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1983 Honda CB450SC Nighthawk Valve & Guide Service Parts

Label the intake and exhaust positions before assembling a cylinder-head order for your 1983 CB450SC Nighthawk. These valves are sold individually, and their complete-engine counts differ. Stem seals also need a position check, while the guide clip depends on the design of the guide already fitted.

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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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1983 Honda CB450SC Nighthawk · Valvetrain Buying guide

Count the positions before buying individual parts

The listed CB450 twin uses four intake valves and two exhaust valves. The offered stem seal serves its four intake positions; the exhaust valves require another seal specification. Keep those details separate from the guide-clip decision, particularly if replacement guides have been installed.

Parts to consider

Honda CB400 / CB450 Intake Valve ~ Replaces 14711-235-010 Individual intake valveOne 14711-235-010 replacement is supplied. Two intake valves are used per cylinder on the listed CB450 twin, giving four for an engine-wide replacement. Confirm the position and existing head condition.View part Honda CB400 / CB450 Exhaust Valve ~ Replaces 14721-413-000 Individual exhaust valveThe 14721-413-000 replacement is supplied singly. One exhaust valve is used per cylinder, so two renew both exhaust positions. Intake and exhaust references should remain separate on the order.View part Honda CB400 / CB450 / CB125 Valve Stem Seal Stem seal for the intake positionsOne seal is supplied under the listed 12208-413-003, 12209-KL4-005 and 12209-428-003 references. Four serve the intake positions; the two exhaust valves use a different specification.View part

Related parts: Guide clip for the compatible stock-style design

Inspect the head before deciding the repair scope

The valve information calls for measuring stem-to-guide clearance, inspecting seats and springs, and checking installed height and valve clearance against the Honda manual. A new valve does not correct a worn guide or damaged seat. Let those findings determine whether the parts list needs further head work.

Match a guide clip to the guide itself

The individual 12211-250-310 clip is intended for a compatible stock-style guide. Some performance replacement guides have an integral machined shoulder and must not receive a separate clip. Use the guide maker’s design and instructions when the head has been modified.

Valvetrain ordering questions

How many intake and exhaust valves make up a complete order?

Order four of the listed intake valves and two of the exhaust valves to replace every valve in the compatible CB450 twin. Each product supplies one valve. For a partial repair, count the affected intake and exhaust positions separately.

What head inspections can change the valve order before I buy?

Check stem-to-guide clearance, valve seats and springs, then verify installed height against the Honda manual. A worn guide or damaged seat needs attention alongside the valve, so these findings help establish the repair scope before ordering individual replacements.

How should the seal order be divided between intake and exhaust positions?

The offered seal is sold individually, with four required for the listed CB450 intake positions. Its two exhaust valves use a different seal specification. Confirm that exhaust reference separately rather than ordering six of the intake seal for the engine.

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