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1977 Honda CB550K Engine Gaskets, Seals & Hardware

Engine gasket choices for the 1977 Honda CB550K range from individual base and head-cover gaskets to an Athena top-end set. Name the joint being repaired first, then compare its gasket outline and listing reference with the removed component and planned work.

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Currently viewing Gaskets & Oil Seals & Engine Hardware

Honda motorcycle parts

Choose your model and year to see parts listed for your bike.

Honda CB750 CB550 CB500 CB400 CB350 point plate gasket 30372-300-300

Honda CB Point Plate Gasket ~ Replaces 30372-300-300

$7.50 USD
18-7010
Replace your Contact Point Plate Cover Gasket with this Point Plate Gasket, replacing OEM #30372-300-300. Broad fitment across the SOHC CB750, CB500K/CB550 family, and...
Honda CB750 CB550 CB500 CB350 tach drive oil seal 4.8 x 14.5 x 4 91256-096-651

Honda CB750 / CB550 / CB500 / CB350 Tach Drive Oil Seal ~ 4.8 x 14.5 x 4 ~ Replaces 91256-096-651

$4.95 USD
73-0963
Replace your tach drive oil seal with this Tach Drive Oil Seal, 4.8 x 14.5 x 4, replacing OEM #91256-096-651. High-quality, made in Japan.Key...
Honda CB750 CB550 valve tappet cover gasket (set 8) 91302-001-020

Honda CB Valve Tappet Cover O-Ring (Set/8) ~ Replaces 91302-001-020

$15.95 USD
18-7069
Replace your valve tappet cover O-rings with this Valve Tappet Cover O-Ring Set of 8, replacing OEM #91302-001-020. Designed for stock-type valve tappet covers...
Honda CB750 CB550 CB650 cylinder head nut cover 91318-300-013

Honda CB750 / CB550 / CB650 Cylinder Head Nut Cover

$3.74 USD
01-0137
Restore the clean look of your cylinder head with this Rubber Cylinder Head Nut Cover, a replacement for OEM Ref. #91318-300-013. Fits all 1969-78...
Honda CB750 CB550 CB500 CB350 kickstart oil seal 18 x 29 x 7 91204-286-003

Honda CB750 / CB550 / CB500 / CB350 Kickstart Oil Seal ~ 18 x 29 x 7 ~ Replaces 91204-286-003

$4.95 USD
73-0962
Replace your kickstart oil seal with this Kickstart Oil Seal, 18 x 29 x 7, replacing OEM #91204-286-003. High-quality, made in Japan.Key Features• Kickstart...
New
Honda CB550 CB500 CB400 CB350 engine primary drive rubber set 8 23114-323-000

Honda CB550 / CB500 / CB400 / CB350 Engine Primary Drive Rubber Set/8 ~ Replaces 23114-323-000

$32.95 USD
28-6922
Restore smooth power transfer inside the engine with this Engine Primary Drive Rubber Set (Set of 8), designed to replace worn or deteriorated original...
New
Honda CB550 engine oil seal kit with clutch crankshaft countershaft and tach seals

Honda CB550 Engine Oil Seal Kit

$28.95 USD
01-0149
Tackle your CB550 engine rebuild with confidence using this 9-piece Engine Oil Seal Kit. Covers every major oil seal your mid-'70s CB550 needs in...
Honda CB550F CB550K overhaul gasket set

1974-78 Honda CB550F / CB550K Overhaul Gasket Set

$124.95 USD
18-0439
Rebuild your CB550 engine with this Overhaul Engine Gasket Set.Key Features• Overhaul engine gasket setFitment / Compatibility• Honda CB550K (1974‑78)• CB550F (1975‑77) SupersportPart Number:...
Honda CB750 CB650 cylinder sleeve o-ring gasket set 91304-286-000

Honda CB Cylinder Sleeve O-Ring Gasket Set ~ Replaces 91304-286-000

$4.50 USD
18-7068
Replace your cylinder sleeve O-rings with this Cylinder Sleeve O-Ring Set of 4, replacing OEM #91304-286-000.Key Features• Cylinder sleeve O-rings, 4 per set• Replaces...
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Honda CB550F CB550K CB500K alternator cover gasket 11691-323-306

1971-78 Honda CB550F / CB550K / CB500K Alternator Cover Gasket ~ Replaces 11691-323-306

$9.86 USD
18-6999
Replace your CB500K or CB550 alternator cover gasket with this Alternator Cover Gasket, replacing OEM #11691-323-306.Key Features• Alternator cover gasket• Replaces OEM #11691-323-306• Honda...
Honda CB750 CB650 CB550 CB500 crank seal 30 x 42 x 8 91201-300-003

