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1975 Honda CB550K Engine Gaskets, Oil Seals & Hardware

Sealing parts for the 1975 Honda CB550K engine range from complete Athena and standard overhaul sets down to single items: the head, base, cover and alternator gaskets, a nine-seal kit, crank, kickstart and tach drive seals, sleeve and tappet O-rings and head nut covers.

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Currently viewing Gaskets & Oil Seals & Engine Hardware

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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...
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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1975 Honda CB550K · Gaskets & Seals Buying guide

Stopping oil leaks

Clean the outside of the engine and identify the joint or shaft where fresh oil appears. That helps distinguish a cover-gasket repair from a shaft-seal replacement and keeps the order focused on the actual leak.

Parts to consider

1974-78 Honda CB550F / CB550K Overhaul Gasket Set Overhaul gasket setOverhaul engine gasket set listed for 1974-78 CB550K bikes; compare its contents with the planned repair.View part 1971-78 Honda CB550F / CB550K / CB500K Cylinder Head Gasket ~ Replaces 12251-374-306 Cylinder head gasketHead gasket standing in for Honda 12251-374-306; covers CB550K bikes from 1974 to 1978.View part Honda CB550 Engine Oil Seal Kit Engine oil seal kitClutch lever, gearshift drum and spindle, crankshaft and side cover seals in one kit.View part

Related parts: Japanese crankshaft seal · Cylinder head cover gasket · Alternator cover gasket

Check the crank seal size

The separately sold crankshaft seal stands in for Honda 91201-300-003 and is made in Japan. Its description cautions that certain engines carry a pair of different crank seals, so read the dimensions off your old seal and match them before ordering.

Compare individual shaft seals

The separate kickstart seal references Honda 91204-286-003, while the tach-drive seal references 91256-096-651. Both listings name the 1974-78 CB550K and state Japanese manufacture. Match the seal position and listed dimensions to the removed part before ordering either one.

Gasket and seal FAQs

What does the engine oil seal kit include?

Nine seals, among them the clutch lever, gearshift drum, gearshift spindle, right crankcase cover and crankshaft seals. Its fitment covers 1974-78 CB550K bikes and the CB550F Supersport.

Is the base gasket shared with other models?

Yes. The base gasket stands in for Honda 12191-426-306 and fits the CB650 range as well as 1974-78 CB550K bikes and the CB500K, according to its listing.

How are the tappet cover O-rings sold?

In sets of eight, standing in for Honda 91302-001-020. The listing notes they only suit OEM-type tappet covers, so check yours if aftermarket caps have been fitted.

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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