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1978 Honda CB400A Carburetor Rebuild Parts

Carburetor repair choices for the 1978 Honda CB400A include float-bowl seals, a separate float needle and a screw assortment. These purchases address different wear points. Identify the carburetors on the motorcycle before choosing parts, particularly if another model’s carburetors were fitted.

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Currently viewing Carb Rebuild & Jetting

Honda motorcycle parts

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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...
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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,...
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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...
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1978 Honda CB400A · Carburetor Seals & Hardware Buying guide

Build a carburetor repair order by component

A bowl gasket seals the bowl joint, a float needle is a separate component, and the screw kit renews hardware. None of these choices establishes a jetting specification for a modified engine or intake.

Parts to consider

Honda CB1100/CB1000/CB900/CB750 Float Bowl Gasket Float-bowl gasketO-ring-style float-bowl gasket listed for the 1978 CB400A carburetor application.View part Honda CB Float Needle ~ Replaces 16011-382-004 Float needleNeedle-only replacement for reference 16011-382-004, listed for the 1978 CB400A.View part 1978/1979/1982 Honda CB450 / CB400 Carburetor Screw Kit Carburetor screw assortmentIncludes two drain screws with O-rings and assorted replacement screws with lock washers for the listed CB400A application.View part

Separate seals from valve components

The bowl gasket and float needle are sold as distinct products. The needle is described as needle-only, so assess the remaining valve components before ordering. Use CB400A carburetor service information to determine the repair and settings rather than assuming a gasket purchase covers every internal part.

Check the screw assortment against your work

The kit specifies two drain screws with O-rings, plus screws sized 5 × 12, 4 × 16, 6 × 14, 5 × 16, 4 × 12 and 4 × 10 mm with lock washers. Compare the positions being renewed before replacing original hardware.

Carburetor Seals & Hardware questions

Does the float needle come with a replacement seat?

The product is specifically described as a float needle only. If the seat or other valve components also need attention, identify the fitted carburetor and confirm those parts separately before ordering.

Does the screw kit include drain-screw O-rings?

Yes. Its itemized contents include two drain screws with O-rings. Compare the remaining screw sizes with the carburetor hardware you plan to renew rather than assuming every fitted screw is covered.

Are larger jets included for a modified intake or exhaust?

The featured products are a bowl gasket, float needle and hardware assortment. They do not provide a verified jetting package; establish the carburetor identity and tuning requirements separately for a modified motorcycle.

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