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Honda CB Cylinder Head Gasket ~ Replaces 12909-428-003

$2.95 USD
73-1186
Restore top-end sealing performance with this high-quality Cylinder Head Gasket. Designed to match OEM specifications, this gasket ensures a perfect fit and proper sealing...

1966 Honda CB450K · Gaskets & Oil Seals & Engine Hardware Buying guide

Distinguish the stud seal from the main head gasket

Honda identifies reference 12909-283-000 as a cylinder-stud gasket. The offered small seal is different from the broad gasket surrounding the combustion chambers and is not a complete top-end gasket set.

Use the reference to identify the component

The important distinction is the 12909-series cylinder-stud seal. A general cylinder-head description can refer to more than one sealing component. Match the old part with the illustrated engine parts list and its reference so a small seal is not mistaken for the combustion gasket.

Plan the rest of the service separately

This selection does not establish a complete head, base and cover gasket package. If your job opens other engine joints, identify their sealing parts separately. Confirm the supplied quantity of this seal and any additional pieces needed before treating the order as complete.

Buying questions

Can this replace the gasket around the combustion chambers?

No. This is the small cylinder-stud seal identified by the 12909-series reference. It is a different component from the full head gasket. Ordering it alone does not provide the broad gasket needed for that joint.

How can I distinguish it from other small engine seals?

Use the illustrated parts list for the engine and compare the removed seal, its location and reference. The offered listing gives 12909-428-003, 12909-283-000 and 12909-333-000; do not substitute another similar-looking O-ring or rubber piece by shape alone.

Does the listing establish a complete top-end sealing kit?

No complete top-end kit contents are stated for this item. Treat it as the identified stud-seal component and confirm the supplied quantity. Head, base, cover and other sealing parts needed for your particular job must be checked separately.

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