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1975 Honda CB400F Engine Seals and Head Gasket

A seal kit, an overhaul set, and a single head gasket solve different leaks. Cover bolts are hardware, not gaskets. Match the part you removed.

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Currently viewing Gaskets & Oil Seals & Engine Hardware

Honda motorcycle parts

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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 CB400 CB350 shift shaft seal 14 x 28 x 7 91206-286-013

Honda CB Shift Shaft Seal ~ 14 x 28 x 7 ~ Replaces 91206-286-013

$4.61 USD
73-0959
Replace your shift shaft seal with this Shift Shaft Seal, 14 x 28 x 7, replacing OEM #91206-286-013. High-quality, made in Japan.Key Features• Shift...
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...
New
Honda CB750 CB400 clutch release actuator assembly

Honda CB750 / CB400 Clutch Release Actuator Assembly

$69.95 USD
99-4848
Restore your clutch system with this complete Clutch Release Actuator Assembly — a high-quality replacement that includes components to restore smooth clutch engagement. This...
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 CB750 CB400 clutch ball retainer 22860-300-006

Honda CB750 / CB400 Clutch Ball Retainer ~ Replaces 22860-300-006

$20.95 USD
99-4849
Ensure smooth and consistent clutch engagement on your vintage Honda with this Clutch Ball Retainer — a quality replacement for OEM #22860‑300‑006. This essential...
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...
New
Honda CB350F CB400F engine oil seal kit with 9 engine seals

1972-77 Honda CB350F / CB400F Engine Oil Seal Kit

$22.66 USD
01-9000
Rebuild your small-bore Honda Supersport right with this 9-piece Engine Oil Seal Kit. Covers every major oil seal on the CB350F and CB400F in...
Honda CB500 CB450 CB400 CB360 CB350 cylinder head gasket 12909-428-003

Honda CB Cylinder Head Gasket ~ Replaces 12909-428-003

$2.95 USD
73-1186
Restore top-end sealing performance with this high-quality Cylinder Head Gasket. Designed to match OEM specifications, this gasket ensures a perfect fit and proper sealing...
Honda CB400F overhaul gasket set

1975-77 Honda CB400F Overhaul Gasket Set

$109.95 USD
18-0437
Rebuild your CB400F Supersport engine with this Overhaul Engine Gasket Set.Key Features• Overhaul engine gasket setFitment / Compatibility• Honda CB400F (1975‑77) SupersportPart Number: 18-0437
Honda CB400F Athena overhaul gasket set

1975-77 Honda CB400F Athena Overhaul Gasket Set

$169.95 USD
18-0190
Rebuild your CB400F Supersport engine with this Athena Overhaul Engine Gasket Set. Athena of Italy is an original-equipment supplier to Yamaha, Honda, Kawasaki, Suzuki,...
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1975 Honda CB400F · Gaskets, Oil Seals & Engine Hardware Buying guide

Know which seals are in the kit

The nine-piece kit names each seal. The overhaul sets do not. The head gasket is one piece with three Honda numbers and a long fitment list.

Parts to consider

1972-77 Honda CB350F / CB400F Engine Oil Seal Kit Nine-piece oil-seal kitTwo crankshaft seals, tachometer seal, CB400F clutch-cover seal, countershaft seal, right crankcase cover seal, gear-shift seal, main-shaft seal, and clutch-lever seal.View part Honda CB Cylinder Head Gasket ~ Replaces 12909-428-003 Head gasketOne gasket replacing 12909-428-003, 12909-283-000, and 12909-333-000. Fitment includes the 1975-77 CB400F and several twins. Match the number on the old gasket.View part Honda CB Shift Shaft Seal ~ 14 x 28 x 7 ~ Replaces 91206-286-013 Shift-shaft seal, 14 x 28 x 7Replaces 91206-286-013. Names the 1975-77 CB400F and other Hondas. The text does not say how many this bike uses.View part

Related parts: Crank seal 30 x 42 x 8 · Tappet O-rings, set of 8 · Points cover gasket

A separate crank seal is not automatically in the kit

The kit names two crankshaft seals and does not give their sizes. The separate crank seal is 30 x 42 x 8, replaces 91201-300-003, and says some models use two different crank seals. Do not assume this size is both of the kit's crank seals, or that this Supersport uses two, unless you are matching the seal you removed.

Cover hardware is not a gasket

The 30-piece set is 27 stainless bolts and 3 Allen keys for the 1975-77 CB400F. A 34-piece set covers side-cover, alternator, points, and tach screws for the CB350F and CB400F. Neither set is a seal.

Gasket and seal questions

Does the overhaul set include the head gasket?

The description does not say. It names the 1975-77 CB400F and does not list the gaskets. Buy the head gasket by 12909-428-003 if that is the piece you need.

What size is the shift seal?

14 x 28 x 7, replacing 91206-286-013. It names the 1975-77 CB400F. Quantity is not printed.

How many tappet O-rings are in the set?

Eight, replacing 91302-001-020, and only for stock-type tappet covers. Fitment includes the 1975-77 CB400F.

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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