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1980 Honda CB650 Engine Gaskets & Seals

For cylinder work on a 1980 CB650, distinguish the head joint, base joint and cylinder-sleeve O-rings before ordering. Individual cover gaskets serve more limited repairs. Identify the exact engine and the parts being removed so similar gasket names do not confuse the order.

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Currently viewing Gaskets & Oil Seals & Engine Hardware

Honda motorcycle parts

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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 CB650 · Engine Gaskets & Seals Buying guide

Choose sealing parts for the joints being disturbed

Head and base gaskets are separate items. The sleeve O-ring set supplies four pieces, while a cover gasket addresses its own perimeter. Match all of them to the actual repair scope.

Parts to consider

1979-82 Honda CB650 / CB650C / CB650SC Cylinder Head Gasket ~ Replaces 12251-426-306 Cylinder-head gasketCB650 head gasket; reference 12251-426-306.View part Honda CB650 / CB550 / CB500 Cylinder Base Gasket ~ Replaces 12191-426-306 Cylinder-base gasketReplacement base gasket; reference 12191-426-306.View part Honda CB Cylinder Sleeve O-Ring Gasket Set ~ Replaces 91304-286-000 Cylinder-sleeve O-ring setFour O-rings, replacing reference 91304-286-000.View part

Related parts: Valve-cover gasket · Alternator-cover gasket

Keep cylinder sealing components distinct

The head gasket replaces 12251-426-306 and the base gasket replaces 12191-426-306. The four sleeve O-rings have reference 91304-286-000. Check the service procedure and the joints being separated before deciding which of these items the repair requires.

Use individual covers for a smaller repair

The linked valve-cover and alternator-cover gaskets provide focused options for their respective covers. Do not select a broad kit merely because oil is visible elsewhere on the engine; locate the source and inspect mating parts before purchasing.

Ordering questions

Does a head gasket include the base gasket?

They are separate products with different sealing locations and references. Order the parts for the actual strip-down rather than treating a cylinder gasket as a complete top-end package.

Do cylinder-sleeve O-rings replace the cylinder-base gasket?

No. The O-rings seal around the lower cylinder sleeves where the block enters the crankcase; the base gasket seals the block-to-crankcase joint. The sleeve set contains four O-rings for this four-cylinder engine. Match both types to the joints involved in the repair.

Can a cover leak be repaired with an individual gasket?

An individual gasket is available for each linked cover. First confirm the leaking joint and condition of its mating surfaces; a gasket listing does not diagnose the cause of the leak.

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

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