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1978 Honda CB750A Hondamatic Gaskets & Engine Seals

Gasket shape and joint location matter more than a familiar CB750 name. For the 1978 Honda CB750A, this category includes three explicitly described Hondamatic case gaskets as well as individual engine gaskets and broader sets. Start with the sealing joint being repaired.

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Currently viewing Gaskets & Oil Seals & Engine Hardware

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Honda CB750 alternator cover gasket (dyno cover) 11397-300-306

1969-78 Honda CB750 Alternator Cover Gasket (Dyno Cover) ~ Replaces 11397-300-306

$14.95 USD
12-5038
Replace the SOHC CB750 alternator (dyno) cover gasket with this Alternator Cover Gasket (Dyno Cover), replacing OEM #11397-300-306. Fits all 1969-1978 CB750 models.Key Features•...
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 clutch cover gasket 11396-300-303

1969-78 Honda CB750 Clutch Cover Gasket ~ Replaces 11396-300-303

$13.95 USD
12-5037
Rebuild your SOHC CB750's clutch cover with this Clutch Cover Gasket, replacing OEM #11396-300-303 / #11396-399-396 / #11396-399-060. Fits all 1969-78 CB750 models.Key Features•...
Honda CB750 cam valve cover gasket 12391-300-306

1969-78 Honda CB750 Cam / Valve Cover Gasket ~ Replaces 12391-300-306

$22.95 USD
18-7003
Replace your SOHC CB750's cam/valve cover gasket with this Cam / Valve Cover Gasket, replacing OEM #12391-300-306.Key Features• Cam / valve cover gasket• Replaces...
Honda CB750 cam chain tensioner gasket 14592-300-396

1969-78 Honda CB750 Cam Chain Tensioner Gasket ~ Replaces 14592-300-396

$3.50 USD
18-7009
Replace your SOHC CB750 cam chain tensioner gasket with this Cam Chain Tensioner Gasket, replacing OEM #14592-300-396.Key Features• Cam chain tensioner gasket• Replaces OEM...
Honda CB1100 CB1000 CB900 CB750 oil pan gasket 11398-425-306

Honda CB1100 / CB1000 / CB900 / CB750 Oil Pan Gasket ~ Replaces 11398-425-306

$15.94 USD
18-7053
Replace your DOHC CB's oil pan gasket with this Oil Pan Gasket, replacing OEM #11398-425-306. Broad fitment across the CB750A Hondamatic, full 1979-82 CB750...
Honda CB1100 CB1000 CB900 exhaust headpipe gasket (each) 18291-MM5-860

Honda CB Exhaust Headpipe Gasket (Each) ~ Replaces 18291-MM5-860

$6.84 USD
18-7013
Replace one cylinder-head-to-exhaust-headpipe gasket on your big-bore Honda with this Cylinder Head to Exhaust Headpipe Gasket, 1 piece, replacing OEM #18291-MM5-860. Exceptionally broad fitment...
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...
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Honda CB750 SOHC Athena engine gasket set

1969-78 Honda CB750 SOHC Athena Engine Gasket Set

$179.95 USD
18-0110
Rebuild your SOHC CB750 engine with this Athena Overhaul Gasket Set. Athena of Italy is an original-equipment supplier to Yamaha, Honda, Kawasaki, Suzuki, and...
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...
Honda CB750 starter motor cover gasket 31282-300-020

1969-78 Honda CB750 Starter Motor Cover Gasket ~ Replaces 31282-300-020

$5.80 USD
18-7011
Replace your SOHC CB750 starter motor cover gasket with this Starter Motor Rubber Cover Gasket, replacing OEM #31282-300-020.Key Features• Starter motor rubber cover gasket•...
Honda CB750A CB750F CB750K Athena gasket set (top end set only) 12191-300-030

1974-78 Honda CB750A / CB750F / CB750K Athena Gasket Set (Top End Set Only) ~ Replaces 12191-300-030

$134.95 USD
18-0431
Freshen up the top end of your SOHC CB750 with this Athena Top End Gasket Set. Athena of Italy is an original-equipment supplier to...
Honda CB750 cam cover breather gasket 12329-300-020

1969-78 Honda CB750 Cam Cover Breather Gasket ~ Replaces 12329-300-020

$9.50 USD
18-7014
Replace your SOHC CB750 cam cover breather gasket with this Cam Cover Breather Gasket (O-ring), replacing OEM #12329-300-020.Key Features• Cam cover breather gasket (O-ring)•...
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Honda CB750 cylinder base gasket 12191-300-306

1969-78 Honda CB750 Cylinder Base Gasket ~ Replaces 12191-300-306

$16.95 USD
18-7001
Replace your SOHC CB750's cylinder base gasket with this Cylinder Base Gasket, replacing OEM #12191-300-306.Key Features• Cylinder base gasket• Replaces OEM #12191-300-306• Honda part...
Honda CB750A CB750F CB750K cylinder stud packing set (8PC) 12115-300-000

1972-78 Honda CB750A / CB750F / CB750K Cylinder Stud Packing Set (8pc) ~ Replaces 12115-300-000

