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1978 Honda CB400A Fuel-system Parts

For the 1978 Honda CB400A, separate tank-supply faults from carburetor and intake service. A petcock, manifold O-rings and an air filter work at different points in that system. Identify the fitted tank, carburetors and airbox before choosing replacement parts.

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Honda motorcycle parts

Choose your model and year to see parts listed for your bike.

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Honda CB throttle sleeve 53141-300-010

Honda CB Throttle Sleeve ~ Replaces 53141-300-010

$9.95 USD
02-2462
Refresh the throttle feel on your Honda with this Nylon Throttle Sleeve, a replacement for OEM Ref. #53141-300-010 with exceptionally broad fitment across the...
Honda CB1100 CB1000 CB900 CB750 float bowl gasket

Honda CB1100/CB1000/CB900/CB750 Float Bowl Gasket

$9.50 USD
20-8031
Replace your DOHC CB float bowl gasket with this Float Bowl Gasket (O-ring). Broad fitment across the 1979-82 CB750 family, CB750SC Nighthawk, CB900/CB1000/CB1100, CB650...
Honda CB750 CB550 CB450 CB400 CB350 gas cap rubber seal 17631-329-003

Honda CB Gas Cap Rubber Seal ~ Replaces 17631-329-003

$7.95 USD
20-0097
Replace the broad-fitment gas cap rubber seal on many classic Hondas with this Gas Cap Rubber Seal, replacing OEM #17631-329-003. Exceptionally wide fitment covering...
Honda CB750 CB550 CB400 filler cap 17620-399-010

Honda CB750 / CB550 / CB400 Filler Cap ~ Replaces 17620-399-010

$69.95 USD
73-0079
Replace your gas tank cap with this OEM Style Gas / Fuel Tank Cap with rubber gasket already installed, replacing OEM #17620-399-010.Note: does not...
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Honda CB750 CB650 CB550 CB400 CB125 float needle 16011-382-004

Honda CB Float Needle ~ Replaces 16011-382-004

$8.95 USD
48-5010
Replace your float needle (only) with this Float Needle, replacing OEM #16011-382-004.Key Features• Float needle (only)• Replaces OEM #16011-382-004• Honda part name: Valve Set,...
Honda CB1100 CB1000 CB900 CB750 float bowl drain screw -a

Honda CB Stock Type Float Bowl Drain Screw ~-A

$6.50 USD
48-5042
Small part, but an important one. This float bowl drain screw with included O-ring allows you to properly drain the carburetor bowl without leaks,...
Honda CB1100 CB1000 CB900 CB750 float bowl drain screw

Honda CB Stock Type Float Bowl Drain Screw

$6.50 USD
48-5042
Replace your stock-type float bowl drain screw with this Float Bowl Drain Screw with O-Ring for the later DOHC and Nighthawk lineup.Note: sold each,...
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Honda CB400 fuel petcock 16951-385-703

1978-81 Honda CB400 Fuel Petcock ~ Replaces 16951-385-703

$15.82 USD
29-0543
Keep fuel flowing reliably to your carburetors with this Fuel Petcock, designed as a direct replacement for several original Honda fuel valve assemblies. This...
Universal motorcycle carburetor synchronizer vacuum gauge 2 carb synchronizer

Universal Motorcycle Carburetor Synchronizer Vacuum Gauge ~ 2 Carb Synchronizer

$54.95 USD
37-0003
Carburetor and throttle body synchronizer kit for bikes with 2 Carbs. Makes synching your carburetor setup fast and easy! For use with Honda, Kawasaki,...
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Honda CB750 CB400 carb float 16013-679-005

1978-79 Honda CB750 / CB400 Carb Float ~ Replaces 16013-679-005

$29.95 USD
20-6506
Replace your 1979 DOHC CB750 or CB400 carb float with this Carb Float with Pin, replacing OEM #16013-679-005.4 carb floats are used per bike,...
New
Honda CB450 CB400 cylinder head intake boot o-rings (set 4) 91301-371-005

1978-86 Honda CB450 / CB400 Cylinder Head Intake Boot O-Rings (Set/4) ~ Replaces 91301-371-005

