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1983 Honda CB450SC Nighthawk Engine Repair & Service Choices

Write down the work planned for your 1983 CB450SC Nighthawk before choosing engine parts. Oil-filter service calls for a different order from renewing valve adjusters or opening the valve cover. Use the existing parts and their Honda references to turn that repair list into specific quantities.

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Honda motorcycle parts

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Honda CB1100 CB1000 CB900 CB750 oil filter washer set 15414-300-000

Honda CB Oil Filter Washer Set ~ Replaces 15414-300-000

$7.95 USD
15-0039
Fit oil filter washers with this Oil Filter Washer 5-pack, replacing OEM #15414-300-000. Used with original-type paper oil filter elements. Exceptionally broad fitment across...
Honda CB1100 CB1000 CB900 CB750 CB450 magnetic oil drain plug

Honda CB Magnetic Oil Drain Plug

$10.95 USD
15-0014
Catch steel debris on oil changes with this Magnetic Oil Drain Plug, 14mm diameter x M1.5, replacing OEM #92800-14000. Fits the CB750A Hondamatic, full...
Honda CB1100 CB1000 CB900 CB750 oil filter washer each 15414-300-000

Honda CB Oil Filter Washer ~ Each ~ Replaces 15414-300-000

$2.95 USD
15-0042
Oil filter washer designed to replace the original Honda component, matching OEM reference 15414-300-000. Used to create a proper seal at the oil filter...
Honda CB750 CB650 CB550 front sprocket lock plate set 23811-292-000

Honda CB Front Sprocket Lock Plate Set ~ Replaces 23811-292-000

$5.95 USD
49-0782
Replace your front sprocket lock plate with this Front Sprocket Lock Plate with 2 lock plate bolts. Always good to replace these when installing...
Honda CB1100 CB1000 tach drive oil seal 4.8 x 14.5 x 5 91256-425-003

Honda CB Tach Drive Oil Seal ~ 4.8 x 14.5 x 5 ~ Replaces 91256-425-003

$4.95 USD
73-0964
Replace your tach drive oil seal with this Tach Drive Oil Seal, 4.8 x 14.5 x 5, replacing OEM #91256-425-003. High-quality, made in Japan.Key...
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Honda CB1100 CB1000 CB900 CB750 drain plug washer

Honda CB1100/CB1000/CB900/CB750 Drain Plug Washer

$1.75 USD
15-0000
Replace your oil drain plug washer with this 14mm x 20mm x 1mm Drain Plug Washer. Broad fitment across the CB750A Hondamatic, the full...
New
Honda CB750 CB550 CB500 rear shock swingarm bushing 40548-268-000

Honda CB Rear Shock Swingarm Bushing ~ Replaces 40548-268-000

$6.20 USD
28-6918
Rear shock swingarm bushing designed to replace the original Honda component, matching OEM reference 40548-268-000. Fits between the shock and swingarm to provide proper...
Honda CB750 CB650 CB550 tappet adjuster screw and nut set 90012-426-000

Honda CB Tappet Adjuster Screw & Nut Set ~ Replaces 90012-426-000

$4.61 USD
49-0784
Replace your tappet adjuster screws and nuts with this Tappet Adjuster Screw & Nut Set. Each set includes one tappet adjuster screw and one...
Honda CB450 CB400 oil filter 15412-413-005

1978-86 Honda CB450 / CB400 Oil Filter ~ Replaces 15412-413-005

$8.95 USD
15-0007
Service your CB400 or CB450 with this Stock-Type Oil Filter Element (paper filter), replacing OEM #15412-413-005 / #154A1-413-005 / #154A1-MA6-000.Key Features• Stock-type paper oil...
Honda CB750 CB450 CB400 CB350 CL450K0 steel front sprocket 17 tooth

Honda CB Steel Front Sprocket ~ 17 Tooth

$23.45 USD
99-4817
Front sprocket designed for a range of Honda models. A critical drivetrain component, it transfers power from the engine to the chain, making proper...
New
Honda CB400 CB450 exhaust valve 14721-413-000

Honda CB400 / CB450 Exhaust Valve ~ Replaces 14721-413-000

$19.95 USD
01-9962
Restore proper engine performance with this Exhaust Valve, designed as a direct replacement for the original Honda component. This valve replaces OEM part number...
Honda CB750 CB450 CB400 CB360 CB77 valve guide clip 12211-250-310

Honda CB Valve Guide Clip ~ Replaces 12211-250-310

$1.95 USD
73-0939
Replace your valve guide clip with this Valve Guide Clip, replacing OEM #12211-250-310.Sold each, order the quantity you require.Key Features• Valve guide clip• Replaces...
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Honda CB400 CB450 intake valve 14711-235-010