$18.76 USD
18-7018
Replace your cylinder head bolt stud packings with this 8-piece Cylinder Stud Packing Set (short tubular rubber seals that fit over dowels), replacing 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 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 CB750 starting clutch gear seal 25 x 33 x 4 91215-300-003

1969-78 Honda CB750 Starting Clutch Gear Seal ~ 25 x 33 x 4 ~ Replaces 91215-300-003

$5.80 USD
73-0961
Replace your starting clutch gear seal with this Starting Clutch Gear Seal, 25 x 33 x 4, replacing OEM #91215-300-003. High-quality, made in Japan.Key...
Honda CB750 cylinder head gasket 12251-300-050

1969-78 Honda CB750 Cylinder Head Gasket ~ Replaces 12251-300-050

$119.95 USD
18-7002
Replace your SOHC CB750's cylinder head gasket with this Premium Athena Brand Cylinder Head Gasket, replacing OEM #12251-300-050.Key Features• Premium Athena cylinder head gasket•...
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Honda CB750A gear select case gasket 11396-393-306

1976-78 Honda CB750A Gear Select Case Gasket ~ Replaces 11396-393-306

$11.61 USD
18-7021
Replace your CB750A Hondamatic's gear select case gasket with this Gear Select Case Gasket, replacing OEM #11396-393-306.Key Features• Gear select case gasket• Replaces OEM...
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Honda CB750A left crankcase to oil pump gasket 11395-393-306

1976-78 Honda CB750A Left Crankcase to Oil Pump Gasket ~ Replaces 11395-393-306

$7.71 USD
18-7019
Replace your CB750A Hondamatic's left crankcase to oil pump gasket with this Left Crankcase to Oil Pump Gasket, replacing OEM #11395-393-306.Key Features• Left crankcase...
Honda CB750 oil pump gasket 15135-300-010

1969-78 Honda CB750 Oil Pump Gasket ~ Replaces 15135-300-010

$6.60 USD
18-7008
Replace your SOHC CB750 oil pump gasket with this Oil Pump Gasket, replacing OEM #15135-300-010.Key Features• Oil pump gasket• Replaces OEM #15135-300-010• Honda part...
Honda CB750A torque convertor case cap gasket 11391-393-306

1976-78 Honda CB750A Torque Convertor Case Cap Gasket ~ Replaces 11391-393-306

$7.00 USD
18-7020
Replace your CB750A Hondamatic's torque convertor case cap gasket with this Torque Convertor Case Cap Gasket, replacing OEM #11391-393-306.Key Features• Torque convertor case cap...
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1978 Honda CB750A · Gaskets & Oil Seals & Engine Hardware Buying guide

Choose the gasket for the exact Hondamatic joint

List the joints that will be opened before choosing individual gaskets or a top-end assortment. Pay particular attention to similarly named oil-pump gaskets and the quantities itemized inside a larger package.

Parts to consider

1976-78 Honda CB750A Gear Select Case Gasket ~ Replaces 11396-393-306 Hondamatic gear-select case gasketThe product names the gear-select case and replaces reference 11396-393-306. Its fitment description specifically lists the CB750A Hondamatic.View part 1976-78 Honda CB750A Torque Convertor Case Cap Gasket ~ Replaces 11391-393-306 Torque converter case-cap gasketA separate Hondamatic gasket listed against reference 11391-393-306. Compare the cap joint and gasket shape with the fitted assembly.View part 1976-78 Honda CB750A Left Crankcase to Oil Pump Gasket ~ Replaces 11395-393-306 Crankcase-to-oil-pump gasketThe Hondamatic listing identifies this joint and reference 11395-393-306. It is a different listing from the general oil pump gasket; check current availability.View part

Related parts: Separate cam and valve cover gasket · Athena top-end gasket assortment · Separate oil pump gasket

Inspect the fitted covers before selecting seals

Identify the covers and caps intended for reuse, including any non-original replacements. Compare their sealing arrangement with the removed components before choosing a stock-application gasket or O-ring.

Keep the two oil-pump references distinct

The Hondamatic crankcase-to-oil-pump joint uses 11395-393-306; the separate oil pump gasket uses 15135-300-010. Match the actual joint and removed gasket rather than treating those similar product names as interchangeable.

Common questions

Is the crankcase-to-oil-pump gasket the oil pump gasket?

The listings name different joints and give different replacement references. The first specifically describes the Hondamatic crankcase-to-oil-pump connection; the other is titled oil pump gasket. Compare the removed sealing piece with the correct photograph and reference before selecting either.

Can the top-end set be assumed to cover a case repair?

Read its contents rather than assuming coverage from the set name. The top-end assortment lists named head, cylinder and sealing components. Compare the Hondamatic case joint you are repairing with that inventory and the individual case-gasket listing.

Does the top-end assortment promise the same tappet-ring quantity as the loose pack?

The Athena top-end contents list four tappet-cover gaskets under part 18-7069, while the separate 18-7069 listing supplies eight O-rings. Do not assume the kit contains eight from the shared part number. Confirm the kit’s actual supplied quantity when planning all the cap seals.

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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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