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1980 Honda CB650C Custom Engine Gaskets & Seals

Before ordering sealing parts for the 1980 CB650C, locate the leak and identify the joint being opened. A cylinder-cover gasket, shaft oil seal and overhaul gasket set are separate choices. Matching the repair keeps a small cover job from becoming an unnecessary full kit.

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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 CB1100 CB1000 shift shaft oil seal 12.5 x 25 x 8 91204-425-003

Honda CB Shift Shaft Oil Seal ~ 12.5 x 25 x 8 ~ Replaces 91204-425-003

$4.61 USD
73-0968
Replace your shift shaft oil seal with this Shift Shaft Oil Seal, 12.5 x 25 x 8, replacing OEM #91204-425-003. High-quality, made in Japan.Key...
Honda CB1100 CB1000 tach drive oil seal 4.8 x 14.5 x 5 91256-425-003

Honda CB Tach Drive Oil Seal ~ 4.8 x 14.5 x 5 ~ Replaces 91256-425-003

$4.95 USD
73-0964
Replace your tach drive oil seal with this Tach Drive Oil Seal, 4.8 x 14.5 x 5, replacing OEM #91256-425-003. High-quality, made in Japan.Key...
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...
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Honda CB750 CB900 CB650 cam cover seal 90541-425-000

Honda CB750 / CB900 / CB650 Cam Cover Seal

$11.95 USD
01-0116
Keep oil where it belongs with this Cam Cover Seal, a direct replacement for OEM #90541-425-000. Fits a wide range of late-'70s through early-'80s...
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Honda CB650 CB650C CB650SC valve cover gasket 12391-460-770

1979-82 Honda CB650 / CB650C / CB650SC Valve Cover Gasket ~ Replaces 12391-460-770

$23.05 USD
18-6995
Replace your CB650 valve cover gasket with this Valve Cover Gasket (cylinder cover), replacing OEM #12391-460-770.Key Features• Valve cover (cylinder cover) gasket• Replaces OEM...
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...
Honda CB650 CB650C CB650SC alternator cover gasket 11691-426-306

1979-82 Honda CB650 / CB650C / CB650SC Alternator Cover Gasket ~ Replaces 11691-426-306

$11.05 USD
18-6994
Replace your CB650 alternator cover gasket with this Alternator Cover Gasket, replacing OEM #11691-426-306.Key Features• Alternator cover gasket• Replaces OEM #11691-426-306• Honda part name:...
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 CB650 engine oil seal kit made in japan

1980-82 Honda CB650 Engine Oil Seal Kit

$34.95 USD
01-9003
Rebuild your CB650 with this 7-piece Engine Oil Seal Kit, built to superior OEM quality and made in Japan. A complete seal bundle for...
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Honda CB650 CB650C CB650SC cylinder head gasket 12251-426-306

1979-82 Honda CB650 / CB650C / CB650SC Cylinder Head Gasket ~ Replaces 12251-426-306

$59.95 USD
18-6992
Replace your CB650 cylinder head gasket with this Cylinder Head Gasket, replacing OEM #12251-426-306.Key Features• Cylinder head gasket• Replaces OEM #12251-426-306• Honda part name:...
Honda CB650 CB650C CB650SC overhaul gasket set

1979-82 Honda CB650 / CB650C / CB650SC Overhaul Gasket Set

$139.95 USD
18-0440
Rebuild your CB650 engine with this Overhaul Engine Gasket Set.Key Features• Overhaul engine gasket setFitment / Compatibility• Honda CB650 (1979‑82)• CB650C (1980‑81) Custom• CB650SC...
Honda CB650 CB650C CB650SC Athena overhaul gasket set

1979-82 Honda CB650 / CB650C / CB650SC Athena Overhaul Gasket Set

$179.95 USD
18-0202
Rebuild your CB650 engine with this Athena Overhaul Engine Gasket Set. Athena of Italy is an original-equipment supplier to Yamaha, Honda, Kawasaki, Suzuki, and...
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...
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Honda CB650 CB650C CB650SC Athena gasket set (top end set only)

1979-82 Honda CB650 / CB650C / CB650SC Athena Gasket Set (Top End Set Only)

$149.95 USD
18-0434
Freshen up the top end of your CB650 with this Athena Top End Gasket Set. Athena of Italy is an original-equipment supplier to Yamaha,...
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1980 Honda CB650C Custom · Engine Gaskets & Seals Buying guide

Choose the gasket for the joint being opened

The dedicated valve cover gasket is a focused repair option. The seven-piece oil seal kit covers a different type of sealing work, so compare the kit with the dismantled engine before adding individual seals.

Parts to consider

1979-82 Honda CB650 / CB650C / CB650SC Valve Cover Gasket ~ Replaces 12391-460-770 Valve cover gasketCylinder-cover gasket for the CB650 engine; replaces Honda reference 12391-460-770.View part 1980-82 Honda CB650 Engine Oil Seal Kit Seven-piece oil seal kitSeven engine oil seals for the 1980–82 CB650 family, including the Custom application.View part

Gaskets and oil seals do different jobs

Flat cover gaskets and shaft seals are not interchangeable. The CB650C valve cover gasket uses reference 12391-460-770, while the separate shift-shaft seal is listed at 12.5 × 25 × 8. Identify the actual source of the leak before choosing either type.

Compare packages before adding extras

The oil seal kit contains seven pieces. The overhaul and top-end gasket products have broader names without a full written list of contents, so do not assume they include every seal or small rubber needed for your particular teardown.

Engine Gaskets & Seals questions

Is the seven-piece seal kit a gasket set?

No. It is sold as an engine oil seal kit. Cover, cylinder-head and cylinder-base gaskets are separate product types; choose them according to the joints opened during the repair.

Can I select a crank seal from the model name alone?

Match its position, reference and dimensions. The separate crank-seal listing specifies 30 × 42 × 8 and warns that some engines use different crank seals; compare the removed part.

What if I only need the valve cover gasket?

The dedicated cylinder-cover gasket is available separately. Use that repair scope to decide whether a broader package is useful rather than assuming an overhaul set is needed for one cover.

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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