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1981 Honda CB400TB Carburetor Components

Drain screws, air-cut valves and accelerator-pump diaphragms occupy different parts of the Hawk’s carburetors. Match the component to the fault before buying. The featured choices cover a sealed bowl drain, air-cut service and the separate accelerator-pump assembly on the listed 1981 application.

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Most orders ship same or next business day Fitment guarantee Listed for your exact model and year? We’ll make it right if it doesn’t fit as described. Mechanic-backed support Ask our team for help choosing the right Honda CB part.
Currently viewing Carb Floats & Other Carb Components

Honda motorcycle parts

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

Honda CB1100 CB1000 CB900 CB750 CB650 carb float 16013-413-851

Honda CB Carb Float ~ Replaces 16013-413-851

$27.95 USD
20-6507
Replace your 1980+ DOHC CB carb float with this Carb Float with Pin, replacing OEM #16013-413-851. Broad fitment across the 1980-82 CB750 family, CB750SC...
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 CB900 CB750 CB650 CB450 CB400 air cut off valve 16048-429-771

Honda CB Air Cut Off Valve ~ Replaces 16048-429-771

$26.95 USD
20-4020
Replace your DOHC CB's carb air cut-off valve with this Carb Air Cut-Off Valve, replacing OEM #16048-429-771 (diaphragm) and #16048-425-771 (spring + 1 O-ring).Key...
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 CB900 CB450 CB400 carb pump diaphragm 16021-413-751

1980-82 Honda CB900 / CB450 / CB400 Carb Pump Diaphragm ~ Replaces 16021-413-751

$27.03 USD
20-9041
Rebuild your Keihin carb's accelerator pump with this Carb Pump Diaphragm, replacing OEM #16021-413-751 / #16021-438-671 / #16021-463-004. Kit contains 1 diaphragm with rod,...
Honda CB900 CB750 CB650 air cut off valve with cover 16048-429-771

Honda CB Air Cut Off Valve With Cover ~ Replaces 16048-429-771

$34.95 USD
48-9029
Replace your carb air cut-off valve with this Carb Air Cut-Off Valve with Cover. Replaces OEM #16048-429-771 (diaphragm), #16048-425-771 (spring + 1 O-ring), and...
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1981 Honda CB400TB · Carburetor Components Buying guide

Identify the small carburetor assembly being serviced

A similar-looking diaphragm is not enough to establish function. Keep the air-cut valve and accelerator pump distinct, compare the drain screw with the fitted bowl and count the service positions actually being repaired.

Parts to consider

Honda CB Stock Type Float Bowl Drain Screw Bowl drain screw with O-ringOne stock-type drain screw with its O-ring, sold individually.View part Honda CB Air Cut Off Valve ~ Replaces 16048-429-771 Air-cut valve componentsDiaphragm, spring and O-ring for the listed CB400T air-cut valve application.View part 1980-82 Honda CB900 / CB450 / CB400 Carb Pump Diaphragm ~ Replaces 16021-413-751 Accelerator-pump diaphragm kitIncludes one diaphragm with rod, one bellows rubber and O-rings for the Keihin pump.View part

Compare the two diaphragm jobs

The air-cut selection provides its diaphragm, spring and O-ring. The accelerator-pump kit instead includes a diaphragm with rod, a bellows rubber and O-rings. Match the failed assembly and its parts before ordering; a shared material or round shape does not make the kits interchangeable.

Inspect the drain screw and bowl together

The drain screw includes its O-ring and is sold individually. Inspect the bowl’s threads and sealing area before replacing the screw. A new screw is useful for a damaged or missing part, but it cannot correct every defect in the surrounding carburetor casting.

Buying questions

Which kit includes a diaphragm with a rod?

The accelerator-pump kit includes one diaphragm with rod, one bellows rubber and O-rings. The air-cut valve components serve a separate carburetor function and should be selected for that assembly.

Does the drain screw come with its seal?

Yes. The featured stock-type drain screw includes an O-ring and is sold individually. Compare the screw and bowl first, then order the number of drain positions you are repairing.

Can these components be selected for replacement carburetors by bike year?

Identify the installed carburetors first. A swapped set may use different drain fittings, diaphragms or covers, so compare its identification and component arrangement before relying on the original motorcycle application.

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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