Honda CB400 / CB450 Intake Valve ~ Replaces 14711-235-010

$19.95 USD
01-9961
Restore proper engine performance with this Intake Valve, designed as a direct replacement for the original Honda component. This valve replaces OEM part number...
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Honda CB450 CB400 valve cover gasket 12328-413-830

1978-86 Honda CB450 / CB400 Valve Cover Gasket ~ Replaces 12328-413-830

$31.95 USD
12-1014
Replace your CB400 or CB450 valve cover gasket with this Athena Brand Valve Cover Gasket, replacing OEM #12328-413-830. Fits the full CB400A/TI/TII/T range plus...
Honda CB400 CB450 silent cam chain a 412H x 110 14401-MR4-901

Honda CB400 / CB450 Silent Cam Chain A 412H x 110

$89.95 USD
01-0206
Keep your CB400 or CB450 running quiet and in spec with this Silent Cam Chain A, 412H x 110 links. High-quality construction made in...
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Honda CB450SC CB450TC Athena overhaul gasket set

1982-86 Honda CB450SC / CB450TC Athena Overhaul Gasket Set

$99.95 USD
18-0104
Rebuild your CB450T or CB450SC engine with this Athena Overhaul Engine Gasket Set. Athena of Italy is an original-equipment supplier to Yamaha, Honda, Kawasaki,...
Honda CB450 CB400 oil filter bolt 15420-413-000

1978-86 Honda CB450 / CB400 Oil Filter Bolt ~ Replaces 15420-413-000

$28.95 USD
15-3021
Fit the CB400 or CB450 oil filter bolt with this Oil Filter Bolt, replacing OEM #15420-413-000.Key Features• Oil filter bolt• Replaces OEM #15420-413-000• Honda...
Honda CB400 CB450 CB125 valve stem seal 12208-413-003

Honda CB400 / CB450 / CB125 Valve Stem Seal

$3.10 USD
01-0128
Stop top-end oil loss with this Valve Stem Seal, a replacement for OEM #12208-413-003 / #12209-KL4-005 / #12209-428-003. Fits a range of smaller-displacement Hondas,...
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1983 Honda CB450SC Nighthawk · Engine Buying guide

Turn the repair list into a parts order

The paper element is supplied singly, the tappet hardware comes as a screw-and-locknut set for one valve, and the main valve-cover gasket is a separate purchase. For deeper work, compare the overhaul gasket set with the joints you will open rather than judging its contents by the photograph.

Parts to consider

Honda CB Tappet Adjuster Screw & Nut Set ~ Replaces 90012-426-000 Valve adjuster and its locknutEach package provides adjuster 90012-426-000 with locknut 90206-250-000 for one valve. The listed CB450 twin needs six sets to renew every position; a partial repair needs only the affected sets.View part 1978-86 Honda CB450 / CB400 Oil Filter ~ Replaces 15412-413-005 Stock-style paper filter elementThis element matches the three listed Honda filter references and is supplied as one filter. Compare the installed filter assembly before treating an old or modified engine as an original arrangement.View part 1978-86 Honda CB450 / CB400 Valve Cover Gasket ~ Replaces 12328-413-830 Athena main valve-cover gasketReference 12328-413-830 identifies the main cover gasket, with one supplied for one compatible engine. Separate cover washers, grommets or plugs need their own condition and reference checks.View part

Related parts: Overhaul gasket set for a broader repair · Stem seal for the listed intake positions · Silent cam chain, 412H × 110

Use package quantities to finish the list

A screw-and-nut set services one valve, while the oil filter and main valve-cover gasket each have a stated one-per-engine requirement. Keep those counts attached to the work being done. None of these package names establishes the contents of a separate overhaul gasket set.

Separate an intake-seal order from exhaust work

The stem seal references 12208-413-003, 12209-KL4-005 and 12209-428-003 apply to the listed intake positions. Four are used there on the CB450 twin, whereas its two exhaust valves use a different seal specification. Identify the valve position before buying seals.

Engine ordering questions

What should I order when renewing only some tappet adjusters?

Count the valves whose adjusters need replacement and order that many sets. Each contains a screw and locknut for one valve. Six sets cover the listed CB450 twin, so a complete-engine quantity is unnecessary for a smaller repair.

What else needs checking when the valve cover is opened?

The Athena gasket supplies the main cover seal. Check the exact model’s separate sealing washers, grommets and rubber plugs for hardening or damage, and order those independently when needed rather than assuming they accompany the main gasket.

How should I assess the overhaul gasket set against my repair list?

Match its stated CB450SC application to the installed engine, then confirm the pieces needed at every joint you plan to open. The description gives no itemized contents list, so photograph shapes alone cannot confirm a particular seal or gasket.

Not sure which part you need?

Send your model and year, plus photos of your existing part and any changes to the original setup.

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