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1973 Honda CB500K Engine Maintenance and Overhaul Choices

Before ordering engine parts for a 1973 Honda CB500K, turn the repair into a list of specific components. Oil service, piston replacement and gasket work call for different selections. Check the fitted engine and retained parts before deciding how much to replace.

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Honda motorcycle parts

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Honda CB500K standard size (56 mm) piston kit includes piston, rings, pin and clips

1971-73 Honda CB500K Standard Size (56 mm) Piston Kit ~ Includes Piston, Rings, Pin & Clips

$44.95 USD
99-4871
Upgrade or rebuild your classic Honda motorcycle engine with this Standard Size (56 mm) Piston Kit — complete with piston, piston rings, piston pin, and...
New
Honda CB500K standard size piston ring set 13011-323-014

1971-73 Honda CB500K Standard Size Piston Ring Set ~ Replaces 13011-323-014 / 13011-323-013

$14.95 USD
99-4868
Upgrade or rebuild your classic Honda motorcycle engine with this Standard Size Piston Ring Set — designed to replace OEM #13011‑323‑014 / 13011‑323‑013. This...
Honda CB650 CB550 CB500 CB400 CB350 primary chain 23131-426-003

Honda CB Primary Chain ~ Replaces 23131-426-003

$179.95 USD
73-0162
Replace your CB primary chain with this OEM-Quality Primary Chain, 50 link, replacing OEM #23131-426-003 / #23131-323-003.Key Features• Primary chain, OEM quality• 50 link•...
Honda CB550F CB550K CB500K cylinder head gasket 12251-374-306

1971-78 Honda CB550F / CB550K / CB500K Cylinder Head Gasket ~ Replaces 12251-374-306

$69.95 USD
18-6996
Replace your CB500K or CB550 cylinder head gasket with this Cylinder Head Gasket, replacing OEM #12251-374-306.Key Features• Cylinder head gasket• Replaces OEM #12251-374-306• Honda...
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Honda CB650 CB550 performance kibblewhite valve stem seal set 12209-333-005

Honda CB High Performance Kibblewhite Valve Stem Seal Set ~ Replaces 12209-333-005

$49.95 USD
12-0083
Fit premium Viton valve stem seals with this Kibblewhite 100% Viton Valve Stem Seal Set of 8, replacing OEM #12209-333-005. Made in the USA....
New
Honda CB500K engine oil seal kit with 9 seals

1971-73 Honda CB500K Engine Oil Seal Kit

$27.95 USD
01-9952
Seal up your CB500K engine rebuild with this 9-piece Engine Oil Seal Kit. A complete bundle matched specifically to the 1971-73 CB500K, saving you...
New
Honda CB550 CB500 CB400 CB350 primary drive rubber damper 23114-323-000

Honda CB550 / CB500 / CB400 / CB350 Primary Drive Rubber Damper ~ Genuine Honda 23114-323-000

$12.50 USD
99-5134
This genuine Honda primary drive rubber damper cushions the primary drive assembly inside select classic Honda CB four-cylinder engines. It helps absorb vibration, drivetrain...
New
Honda CB650 CB550 CB500 piston pin 13111-440-000

Honda CB Genuine Honda Piston Pin ~ OEM 13111-440-000 / 13111-286-000

$18.95 USD
99-5321
Upgrade or restore your classic Honda motorcycle with this Genuine Honda Piston Pin — precision‑engineered and made in Japan. This authentic replacement fits and...
Honda CB550F CB550K CB500K CB500 550 cam chain tensioner 14500-323-000

1971-78 Honda CB550F / CB550K / CB500K CB500/550 Cam Chain Tensioner ~ Honda OEM 14500-323-000/010

$319.95 USD
99-5447
Cam chain tensioner designed to match Honda OEM reference 14500-323-010. Keeps proper tension on the cam chain to support consistent valve timing and smooth...
Honda CB750 CB550 drive chain adjuster screws black joker machine 90119-283-000

Honda CB Drive Chain Adjuster Screws ~ Black ~ Joker Machine ~ Replaces 90119-283-000

$59.95 USD
73-1059
Refresh your drive chain adjusters with these Joker Machine Brand Black Custom Type Drive Chain Adjuster Screws, set of 2, with gold-cadmium-plated nuts. Replaces...
Honda CB550F CB550K CB500K cylinder head cover gasket 12391-323-000

1971-78 Honda CB550F / CB550K / CB500K Cylinder Head Cover Gasket ~ Replaces 12391-323-000

$41.95 USD
18-6997
Replace your CB500K or CB550 cylinder head cover gasket with this Cylinder Head Cover Gasket, replacing OEM #12391-323-000.Key Features• Cylinder head cover gasket• Replaces...
Honda CB650 CB550 CB500 cylinder base gasket 12191-426-306

Honda CB650 / CB550 / CB500 Cylinder Base Gasket ~ Replaces 12191-426-306

$18.50 USD
18-6993
Replace your CB650 or CB500/CB550 cylinder base gasket with this Cylinder Base Gasket, replacing OEM #12191-426-306.Key Features• Cylinder base gasket• Replaces OEM #12191-426-306• Honda...
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Honda CB550F CB550K CB500K high performance kibblewhite valve spring set

