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1982 Honda CB450SC Nighthawk Valves & Valve Seals

Plan cylinder-head purchases for your 1982 CB450SC Nighthawk by valve position and the condition of the existing head. Intake and exhaust valves are individually supplied. The stem seal offered here has a specific intake application, while a separate guide clip depends on the guide design.

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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...
New
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...
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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1982 Honda CB450SC Nighthawk · Valvetrain Parts Buying guide

Count the valve positions and identify the fitted guides

The current valve information specifies four intake valves and two exhaust valves for a complete replacement on the compatible CB450 engine. Its intake-position seals are also sold individually. Guide clips are separate choices rather than automatic additions to every replacement guide.

Parts to consider

Honda CB400 / CB450 Intake Valve ~ Replaces 14711-235-010 Individually supplied intake valveThe valve replaces 14711-235-010. One is supplied; four replace every intake valve in the compatible CB450 engine, with two intake valves specified per cylinder.View part Honda CB400 / CB450 Exhaust Valve ~ Replaces 14721-413-000 Individually supplied exhaust valveThe replacement references 14721-413-000. One is supplied; two replace every exhaust valve in the compatible engine, with one exhaust valve specified per cylinder.View part Honda CB400 / CB450 / CB125 Valve Stem Seal Separate intake-position stem sealSold each with references 12208-413-003, 12209-KL4-005 and 12209-428-003. The CB450 application specifies four at the intake valves and a different seal specification for the exhaust valves.View part

Related parts: Single stock-style valve-guide clip

Assess the head before choosing replacement valves

The valve information calls for measuring stem-to-guide clearance and inspecting the seat and spring. A new valve alone does not correct a worn guide or damaged seat. Establish which components need renewal before calculating the intake and exhaust quantities for the order.

Let the guide design determine the retaining piece

The 12211-250-310 clip is supplied singly for a compatible stock-style guide. Some performance replacement guides have an integral machined shoulder and must not use a separate clip. Check the guide maker’s instructions before adding clips to a cylinder-head parts list.

Valvetrain Parts buying questions

How do I calculate the intake and exhaust valve quantities?

Each valve is sold individually. The compatible CB450 engine uses four intake valves referencing 14711-235-010 and two exhaust valves referencing 14721-413-000 for complete replacement. Count the positions being renewed if the work is limited to part of the head.

Does the offered stem seal cover both intake and exhaust positions?

For the listed CB450 engine, this seal is used at four intake valves and is sold individually. The two exhaust valves require a different specification. Confirm the exhaust replacement separately when servicing all valve positions.

When should I order the separate valve-guide clip?

Choose the single 12211-250-310 clip for a compatible stock-style guide that requires it. Some performance guides use an integral machined shoulder and must not have a separate clip. Identify the installed guide design and follow its manufacturer’s instructions.

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