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1978 Honda CB400TI Hawk I Carburetor Service Parts

A leaking bowl drain and a worn air cut-off diaphragm call for different carburetor parts. These Hawk I choices separate an individually sold drain screw with O-ring from the air cut-off diaphragm kit, so the purchase can follow the actual component needing service.

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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 CB400TI Hawk I · Carburetor Service Parts Buying guide

Identify the carburetor service point first

The drain screw seals at the bowl. The air cut-off assembly uses a diaphragm, spring and O-ring. Compare the removed component before choosing between these two repair options.

Parts to consider

Honda CB Stock Type Float Bowl Drain Screw Bowl drain screw with O-ringStock-type carburetor bowl drain screw supplied with an O-ring. Sold individually.View part 1978-79 Honda CB400 Air Cut Off Valve ~ Replaces 16048-425-671 Air cut-off diaphragm kitCarburetor air cut-off diaphragm replacing reference 16048-425-671, supplied with a spring and O-ring.View part

Check the bowl as well as its drain screw

The replacement drain screw includes an O-ring and is sold individually. Inspect the mating area and bowl threads during diagnosis. Replacing a screw cannot be assumed to repair damaged threads or a cracked bowl, so assess the surrounding component before placing the order.

Keep diaphragm service separate from fuel-level parts

The air cut-off kit contains the diaphragm, spring and O-ring for that carburetor circuit. It is a different purchase from a float or float needle. Compare the reference and the existing assembly, using the service manual for the appropriate inspection procedure.

Common buying questions

Is a sealing O-ring supplied with the drain screw?

Yes. Each stock-type bowl drain screw is supplied with an O-ring and is sold individually. Order the number of screws required for the carburetor bowls being repaired.

What comes with the air cut-off diaphragm?

The specified package includes the diaphragm referencing 16048-425-671, a spring and an O-ring. Compare that assembly with the fitted carburetor before choosing it for the repair.

What should I inspect before buying a screw for a leaking drain?

Check the existing O-ring, screw, bowl threads and sealing area. A replacement screw with its seal is useful when those are the worn pieces, but damage in the bowl requires separate attention.

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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