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1978 Honda CB400TII Hawk II Valvetrain Parts

The Hawk II has a three-valve-per-cylinder head, so valve position and the extent of the repair matter. Choose the exhaust valve, stem seals and guide clips by the work being performed, then inspect the seats and guides before assembly.

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Honda CB750 CB400 valve stem seal 12209-300-000

Honda CB750 / CB400 Valve Stem Seal

$3.50 USD
01-0131
Rebuild your CB750 top end the right way with this Valve Stem Seal, replacing OEM Ref. #12209-300-000 / #12209-300-003 / #12209-300-005 / #12209-300-010. Fits...
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...
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...
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1978 Honda CB400TII Hawk II · Valvetrain Buying guide

Build a position-by-position cylinder-head order

An exhaust valve, its stem seal and a guide retaining clip do different jobs. Match the worn component and count the service positions instead of ordering by a broad valve-parts label.

Parts to consider

Honda CB400 / CB450 Exhaust Valve ~ Replaces 14721-413-000 Exhaust valveReplacement exhaust valve corresponding to reference 14721-413-000 for the CB400TII cylinder head.View part Honda CB750 / CB400 Valve Stem Seal Valve-stem sealIndividual valve-stem seal for the listed Hawk II application. Order the number required by the cylinder-head work.View part Honda CB Valve Guide Clip ~ Replaces 12211-250-310 Valve-guide retaining clipIndividual valve-guide clip replacing reference 12211-250-310; choose the quantity needed for the guides being serviced.View part

Inspect the working surfaces

Replacing a valve is only part of cylinder-head service. The seat and guide must also be assessed for wear and damage. Have the head checked to Honda’s specifications before ordering machining work or assuming that a new valve alone will restore sealing.

Order small parts by position

The seals and guide clips are individual items. Make a position-by-position list and compare it with any gasket-set contents already purchased. This avoids both short orders and duplicate sealing parts when the cylinder head and engine gasket work overlap.

Common questions

Can I replace an exhaust valve without checking the guide?

The valve stem, guide clearance and seat condition should be inspected together. A new valve does not establish that the surrounding parts are serviceable; use the Honda manual or an experienced cylinder-head machinist.

Are the valve-stem seals supplied as an engine set?

No. The featured valve-stem seal is sold individually. Count the positions being serviced and check any other gasket or seal package already on your order before choosing the quantity.

When should I order guide clips?

Order clips when guide service or inspection shows they are required. They are individual retaining parts, so match the guide arrangement and count the affected positions instead of assuming a complete-head pack.

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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