1978 Honda CB750A Valves & Valvetrain Parts

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1969-78 Honda CB750 High Performance Kibblewhite Valve Stem Seal Set

$49.95 USD

Upgrade your valve stem seals with this High-Performance Kibblewhite 100% Viton Valve Stem Seal Set of 8. Made in the USA by Kibblewhite, who...

Honda CB750 / CB400 Valve Stem Seal

$3.50 USD

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...

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Honda CB750A CB750K Honda exhaust valve 14721-300-015

1978 Honda CB750A / CB750K Genuine Honda Exhaust Valve ~ OEM 14721-300-015

$89.95 USD

Upgrade or restore your classic Honda motorcycle with this Genuine Honda Exhaust Valve — precision‑engineered and made in Japan. This authentic OEM part #14721‑300‑015...

Honda CB750 valve rocker arm a 14431-300-030

1969-78 Honda CB750 Valve Rocker Arm A ~ Replaces 14431-300-030

$74.95 USD

Upgrade or restore your classic Honda motorcycle with this Valve Rocker Arm A — high‑quality replacement engineered and made in Japan. This component replaces...

Honda CB750 CB450 CB400 CB360 CB77 valve guide clip 12211-250-310

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

$1.95 USD

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 CB750A CB750K Honda intake valve 14711-300-015

1978 Honda CB750A / CB750K Genuine Honda Intake Valve ~ OEM 14711-300-015

$89.95 USD

Upgrade or restore your classic Honda motorcycle with this Genuine Honda Intake Valve — precision‑engineered and made in Japan. This authentic OEM part #14711‑300‑015...

Honda CB750 valve rocker arm b 14432-300-030

1969-78 Honda CB750 Valve Rocker Arm B ~ Replaces 14432-300-030

$74.95 USD

Upgrade or restore your classic Honda motorcycle with this Valve Rocker Arm B — precision‑engineered and made in Japan. This high‑quality replacement is designed...

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1978 Honda CB750A · Valvetrain Parts Buying guide

Identify valve position and the rocker-arm reference

Identify the fitted head and valve positions before choosing replacements. Review the genuine valves’ storage-condition notes separately from the rocker and stem-seal choices.

Parts to consider

1978 Honda CB750A / CB750K Genuine Honda Intake Valve ~ OEM 14711-300-015

Honda intake valveSold per valve and listed against Honda reference 14711-300-015. The description notes possible age spots from storage; inspect the listing before ordering.View part

1978 Honda CB750A / CB750K Genuine Honda Exhaust Valve ~ OEM 14721-300-015

Honda exhaust valveAn individually sold exhaust valve with reference 14721-300-015. Its description also notes possible storage age spots; keep it distinct from the intake valve.View part

Individual valve stem sealThe listing describes a seal for intake and exhaust guides, sold each. Eight seals are stated per CB750; check for duplicates in any gasket package.View part

Review storage condition before planning the valve job

The genuine-valve descriptions identify unused parts but allow for age spots from storage. Review that condition information and have suitability assessed for the planned head work; new-old-stock wording should not replace inspection.

Compare seal materials independently of gasket-set names

Check what the chosen gasket package already supplies before buying loose stem seals. Keep any material requirement tied to a listing that explicitly states it, rather than extending another product’s Viton specification to the whole order.

Common questions

Can the earlier Hondamatic valve listings be treated as the same replacements?

The featured 1978 intake and exhaust valves use 14711-300-015 and 14721-300-015. The separate 1976–77 valve listings use 14711-300-005 and 14721-300-005. These distinct applications do not establish interchangeability; identify the fitted head and exact valve requirement.

Are the featured valves sold as a set?

Both Honda valve listings say sold per valve. The intake and exhaust products have different references and descriptions. Order according to the inspected head and the positions needing replacement, rather than assuming either listing supplies every valve required.

Are the stem seals in the Athena top-end kit identified as the Kibblewhite Viton set?

The Athena kit itemizes eight valve stem seals but does not identify them as Kibblewhite or state Viton material. The separate Kibblewhite product explicitly supplies eight 100% Viton seals. Treat those as different documented specifications and check for duplicate seals before combining purchases.

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