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1968 Honda CB450K Engine Gaskets & Oil Seals

A sealing order for a 1968 Honda CB450K begins with a list of the joints and seal positions being opened. Compare gasket sets with the separate oil-seal kit, and identify the small cylinder-stud seal before treating it as a larger gasket.

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Currently viewing Gaskets & Oil Seals & Engine Hardware

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Honda CB500 CB450 CL450K1 CL450K2 CL450K3 overhaul gasket set

Honda CB Overhaul Gasket Set

$64.95 USD
18-0098
Rebuild your CB500T or CB450/CL450 engine with this Engine Overhaul Gasket Set.Note: fits 5-speed CB450K models only.Key Features• Engine overhaul gasket set• For 5-speed...
New
Honda CB450 CL450 CB500T engine oil seal kit with 7 seals 91202-283-013

1968-76 Honda CB450 / CL450 / CB500T Engine Oil Seal Kit

$21.95 USD
01-9926
Refresh critical engine sealing points with this Engine Oil Seal Kit (7 Pieces), designed to replace common oil seals used in the engine assemblies...
Honda CB500 CB450 CB400 CB360 CB350 cylinder head gasket 12909-428-003

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...
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Honda CB450 CL450K2 CL450K3 CL450K4 CL450K5 Athena overhaul gasket set

Honda CB Athena Overhaul Gasket Set

$99.95 USD
18-0297
Rebuild your CB450K or CL450K engine with this Athena Overhaul Engine Gasket Set. Athena of Italy is an original-equipment supplier to Yamaha, Honda, Kawasaki,...
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1968 Honda CB450K · Gaskets & Oil Seals & Engine Hardware Buying guide

Identify each sealing position

The two overhaul gasket sets, the seven-piece oil-seal kit and the small cylinder-stud gasket are distinct choices. Package names do not prove every seal is included. The five-speed restriction on one gasket set also needs an engine check.

Parts to consider

Honda CB Overhaul Gasket Set Five-speed engine gasket setOverhaul gasket set for five-speed CB450K engines only. Check its coverage against the engine joints being opened.View part 1968-76 Honda CB450 / CL450 / CB500T Engine Oil Seal Kit Seven-piece engine oil-seal kitSeven oil seals with individual dimensions and Honda references listed. Compare those entries with the seals required for the job.View part Honda CB Cylinder Head Gasket ~ Replaces 12909-428-003 Small cylinder-stud sealSmall seal listed against Honda 12909-283-000 and related references. It is not the large combustion-chamber head gasket.View part

Related parts: Athena engine gasket-set alternative

Compare the two gasket-set choices

One set carries an explicit five-speed restriction; the Athena set lists 1968–1974 CB450K application. That does not establish identical contents. Compare the required engine joints and the supplied pieces before choosing between them, especially when the fitted engine has been changed.

Use seal references as the starting point

The oil-seal kit supplies seven pieces, but the engine job may require only some of them or additional sealing parts. Match each removed seal by reference and the complete listed dimensions. Do not assign a location from diameter alone or treat the kit as a flat-gasket set.

Buying questions

Does an overhaul gasket set include the seven oil seals?

The descriptions do not establish that either gasket set contains the separate seven-piece oil-seal kit. Check the contents needed for your job before ordering. Choose seals by their listed references and sizes rather than assuming an overhaul name means every sealing part is supplied.

What is the small cylinder-stud gasket used for?

It is the small 12909-series stud seal, a different component from the main gasket surrounding the combustion chambers. Compare the removed seal and reference. Its listing title alone should not be used to select a complete cylinder-head gasket.

What should I check if the fitted engine differs from the bike year?

Identify the actual engine and the parts being removed before ordering. The five-speed condition on the restricted gasket set still applies, and the required gasket shapes and seal references must match the fitted engine. A frame year does not replace those checks.

Not sure which part you need?

Send your model and year, plus photos of your existing part and any changes to the original setup.

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