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1982 Honda CB450SC Nighthawk Carb Float & Diaphragm Parts

Several small carburetor components are listed for the 1982 Honda CB450SC Nighthawk, with different package contents. A float comes with its pin, the accelerator-pump package has a rod and bellows, and the air-cut valve is offered with or without a cover. Match each to the fitted assembly.

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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 CB450SC Nighthawk · Carb Floats & Service Components Buying guide

Read each package before combining the service order

The pump kit supplies one diaphragm with rod, bellows rubber and O-rings for one compatible rack. The cover-equipped air-cut package includes diaphragm, spring, one O-ring and cover. The drain screw supplies its O-ring. Inspect the actual carburetor components rather than grouping all diaphragm parts together.

Parts to consider

Honda CB Carb Float ~ Replaces 16013-413-851 Individually supplied float with pinFloat with pin identifying Honda 16013-413-851; confirm the installed carburetor application and count the pieces being serviced.View part 1980-82 Honda CB900 / CB450 / CB400 Carb Pump Diaphragm ~ Replaces 16021-413-751 Accelerator-pump diaphragm packageIncludes one diaphragm with rod, bellows rubber and O-rings for the listed compatible Keihin pump assembly.View part Honda CB Air Cut Off Valve With Cover ~ Replaces 16048-429-771 Air-cut valve package with coverIncludes diaphragm, spring, one O-ring and cover for the stated 1982 CB450SC application.View part

Related parts: Drain screw supplied with O-ring · Air-cut valve package without cover

Treat the float quantity as an individual-piece order

The float is sold individually with its pin. Its broad multi-model listing includes a four-float statement that does not distinguish the CB450 application, so use the actual pieces being serviced to build this order. Match the float reference and follow the correct carburetor-specific height procedure.

Choose the air-cut bundle by cover condition

The package without a cover supplies diaphragm, spring and one O-ring. The other adds a cover. Compare the existing cover and sealing area before choosing between them, and keep the accelerator-pump diaphragm package separate because it supplies a different assembly’s service pieces.

Common questions

Which accelerator-pump pieces are included in the diaphragm package?

The listing supplies one diaphragm with rod, one bellows rubber and the required O-rings for one compatible carburetor rack. Match the fitted Keihin pump assembly and the listed Honda references before ordering; it is a distinct package from the air-cut valve.

How do I choose the air-cut package with or without a cover?

Both packages list a diaphragm, spring and one O-ring. The cover-equipped version adds the cover. Inspect the fitted cover and sealing surface, then choose the bundle that supplies the pieces needed for that matched air-cut assembly.

How many drain screws are supplied for the listed CB450 application?

One drain screw with its O-ring is supplied per order. The drain-screw FAQ specifies two for the listed CB450 twins when replacing both. Compare the screw and bowl seat first, and order only the locations needing the matched part.

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