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1983 Honda CB450SC Nighthawk Later Carburetor & Intake Planning

The 1983 Honda CB450SC Nighthawk fuel order uses the later carburetor kit and a different pump-diaphragm listing from the 1982 application. Identify the installed carburetors before buying either. Intake holders, tank cap and stock filter provide separate service choices with their own package contents.

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Honda CB throttle sleeve 53141-300-010

Honda CB Throttle Sleeve ~ Replaces 53141-300-010

$9.95 USD
02-2462
Refresh the throttle feel on your Honda with this Nylon Throttle Sleeve, a replacement for OEM Ref. #53141-300-010 with exceptionally broad fitment across the...
Honda CB1100 CB1000 CB900 CB750 float bowl gasket

Honda CB1100/CB1000/CB900/CB750 Float Bowl Gasket

$9.50 USD
20-8031
Replace your DOHC CB float bowl gasket with this Float Bowl Gasket (O-ring). Broad fitment across the 1979-82 CB750 family, CB750SC Nighthawk, CB900/CB1000/CB1100, CB650...
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 CB700 carb float needle 16155-413-751

Honda CB Carb Float Needle ~ Replaces 16155-413-751

$8.95 USD
48-5011
Replace your DOHC CB float needle (only) with this Float Needle, replacing OEM #16155-413-751.Key Features• Float needle (only)• Replaces OEM #16155-413-751• Honda part name:...
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 CB750C CB750SC CB900C CB1000C gas fuel tank cap 17620-460-067

Honda CB Gas / Fuel Tank Filler Cap ~ Replaces 17620-460-067

$44.95 USD
65-6508
Replace your gas tank cap with this OEM Type Gas/Fuel Tank Cap with gasket and 2 keys, replacing OEM #17620-460-067.Key Features• OEM-type gas /...
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,...
Universal motorcycle carburetor synchronizer vacuum gauge 2 carb synchronizer

Universal Motorcycle Carburetor Synchronizer Vacuum Gauge ~ 2 Carb Synchronizer

$54.95 USD
37-0003
Carburetor and throttle body synchronizer kit for bikes with 2 Carbs. Makes synching your carburetor setup fast and easy! For use with Honda, Kawasaki,...
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Honda CB450 CB400 cylinder head intake boot o-rings (set 4) 91301-371-005

1978-86 Honda CB450 / CB400 Cylinder Head Intake Boot O-Rings (Set/4) ~ Replaces 91301-371-005

$8.19 USD
48-5044
Replace your cylinder head intake boot O-rings with this Cylinder Head Intake Boot O-Rings Set of 4, size 40 x 2.6mm. Replaces OEM #91301-371-005...
Honda CB450 CB400 carb holder with o-ring 16211-447-670

1980-86 Honda CB450 / CB400 Carb Holder with O-Ring ~ Replaces 16211-447-670

$24.95 USD
33-0017
Ensure a secure and reliable connection between the carburetor and intake with this Carb Holder with O-Ring, designed as a direct replacement for the...
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Honda CB450SC carb rebuild kit

1983-86 Honda CB450SC Carb Rebuild Kit

$17.95 USD
48-1397
Rebuild your CB450SC Nighthawk carb with this Carb Rebuild Kit.Note: each kit rebuilds one carb, order the quantity you require.Key Features• Carb rebuild kit•...
Honda CB450SC stock type air filter 17211-447-000

1982/1983/1985 Honda CB450SC Stock Type Air Filter ~ Replaces 17211-447-000

$18.95 USD
15-0065
Replace your CB450SC Nighthawk air filter with this Stock-Type Air Filter, replacing OEM #17211-447-000.Key Features• Stock-type air filter• Replaces OEM #17211-447-000• Honda part name:...
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1983 Honda CB450SC Nighthawk · Fuel & Intake Parts Buying guide

Identify the later carburetor parts before combining packages

The later kit services one carburetor, with two kits specified for the complete system. The pump listing supplies a diaphragm with rod and bellows. Each holder includes one sealing ring, and two holders service both intake connections. The stock filter applies to the original airbox.

Parts to consider

1983-86 Honda CB450SC Carb Rebuild Kit Later-application one-carb service kitListed for 1983–1986 CB450SC carburetors, with one kit per carburetor and two specified for complete-system service.View part Honda CB750 / CB650 / CB450 Carb Pump Diaphragm ~ Replaces 16021-393-004 Later pump diaphragm with bellowsSupplies one diaphragm with rod and one bellows rubber; references include 16021-MC9-771 for the listed application.View part 1980-86 Honda CB450 / CB400 Carb Holder with O-Ring ~ Replaces 16211-447-670 One intake holder with its sealOne holder and O-ring are supplied together; two holder assemblies are needed for both listed intake connections.View part

Related parts: Filter for the original airbox · Cap package with gasket and two keys · Universal two-gauge vacuum tool

Do not substitute the first-year carburetor application

The current kit FAQ identifies later Nighthawk carburetors and distinguishes the separate 1982 kit. A swapped assembly still needs comparison of carburetor model, bowl shape and original metering and sealing parts. Neither the kit title nor the motorcycle year publishes the complete contents or jet sizes.

Keep accessory compatibility tied to the actual intake

The synchronization tool is universal/custom equipment with two gauges and 5 mm-thread adapters. Check the fitted vacuum connections before ordering it. The air filter is instead a specific original-airbox replacement, so a changed intake arrangement needs its own filter identification.

Common questions

Which carburetor application should I check after finding a swapped assembly?

Identify the fitted carburetor model and compare its bowl shape, jets, needles, gaskets and O-rings with the required application. The current kit is for later 1983–1986 Nighthawk carburetors, explicitly distinguished from the separate 1982 kit in its FAQ.

Are the later pump diaphragm’s O-rings included in its stated package?

The current pump listing itemizes one diaphragm with rod and one bellows rubber; it does not list O-rings among those contents. Match its reference family and confirm any additional sealing requirement separately rather than borrowing another pump package’s contents.

Will the two-gauge vacuum tool connect to every replacement carburetor?

The tool is listed as universal/custom for two-carb setups and provides 5 mm-thread extensions. Confirm the replacement carburetor’s vacuum connections against those adapters. Its two gauges, hoses and dampening valves do not establish compatibility with every modified carburetor arrangement.

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