Honda CB Crank Seal ~ 30 x 42 x 8 ~ Replaces 91201-300-003

$7.00 USD
73-0960
Replace your crank seal with this Crank Seal, 30 x 42 x 8, replacing OEM #91201-300-003. High-quality, made in Japan.Note: please reference the OEM...
Honda CB550F CB550K CB500K cylinder head gasket 12251-374-306

1971-78 Honda CB550F / CB550K / CB500K Cylinder Head Gasket ~ Replaces 12251-374-306

$69.95 USD
18-6996
Replace your CB500K or CB550 cylinder head gasket with this Cylinder Head Gasket, replacing OEM #12251-374-306.Key Features• Cylinder head gasket• Replaces OEM #12251-374-306• Honda...
1976-78 Honda CB550K / CB550F Cylinder Base Gasket ~ Replaces Honda OEM 11394-390-306

1976-78 Honda CB550K / CB550F Cylinder Base Gasket ~ Replaces Honda OEM 11394-390-306

$17.41 USD
18-6998
Honda CB550F CB550K Clutch Cover Gasket - Replaces Honda OEM 11394-390-306. This clutch cover gasket seals the clutch cover to the engine side cover...
Honda CB550F CB550K CB500K cylinder head cover gasket 12391-323-000

1971-78 Honda CB550F / CB550K / CB500K Cylinder Head Cover Gasket ~ Replaces 12391-323-000

$41.95 USD
18-6997
Replace your CB500K or CB550 cylinder head cover gasket with this Cylinder Head Cover Gasket, replacing OEM #12391-323-000.Key Features• Cylinder head cover gasket• Replaces...
Honda CB650 CB550 CB500 cylinder base gasket 12191-426-306

Honda CB650 / CB550 / CB500 Cylinder Base Gasket ~ Replaces 12191-426-306

$18.50 USD
18-6993
Replace your CB650 or CB500/CB550 cylinder base gasket with this Cylinder Base Gasket, replacing OEM #12191-426-306.Key Features• Cylinder base gasket• Replaces OEM #12191-426-306• Honda...
Honda CB550F CB550K Athena overhaul gasket set

1974-78 Honda CB550F / CB550K Athena Overhaul Gasket Set

$179.95 USD
18-0198
Rebuild your CB550 engine with this Athena Overhaul Engine Gasket Set. Athena of Italy is an original-equipment supplier to Yamaha, Honda, Kawasaki, Suzuki, and...
Honda CB550F CB550K CB500K Athena gasket set (top end set only)

1971-78 Honda CB550F / CB550K / CB500K Athena Gasket Set (Top End Set Only)

$144.95 USD
18-0435
Freshen up the top end of your CB500 or CB550 with this Athena Top End Gasket Set. Athena of Italy is an original-equipment supplier...
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1977 Honda CB550K · Gaskets & Oil Seals & Engine Hardware Buying guide

Make the gasket list by engine joint

An individual gasket suits a named joint; the top-end set is another buying option with contents shown in its photo. Oil seals and other hardware need their own contents checks before being added.

Parts to consider

Honda CB650 / CB550 / CB500 Cylinder Base Gasket ~ Replaces 12191-426-306 Cylinder-base gasketReplacement gasket referencing Honda 12191-426-306, with CB550K listed in its description.View part 1971-78 Honda CB550F / CB550K / CB500K Cylinder Head Cover Gasket ~ Replaces 12391-323-000 Cylinder-head cover gasketSeparate head-cover gasket referencing Honda 12391-323-000.View part 1971-78 Honda CB550F / CB550K / CB500K Athena Gasket Set (Top End Set Only) Athena top-end setTop-end gasket package whose supplied contents are identified by the listing photo.View part

Related parts: Separate engine oil-seal kit

Compare the named joint rather than a broad title

A cylinder-base gasket and cylinder-head cover gasket have different descriptions and references. Compare the removed outline with the appropriate listing. If you are uncertain about the joint name, provide a photo and engine details before selecting a gasket from a broad engine category.

Get clarification when the part names disagree

Another listing has a cylinder-base title but describes a clutch-cover gasket with reference 11394-390-306. Confirm that item before ordering it for either joint. The featured base gasket instead has a consistent base-gasket description and reference 12191-426-306, allowing a clearer comparison with the required part.

Common ordering questions

How are top-end set contents identified?

The Athena top-end listing says the contents are shown in its photo. Compare that image with the gaskets needed for the job, and confirm any uncertain piece before deciding which individual gaskets to add.

Is a head-cover gasket the same as a head gasket?

The head-cover gasket references 12391-323-000; the separately listed cylinder-head gasket references 12251-374-306. Match the engine joint and removed gasket shape with the corresponding product description before selecting a replacement.

What if the title names the wrong gasket joint?

Use the description, reference and removed-part photo to raise the question before buying. The conflicting cylinder-base versus clutch-cover listing needs clarification; a matching motorcycle application does not resolve that disagreement about the actual part.

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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Parts categories for 1977 Honda CB550K

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