425-306.

Where does the cylinder-base gasket seal?

It seals the joint between the cylinder block and crankcase; the cylinder-head gasket above the block is separate.

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