1971-76 Honda CB550F / CB550K / CB500K High Performance Kibblewhite Valve Spring Set

$109.95 USD
12-0079
Rebuild your CB500 or CB550 top-end with this Kibblewhite High-Performance Valve Spring Set of 8. Made in the USA by Kibblewhite with 75+ years...
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Honda CB550F CB550K CB500K high performance kibblewhite intake exhaust valve guide

1971-77 Honda CB550F / CB550K / CB500K High Performance Kibblewhite Intake/Exhaust Valve Guide

$64.95 USD
12-0082
Fit a premium valve guide to your CB500 or CB550 with this Kibblewhite Intake or Exhaust Valve Guide (standard size). Same C63000 nickel-aluminum bronze...
Honda CB550F CB550K CB500K Athena gasket set (top end set only)

1971-78 Honda CB550F / CB550K / CB500K Athena Gasket Set (Top End Set Only)

$144.95 USD
18-0435
Freshen up the top end of your CB500 or CB550 with this Athena Top End Gasket Set. Athena of Italy is an original-equipment supplier...
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Honda CB500K overhaul gasket set

1971-73 Honda CB500K Overhaul Gasket Set

$129.95 USD
18-0438
Rebuild your CB500K engine with this Overhaul Engine Gasket Set.Key Features• Overhaul engine gasket setFitment / Compatibility• Honda CB500K (1971‑73)Part Number: 18-0438
Honda CB500K Athena overhaul gasket set

1971-73 Honda CB500K Athena Overhaul Gasket Set

$219.00 USD
18-0192
Rebuild your CB500K engine with this Athena Overhaul Engine Gasket Set. Athena of Italy is an original-equipment supplier to Yamaha, Honda, Kawasaki, Suzuki, and...
Honda CB550F CB550K CB500K high performance kibblewhite black diamond intake valve 14711-107-020

1971-78 Honda CB550F / CB550K / CB500K High Performance Kibblewhite Black Diamond Intake Valve

$79.95 USD
12-0080
Upgrade your CB500/CB550 intake with this Kibblewhite Black Diamond Intake Valve, replacing OEM #14711-107-020. Stainless steel valves impregnated by a special German process to...
Honda CB550F CB550K CB500K high performance kibblewhite black diamond exhaust valve 14721-323-005

1971-78 Honda CB550F / CB550K / CB500K High Performance Kibblewhite Black Diamond Exhaust Valve

$79.95 USD
12-0081
Match your CB500/CB550 intake with this Kibblewhite Black Diamond Exhaust Valve, replacing OEM #14721-323-005. Same Black Diamond process as our intake valves: stainless steel...
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1973 Honda CB500K · Engine Buying guide

Start with a component list for your engine

Paper filters, standard piston kits and Athena gasket sets provide different starting points. Their descriptions define separate purchases, so work from the condition and identity of the existing components rather than expecting one order to cover every repair.

Parts to consider

Honda CB Oil Filter ~ Replaces 15410-426-010 Paper element for routine filter serviceOne paper element is supplied for the original-style filter arrangement. The description makes its O-rings, spring and washer separate service parts; compare the retained housing before adding them.View part 1971-73 Honda CB500K Standard Size (56 mm) Piston Kit ~ Includes Piston, Rings, Pin & Clips 56 mm standard piston packageThe package contains one piston, a ring set, a wrist pin and two clips. Four kits replace all four pistons, but cylinder measurements must establish whether standard size suits the engine.View part 1971-73 Honda CB500K Athena Overhaul Gasket Set Athena engine overhaul gasket setThis Athena set lists CB500K 1971–73 fitment. Its description does not enumerate every supplied gasket, so confirm any essential contents instead of treating the overhaul name as a complete engine-parts promise.View part

Related parts: CB500K nine-piece oil-seal kit · Athena top-end-only gasket set · Alternator side-cover gasket

Make the sealing list specific

Write down each opened joint and each shaft location that needs a seal. The nine-piece oil-seal kit expressly contains named oil seals, while the gasket sets address another selection. A cover, its gasket and mounting hardware can also be separate purchases; check the relevant contents before combining them.

Let the cylinder assessment decide piston size

A 56 mm standard piston is an offered size, not a diagnosis of an old engine. Have the actual cylinder and piston assessed, including evidence of previous machining. Then choose between a complete one-piston kit and individual ring or pin replacements that suit the measured assembly.

Buying questions answered

What should I check before choosing a piston kit?

Confirm the actual cylinder measurements and the piston size needed for that cylinder. The offered standard kit is 56 mm and supplies one piston assembly; an old model label cannot confirm an unmodified bore.

Can I combine the oil-seal kit with a gasket set?

They are different products, so compare both descriptions with the repair list. The oil-seal kit names nine seals and expressly leaves cylinder, head, cover and crankcase gaskets plus O-rings as separate sealing parts.

Which oil-service arrangement should I identify before ordering housing parts?

The paper element uses the original filter housing, with its service O-rings, spring and washer available separately. The chrome spin-on conversion replaces that housing, its bolt and the paper element. Identify the fitted system before ordering retained-housing parts.

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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