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1979 Honda CB400TII Hawk II Carburetor Service Components

Bowl-drain leaks and worn air cut-off components lead to different carburetor orders. For the 1979 Hawk II, compare the drain screw and its seal with the diaphragm, spring and O-ring used in the separate air cut-off assembly.

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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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1979 Honda CB400TII Hawk II · Carburetor Service Components Buying guide

Identify the carburetor component before buying the kit

These selections give two clearly defined service choices. Match the affected carburetor location and inspect the removed pieces before deciding which package belongs on the repair list.

Parts to consider

Honda CB Stock Type Float Bowl Drain Screw Bowl drain screw with O-ringStock-type drain screw supplied with its O-ring. Sold individually for the carburetor being serviced.View part 1978-79 Honda CB400 Air Cut Off Valve ~ Replaces 16048-425-671 Air cut-off valve kitDiaphragm, spring and O-ring for carburetor air cut-off service; diaphragm reference 16048-425-671.View part

Order bowl drains as individual pieces

The featured drain screw is supplied with its O-ring and is sold individually. Count the affected bowls before ordering, rather than treating one item as a pair. Inspect the mating drain area as well so the replacement addresses a damaged screw or seal in a serviceable location.

Keep the air cut-off parts together

The air cut-off selection includes the diaphragm, spring and O-ring, with diaphragm reference 16048-425-671. Compare the removed assembly and the carburetor identity before ordering. Follow the Honda carburetor service instructions for inspection and reassembly rather than using a generic carburetor setting.

Ordering questions

Is an O-ring supplied with the drain screw?

Yes. The stock-type drain screw includes its O-ring and is sold each. Count one replacement for each affected bowl after inspecting the fitted screws and sealing locations.

What comes with the air cut-off diaphragm?

The air cut-off selection includes the diaphragm, spring and O-ring. Its diaphragm reference is 16048-425-671 and the application explicitly includes the 1978–79 CB400TII.

How should I choose parts for replacement carburetors?

Identify the carburetor bodies and compare the actual drain or air cut-off assembly. A motorcycle-year match is insufficient if a different carburetor pair has been fitted.

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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