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1978 Honda CB400A Engine Parts

The 1978 Honda CB400A combines a twin-cylinder engine with Hondamatic drive. Start with the job in hand: oil-filter service, a valve-cover leak or cam-drive work. Match engine identification and the parts actually fitted before choosing deeper rebuild components.

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Honda motorcycle parts

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Honda CB1100 CB1000 CB900 CB750 oil filter washer set 15414-300-000

Honda CB Oil Filter Washer Set ~ Replaces 15414-300-000

$7.95 USD
15-0039
Fit oil filter washers with this Oil Filter Washer 5-pack, replacing OEM #15414-300-000. Used with original-type paper oil filter elements. Exceptionally broad fitment across...
Honda CB1100 CB1000 CB900 CB750 CB450 magnetic oil drain plug

Honda CB Magnetic Oil Drain Plug

$10.95 USD
15-0014
Catch steel debris on oil changes with this Magnetic Oil Drain Plug, 14mm diameter x M1.5, replacing OEM #92800-14000. Fits the CB750A Hondamatic, full...
Honda CB1100 CB1000 CB900 CB750 oil filter washer each 15414-300-000

Honda CB Oil Filter Washer ~ Each ~ Replaces 15414-300-000

$2.95 USD
15-0042
Oil filter washer designed to replace the original Honda component, matching OEM reference 15414-300-000. Used to create a proper seal at the oil filter...
Honda CB750 CB650 CB550 front sprocket lock plate set 23811-292-000

Honda CB Front Sprocket Lock Plate Set ~ Replaces 23811-292-000

$5.95 USD
49-0782
Replace your front sprocket lock plate with this Front Sprocket Lock Plate with 2 lock plate bolts. Always good to replace these when installing...
New
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Honda CB1100 CB1000 CB900 CB750 drain plug washer

Honda CB1100/CB1000/CB900/CB750 Drain Plug Washer

$1.75 USD
15-0000
Replace your oil drain plug washer with this 14mm x 20mm x 1mm Drain Plug Washer. Broad fitment across the CB750A Hondamatic, the full...
New
Honda CB750 CB550 CB500 rear shock swingarm bushing 40548-268-000

Honda CB Rear Shock Swingarm Bushing ~ Replaces 40548-268-000

$6.20 USD
28-6918
Rear shock swingarm bushing designed to replace the original Honda component, matching OEM reference 40548-268-000. Fits between the shock and swingarm to provide proper...
Honda CB750 CB650 CB550 tappet adjuster screw and nut set 90012-426-000

Honda CB Tappet Adjuster Screw & Nut Set ~ Replaces 90012-426-000

$4.61 USD
49-0784
Replace your tappet adjuster screws and nuts with this Tappet Adjuster Screw & Nut Set. Each set includes one tappet adjuster screw and one...
Honda CB450 CB400 oil filter 15412-413-005

1978-86 Honda CB450 / CB400 Oil Filter ~ Replaces 15412-413-005

$8.95 USD
15-0007
Service your CB400 or CB450 with this Stock-Type Oil Filter Element (paper filter), replacing OEM #15412-413-005 / #154A1-413-005 / #154A1-MA6-000.Key Features• Stock-type paper oil...
Honda CB750 CB400 valve stem seal 12209-300-000

Honda CB750 / CB400 Valve Stem Seal

$3.50 USD
01-0131
Rebuild your CB750 top end the right way with this Valve Stem Seal, replacing OEM Ref. #12209-300-000 / #12209-300-003 / #12209-300-005 / #12209-300-010. Fits...
Honda CB750 CB450 CB400 CB360 CB77 valve guide clip 12211-250-310

Honda CB Valve Guide Clip ~ Replaces 12211-250-310

$1.95 USD
73-0939
Replace your valve guide clip with this Valve Guide Clip, replacing OEM #12211-250-310.Sold each, order the quantity you require.Key Features• Valve guide clip• Replaces...
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Honda CB400 Athena overhaul gasket set

1978-81 Honda CB400 Athena Overhaul Gasket Set

$119.95 USD
18-0103
Rebuild your CB400 engine with this Athena Overhaul Engine Gasket Set. Athena of Italy is an original-equipment supplier to Yamaha, Honda, Kawasaki, Suzuki, and...
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Honda CB450 CB400 valve cover gasket 12328-413-830

