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1982 Honda CB450TC Carb Diaphragms & Drain Screws

Identify the carburetor component before ordering for your 1982 Honda CB450TC. The accelerator-pump diaphragm, air cut-off valve and float-bowl drain screw work in different locations. Compare the removed part and its operating role instead of choosing a replacement because it has a similar rubber diaphragm.

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Currently viewing Carb Floats & Other Carb Components

Honda motorcycle parts

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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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1982 Honda CB450TC · Carb Components Buying guide

Separate pump, air cut-off and bowl-drain repairs

The pump kit includes its diaphragm and rod, bellows rubber and O-rings. The air cut-off kit is a different assembly, while the drain screw is supplied individually with an O-ring.

Parts to consider

1980-82 Honda CB900 / CB450 / CB400 Carb Pump Diaphragm ~ Replaces 16021-413-751 Accelerator pump diaphragm kitKeihin pump kit with one diaphragm and rod, one bellows rubber and O-rings; reference 16021-413-751 is included.View part Honda CB Air Cut Off Valve ~ Replaces 16048-429-771 Air cut-off valve kitAir cut-off diaphragm, spring and O-ring; references 16048-429-771 and 16048-425-771.View part Honda CB Stock Type Float Bowl Drain Screw Float bowl drain screwStock-type drain screw supplied with an O-ring. Sold individually for the number of bowls being serviced.View part

Keep the two diaphragm jobs distinct

The accelerator-pump kit has a diaphragm with rod, a bellows rubber and O-rings. The air cut-off kit instead supplies its diaphragm, spring and O-ring. Identify the carburetor location being serviced before deciding which package belongs on the repair list.

Replace bowl-drain parts to match the bowl

The stock-type drain screw includes its O-ring and is sold individually. Check the old screw and the bowl it came from before ordering, particularly when the carburetors have been changed. Damage in the bowl itself needs assessment beyond replacing the screw.

Common buying questions

What comes with the accelerator-pump diaphragm?

The kit includes one diaphragm with rod, one bellows rubber and O-rings. It is specified for the Keihin carburetor pump application; compare the removed assembly before ordering.

Are the air cut-off and accelerator-pump diaphragms interchangeable?

They are separate products for separate carburetor functions. Choose the kit matching the component being repaired; the presence of a rubber diaphragm in both packages does not establish interchangeability.

Is the bowl-drain screw supplied with an O-ring?

Yes. The featured stock-type drain screw comes with an O-ring and is sold individually. Order the number needed for the bowls being serviced, after checking the condition of the bowls themselves.

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