VintageCB750 Supplying CB Riders Since 2010

About Us Why Us? Reviews Shipping Info Returns Contact Us
Wish Lists
0 My Cart

Your cart is currently empty.

Browse all parts
Total (USD): $0.00
View cart
Menu
Search
Wish
Cart 0
My motorcycle Choose your Honda CB model

Search parts

Searching all Honda CB parts

Example: brake pads or oil filter.

1978 Honda CB550K Engine Gaskets & Oil Seals

The 1978 Honda CB550K sealing selection offers individual engine gaskets, a top-end gasket set and a separate oil-seal kit. Identify which joint or shaft position is involved before choosing a package, and compare its contents with the pieces already on the repair list.

Close ×
Your saved bike Choose your Honda CB model

Shop By Category

Most orders ship same or next business day Fitment guarantee Listed for your exact model and year? We’ll make it right if it doesn’t fit as described. Mechanic-backed support Ask our team for help choosing the right Honda CB part.
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...
Sold out
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...
compare

1978 Honda CB550K · Gaskets & Oil Seals & Engine Hardware Buying guide

Match the seal to the joint being repaired

A head gasket, head-cover gasket and shaft seal serve different identified positions. The gasket-set photo and oil-seal kit’s named list help compare coverage without treating every sealing product as the same package.

Parts to consider

1971-78 Honda CB550F / CB550K / CB500K Cylinder Head Gasket ~ Replaces 12251-374-306 Cylinder-head gasketHead-joint gasket with replacement reference 12251-374-306 and a stated CB550K application.View part 1971-78 Honda CB550F / CB550K / CB500K Athena Gasket Set (Top End Set Only) Athena top-end gasket setTop-end package whose listing identifies supplied contents through the product photo.View part Honda CB550 Engine Oil Seal Kit Nine named engine oil sealsIncludes clutch, gearshift, crankshaft, countershaft, main-shaft and tach sealing positions.View part

Related parts: Separate cylinder-base gasket · Separate head-cover gasket

Compare the head and cover joints separately

The cylinder-head gasket references 12251-374-306, while the head-cover gasket references 12391-323-000. Compare the joint and removed outline with the appropriate description. When planning a top-end set, examine its photographed contents before adding those individual gaskets to the same repair order.

Pause when the product names disagree

A separate item has a cylinder-base title but describes a clutch-cover gasket with reference 11394-390-306. Those names identify different joints. Seek clarification before choosing that item; use the consistent description and reference of the separately listed base gasket when comparing a cylinder-base requirement.

Common ordering questions

What is stated about the top-end set contents?

The Athena description says the supplied contents are shown in its product photo. Compare that image with the identified joints in the job, and confirm uncertain pieces before relying on a set name to complete the gasket list.

What positions are named in the oil-seal kit?

The nine-piece list names clutch lever, gearshift drum and spindle, right crankcase cover, two crankshaft seals, countershaft, main-shaft flat and tach seal. Compare those positions with the repair requirements instead of substituting the kit for a gasket set.

Should I choose the conflicting gasket by its title?

Clarify it first. The title says cylinder base, but the description identifies a clutch-cover gasket and reference 11394-390-306. The model application does not settle that part-name conflict; provide the required joint and removed-part details before ordering.

Not sure which part you need?

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

Ask a fitment question
Parts categories for 1978 Honda CB550K

Your cart

×