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1978 Honda CB400TII — Flotteurs et composants de carburateur

Small carburetor parts should be chosen by the fault and their exact location. A damaged drain screw or hardened O-ring calls for a different repair from a deteriorated air cut-off diaphragm. Inspect the fitted carburetor before ordering either service item for your Hawk II.

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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,...
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,...
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...
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1978 Honda CB400TII Hawk II · Carburetor Small Parts Buying guide

Match the small part to its carburetor location

The drain screw includes an O-ring and is sold individually. The air cut-off choice combines a diaphragm, spring and O-ring for its separate location on the carburetor.

Parts to consider

Honda CB Stock Type Float Bowl Drain Screw Bowl drain screw with O-ringIndividual stock-type float-bowl drain screw supplied with an O-ring for the listed Hawk II carburetors.Voir la pièce 1978-79 Honda CB400 Air Cut Off Valve ~ Replaces 16048-425-671 Air cut-off valve componentsCarburetor air cut-off diaphragm with spring and O-ring, corresponding to diaphragm reference 16048-425-671.Voir la pièce

Check the drain-screw seat

Inspect the bowl and screw seat when dealing with a drain leak. A damaged screw or O-ring can be replaced, but damage to the bowl itself needs separate attention. Avoid using extra tightening as a substitute for identifying the source of leakage.

Identify diaphragm service correctly

Keep the air cut-off diaphragm, spring and O-ring together when reviewing the repair. Compare the original arrangement and use the Honda manual for disassembly and checks. Do not treat this purchase as a cure for every deceleration or idle complaint without diagnosis.

Common questions

Does the drain screw come with an O-ring?

Yes. The featured stock-type drain screw includes its O-ring and is sold individually. Count the drain positions you are servicing before ordering, rather than assuming a two-carburetor pack.

What comes with the air cut-off valve?

The offered service parts are the diaphragm, spring and O-ring. Compare them with the fitted carburetor’s air cut-off assembly and inspect the surrounding parts before deciding what the repair requires.

Will a new screw fix every float-bowl drain leak?

No. Inspect the screw, O-ring and the bowl’s sealing area to find the cause. If the seat or bowl is damaged, replacing only the screw may leave the underlying fault unresolved.

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