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1986 Honda CB450SC Nighthawk Fuel Repair Coverage and Component Matching

Fuel service on a 1986 Honda CB450SC Nighthawk begins with the equipment actually fitted. A later carburetor kit covers one carb, a new intake holder already includes its seal, and the petcock kit has a defined soft-parts package. Decide the repair locations first, then count the matching supplies without duplicating included pieces.

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Honda motorcycle parts

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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 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•...
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Honda CB700 CB650 CB550 CB450 fuel petcock repair kit

Honda CB700 / CB650 / CB550 / CB450 Fuel Petcock Repair Kit

$27.95 USD
20-0020
Rebuild your Nighthawk fuel petcock with this Fuel Petcock Repair Kit. Includes a diaphragm, spring, and 2 O-rings.Key Features• Fuel petcock repair kit• Includes...
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1986 Honda CB450SC Nighthawk · Fuel System Buying guide

Assign a confirmed package to each carburetor, joint or valve being serviced

The 1983–86 kit specifies two packages for the complete matched carburetor system. Intake holders are individual assemblies with one O-ring each, two used. The petcock package contains one diaphragm, one spring and two O-rings for the listed 1985–86 valve. A two-gauge synchronizer has universal connections that require their own comparison.

Parts to consider

1983-86 Honda CB450SC Carb Rebuild Kit Later Nighthawk kit with one-carb coverageOne kit per matched carburetor, two for the stated complete 1983–86 system; individual contents require confirmation.View part 1980-86 Honda CB450 / CB400 Carb Holder with O-Ring ~ Replaces 16211-447-670 Holder assembly with its joint sealOne holder plus one O-ring; two assemblies replace both listed intake connections.View part Honda CB700 / CB650 / CB550 / CB450 Fuel Petcock Repair Kit Defined petcock soft-parts packageOne diaphragm, one spring and two O-rings for one compatible 1985–86 CB450SC petcock.View part

Related parts: Two-gauge synchronizer with 5 mm threaded extensions · 17620-460-067 cap with gasket and two keys

Confirm a carburetor kit’s critical pieces before adding separate items

The kit listing defines its model application and one-carb coverage but does not itemize every included component or publish jet sizes. Compare the carburetor model, bowl shape and removed service pieces. If a specific needle or gasket drives the order, confirm its inclusion rather than deciding from the photograph.

Inspect sealing surfaces before committing to soft parts alone

A damaged petcock body may not be repairable with the listed diaphragm, spring and O-rings. Intake seals also depend on sound holders and mounting faces. Examine those retained assemblies before buying soft parts alone, and include any required holder or hard-part work in the repair plan.

Parts ordering FAQs

How can I avoid duplicating intake seals in a mixed fuel-service order?

Count the O-ring already included with each new holder assembly. For compatible retained holders, the separate pack contains four 40 × 2.6 mm rings, with two used per motorcycle. Decide which joints receive holders and which receive only seals before combining the packages.

Which connection details should be compared before buying the two-gauge tool?

Compare the carburetor vacuum connections with the supplied 5 mm threaded extensions, listed at 180 mm and 65 mm lengths. The tool also includes hoses and dampening valves. Its universal/custom application requires a connection check rather than a guaranteed fit to replacement carburetors.

What tank-valve finding can make the listed petcock kit unsuitable for the repair?

The listing warns that a badly pitted or cracked valve body cannot be repaired with soft parts. Check the body and sealing faces for corrosion or damage and assess the fuel passages. Confirm those retained conditions before choosing the one-valve diaphragm, spring and two-O-ring package.

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