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1985 Honda CB450SC Nighthawk Float Pin and Pump Component Selection

Individual carburetor components for a 1985 Honda CB450SC Nighthawk have different supplied pieces and reference checks. The accelerator-pump item lists a diaphragm with rod and bellows rubber; the float includes its pin; and the drain screw includes an O-ring. Identify the component needing renewal before combining those separate purchases.

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Honda CB750 CB650 CB450 carb pump diaphragm 16021-393-004

Honda CB750 / CB650 / CB450 Carb Pump Diaphragm ~ Replaces 16021-393-004

$27.95 USD
20-9040
Rebuild your Keihin carb's accelerator pump with this Carb Pump Diaphragm, replacing OEM #16021-393-004 / #16021-393-014 / #16021-MC9-771. Kit contains 1 diaphragm with rod...
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 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,...
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1985 Honda CB450SC Nighthawk · Floats, Pump & Drains Buying guide

Keep the pump, float and bowl-drain evidence separate

Pump references are 16021-393-004, 16021-393-014 and 16021-MC9-771. The float identifies 16013-413-851 and individual supply with its pin. The chosen drain screw is matched by thread, tip, head and O-ring position. No confirmed CB450SC float total is given here because the broad listing’s quantity requires clarification.

Parts to consider

Honda CB750 / CB650 / CB450 Carb Pump Diaphragm ~ Replaces 16021-393-004 Accelerator-pump diaphragm and bellowsStated package is one diaphragm with rod and one bellows rubber; references 16021-393-004 / 16021-393-014 / 16021-MC9-771.View part Honda CB Carb Float ~ Replaces 16013-413-851 Individual 16013-413-851 float with pinEach float includes its pin; confirm the number needed rather than using the listing’s broad four-per-bike statement.View part Honda CB Stock Type Float Bowl Drain Screw ~-A Drain screw with its O-ringOne screw and one O-ring per item; compare thread, tip, head and seal position.View part

Read the pump’s measurement qualification within its stated application

The pump description and listing attach the 89 mm end-to-end pin requirement specifically to the named CB650 applications. They do not assign that measurement to the CB450SC. For this motorcycle, match the documented Honda reference and actual pump requirement without importing another model’s qualification or unlisted package pieces.

Resolve the float quantity while keeping its clear supply facts

The float’s individual supply and included pin are explicit. Its general four-per-motorcycle statement appears alongside multiple Honda families, including CB450 applications, so confirm the required quantity for the actual carburetors before ordering. The listing requires the correct model-specific float-height setting and gives no universal numerical value.

Parts ordering FAQs

Which references and components identify the stated accelerator-pump package?

Match 16021-393-004, 16021-393-014 or 16021-MC9-771 with the required pump component. The written package contains one diaphragm with rod and one bellows rubber. It does not itemize an additional seal or spring supply, so confirm any separately needed piece.

How should I confirm float quantity for complete service of the fitted carburetors?

Confirm the float count required by the carburetors actually fitted before ordering for complete service. Each 16013-413-851 item supplies one float and its pin. The listing’s broad four-per-motorcycle statement needs application-specific clarification for this CB450SC rather than an assumed total.

What should I assess before replacing a bowl-drain screw with a worn seal?

Compare the screw’s thread, tip, head and O-ring position, then assess the seat for cleaning and the O-ring for hardening. The listing warns that excessive tightening can damage the screw or bowl. Use those checks to identify the replacement need without compensating with extra force.

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