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1986 Honda CB450SC Nighthawk Carburetor Component References and Quantity Checks

Separate carburetor parts for a 1986 Honda CB450SC Nighthawk require different identification checks. The pump package gives its written contents and Honda references. The float is supplied individually with its pin but needs quantity clarification. A drain screw has a supplied O-ring and must match the actual bowl’s screw geometry.

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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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1986 Honda CB450SC Nighthawk · Float, Pump & Bowl Drain Buying guide

Use the written component identity instead of a broad family total

The pump replaces 16021-393-004, 16021-393-014 or 16021-MC9-771 and supplies one diaphragm with rod plus one bellows rubber. Float 16013-413-851 includes its pin. The selected drain screw includes one O-ring and requires matching thread, tip, head and O-ring position against the removed part.

Parts to consider

Honda CB750 / CB650 / CB450 Carb Pump Diaphragm ~ Replaces 16021-393-004 Referenced accelerator-pump diaphragm packageOne 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 and pinOne float with its pin; obtain application-specific confirmation of the required complete-service quantity.View part Honda CB Stock Type Float Bowl Drain Screw ~-A Bowl drain screw with its O-ringOne screw and one O-ring; compare thread, tip, head and O-ring position with the fitted carburetor.View part

Keep the pump’s CB650 measurement note within that application

The 89 mm end-to-end pin requirement is stated for the listed CB650 applications. It is not published as the CB450SC pin measurement. Match the documented pump reference and actual removed component for this motorcycle, and confirm any separately needed piece rather than treating unlisted photo contents as included.

Resolve the float count before ordering complete-service supplies

The float listing combines several Honda families with a broad four-per-motorcycle statement, while clearly saying that each float is individual and includes its pin. Ask for the quantity for the actual fitted carburetors. Use the exact model’s Honda float-height or fuel-level specification rather than assuming a shared numerical setting.

Parts ordering FAQs

What should I ask when the float listing gives a broad four-per-bike count?

Ask for the complete-service quantity for the carburetors actually fitted to this CB450SC. The listing clearly supplies one 16013-413-851 float with its pin, but its broad four-count spans several Honda families. Resolve that application-specific count before multiplying the individual-item order.

Which pump information applies here rather than the CB650 pin-length note?

Use the pump’s listed references 16021-393-004, 16021-393-014 and 16021-MC9-771 and its diaphragm-with-rod plus bellows contents. The 89 mm pin requirement is qualified for CB650 applications. No CB450SC pin measurement or additional supplied spring is established by that wording.

What details should be sent when identifying a drain screw for an altered carburetor?

Identify the carburetor and compare the removed screw’s thread, tip, head and O-ring position. Include the retained seat’s condition in the assessment. The listing supplies one screw with one O-ring, but similar appearance or a shared motorcycle family cannot establish that geometry match.

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