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1971 Honda CB450K Engine Seals by Reference & Coverage

Identify which engine sealing components your 1971 Honda CB450K needs before comparing packages. The overhaul sets, seven-seal kit and small cylinder-stud gasket describe different parts. Match the engine and removed components, then confirm coverage rather than relying on a general gasket name.

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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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1971 Honda CB450K · Gaskets & Oil Seals & Engine Hardware Buying guide

Use the reference and sealing position together

The oil-seal kit gives seven reference and dimension entries. The small 12909-series item is a cylinder-stud seal, separate from the main combustion head gasket. Overhaul-set contents still need comparison with the specific engine work.

Parts to consider

Honda CB Athena Overhaul Gasket Set Athena engine overhaul gasket setAthena gasket set with listed 1968–1974 CB450K application. Confirm the supplied gasket coverage against the joints involved in the work.View part Honda CB Cylinder Head Gasket ~ Replaces 12909-428-003 Small cylinder-stud sealSmall stud gasket/seal listing Honda 12909-283-000 and related references. Identify that component separately from the main combustion head gasket.View part 1968-76 Honda CB450 / CL450 / CB500T Engine Oil Seal Kit Seven seals with reference and size entriesSeven-piece engine oil-seal kit. Match each needed reference and its complete dimension entry; seal locations are not mapped in the description.View part

Related parts: Overhaul set restricted to five-speed engines

Make coverage the deciding comparison

The two overhaul-set descriptions do not provide identical itemized contents. Compare the gasket shapes and joints required for the job, keeping the five-speed engine condition with the restricted set. Confirm any inclusion of separate oil seals or the small stud seal rather than assuming a shared overhaul name proves it.

Keep unusual size entries with their references

The oil-seal list includes a four-number size entry. Retain all those numbers with the stated Honda reference and confirm the specification if it is unclear for the removed seal. Do not reduce it to a guessed standard size or assign an engine location from the dimensions alone.

Buying questions

What if the small seal’s shape does not resemble a main head gasket?

The 12909-series item is the small cylinder-stud seal. The main gasket around the combustion chambers is a separate component. Compare the required reference and physical part instead of treating broad head-gasket wording as confirmation of the larger gasket’s function or coverage.

How should I check the seven-piece kit against only a few required seals?

Compare the required references and complete dimension entries with the seven listed seals. The package count establishes supplied pieces, not the location of every seal or a requirement to replace all seven. Confirm any unclear size before selecting by measurement alone.

How do the two overhaul gasket-set listings differ?

The Athena set lists 1968–1974 CB450K application; the other set explicitly requires a five-speed CB450K engine. Neither gives a complete gasket inventory. Compare the fitted engine, gasket shapes and required coverage before choosing the set.

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