1978-86 Honda CB450 / CB400 Valve Cover Gasket ~ Replaces 12328-413-830

$31.95 USD
12-1014
Replace your CB400 or CB450 valve cover gasket with this Athena Brand Valve Cover Gasket, replacing OEM #12328-413-830. Fits the full CB400A/TI/TII/T range plus...
Honda CB400 cam chain tensioner 14500-413-000

Honda CB400 Cam Chain Tensioner ~ Replaces 14500-413-000

$34.95 USD
07-0193
Replace a worn cam chain tensioner on your CB400 with this Cam Chain Tensioner, replacing OEM #14500-413-000. Fits the CB400A, CB400TI, CB400TII, and CB400T,...
Honda CB400 CB450 silent cam chain a 412H x 110 14401-MR4-901

Honda CB400 / CB450 Silent Cam Chain A 412H x 110

$89.95 USD
01-0206
Keep your CB400 or CB450 running quiet and in spec with this Silent Cam Chain A, 412H x 110 links. High-quality construction made in...
Honda CB400A valve stem seal 12209-413-003

1978 Honda CB400A Valve Stem Seal

$2.31 USD
01-0127
Valve Stem Seal ~ Replaces Honda OEM 12209-413-003 for the Honda CB models listed below. Use this part for repair, restoration, or replacement work...
New
Honda CB450 CB400 CB360 CB350 drive chain adjuster with nut and bolt 40543-471-000

Honda CB Drive Chain Adjuster with Nut & Bolt ~ Replaces 40543-471-000 / 40543-312-010

$24.95 USD
99-4856
Upgrade or restore your classic Honda motorcycle’s rear drive system with this Drive Chain Adjuster with Nut and Bolt — a quality replacement designed...
Honda CB450 CB400 oil filter bolt 15420-413-000

1978-86 Honda CB450 / CB400 Oil Filter Bolt ~ Replaces 15420-413-000

$28.95 USD
15-3021
Fit the CB400 or CB450 oil filter bolt with this Oil Filter Bolt, replacing OEM #15420-413-000.Key Features• Oil filter bolt• Replaces OEM #15420-413-000• Honda...
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1978 Honda CB400A · Engine & Drive Hardware Buying guide

Plan the repair around the Hondamatic engine

Routine service parts and internal engine parts need different checks. The CB400A uses a torque converter and a rider-shifted two-speed gearbox, so manual-Hawk transmission assumptions can lead to the wrong order.

Parts to consider

1978-86 Honda CB450 / CB400 Oil Filter ~ Replaces 15412-413-005 Paper oil filter elementStock-type paper element for the 1978 CB400A, replacing reference 15412-413-005.View part 1978-86 Honda CB450 / CB400 Valve Cover Gasket ~ Replaces 12328-413-830 Athena valve-cover gasketSeparate valve-cover gasket for the CB400A. Replaces reference 12328-413-830.View part Honda CB400 Cam Chain Tensioner ~ Replaces 14500-413-000 Cam-chain tensionerReplacement tensioner for the 1978 CB400A, reference 14500-413-000.View part

Start with the service boundary

A paper filter element and a separate valve-cover gasket suit different maintenance jobs. Choose only the components needed for the work you have planned, then check any disturbed seals and retaining hardware against the CB400A manual before dismantling further.

Keep the two drive systems distinct

The internal cam chain operates the engine’s valve timing. The external final drive uses its own sprocket retaining plate and rear-wheel adjusters. Diagnose which assembly needs attention before ordering; matching a broad engine-category label is not enough to identify the part.

Engine & Drive Hardware questions

Can I use a manual CB400 Hawk parts list for the Hondamatic?

Use the CB400A application for engine and transmission work. Some service parts are shared, but the torque-converter transmission requires its own checks; a manual-model kit is not automatically suitable.

Does the oil filter include the housing bolt?

The paper element and oil-filter bolt are separate products here. Inspect the housing hardware and choose the bolt only if it needs replacement; do not assume it comes with the element.

Should I buy an overhaul set for a valve-cover leak?

The separate Athena valve-cover gasket targets that joint. An overhaul assortment may be unnecessary for a cover-only repair; identify the leaking joint and the work required before expanding the order.

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