$8.19 USD
48-5044
Replace your cylinder head intake boot O-rings with this Cylinder Head Intake Boot O-Rings Set of 4, size 40 x 2.6mm. Replaces OEM #91301-371-005...
New
Honda CB450 CB400 carburetor screw kit

1978/1979/1982 Honda CB450 / CB400 Carburetor Screw Kit

$15.90 USD
48-0794
Refresh your CB400 or CB450 carb screws with this Carburetor Screw Kit. Get a new set of screws to clean up the look of...
Honda CB front fuel tank rubber cushion 17611-KE8-000

Front Fuel Tank Rubber Cushion ~ Replaces Honda OEM 17611-KE8-000

$5.50 USD
27-5520
This aftermarket front fuel tank rubber cushion replaces Honda OEM 17611-KE8-000 on the listed Honda CB-series applications. It mounts to the frame and supports...
Honda CB400 air cut off valve 16048-425-671

1978-79 Honda CB400 Air Cut Off Valve ~ Replaces 16048-425-671

$27.03 USD
20-4022
Replace your CB400's carb air cut-off valve with this Carb Air Cut-Off Valve, replacing OEM #16048-425-671 (diaphragm) plus spring and O-ring.Key Features• Carb air...
New
Honda CB450 CB400 stock type air filter 17211-413-000

1978-82 Honda CB450 / CB400 Stock Type Air Filter ~ Replaces 17211-413-000

$18.76 USD
15-0048
Replace your CB400 or CB450T stock air filter with this Stock-Type Air Filter, replacing OEM #17211-413-000.Key Features• Stock-type air filter• Replaces OEM #17211-413-000• Honda...
New
Honda CB700 CB650 CB550 fuel tank front rubber cushion 17611-KE8-000

Honda CB Genuine Honda 17611-KE8-000 Fuel Tank Front Rubber Cushion ~ Replaces 17611-KE8-000

$17.95 USD
99-5145
This genuine Honda front fuel tank rubber cushion mounts to the frame and supports the front of the gas tank on select classic Honda...
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1978 Honda CB400A · Fuel & Intake Buying guide

Trace the purchase from fuel tank to airbox

The available parts cover fuel supply, carburetor service and intake sealing. Keep each repair location clear, and check any changes to the tank or airbox before treating a stock-type replacement as the right choice.

Parts to consider

1978-81 Honda CB400 Fuel Petcock ~ Replaces 16951-385-703 Fuel petcockReplacement fuel valve with M16 × 1.5 tank thread, listed for the 1978 CB400A.View part 1978-86 Honda CB450 / CB400 Cylinder Head Intake Boot O-Rings (Set/4) ~ Replaces 91301-371-005 Intake-manifold O-rings, set of four40 × 2.6 mm O-rings for the manifold-to-cylinder-head joint. Supplied as a four-piece set.View part 1978-82 Honda CB450 / CB400 Stock Type Air Filter ~ Replaces 17211-413-000 Stock-type air filterReplacement for the original-type air-filter application, reference 17211-413-000.View part

Start with the component that is leaking or worn

A tank-valve leak, a float-bowl leak and a worn intake seal require different parts. Locate the fault before combining purchases. If the tank or carburetors have been replaced, identify those assemblies directly rather than relying only on the motorcycle’s year and model.

Keep the original intake arrangement in view

The featured filter replaces reference 17211-413-000 for the stock-type application. The manifold O-rings are a four-piece pack for a different sealing location. Compare the existing airbox and intake joints so the order covers the parts your CB400A actually retains.

Fuel & Intake questions

Will the petcock fit an aftermarket tank?

Only if the tank connection and layout are suitable. The listed valve uses an M16 × 1.5 thread; compare the connection, outlet position and clearance on the changed tank before ordering.

How many intake O-rings are supplied in the set?

The set contains four 40 × 2.6 mm O-rings for the manifold-to-cylinder-head joints. Count the positions being serviced separately; package quantity does not establish how many rings your repair requires.

Is the stock-type air filter suitable for individual pod filters?

It is intended for the original-type air-filter application. A pod-filter conversion uses different mounting and sizing checks; identify the fitted intake system before choosing its replacement filter.

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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