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1973 Honda CB500K Fork Sealing, Boots & Retainers

Fork parts for the 1973 CB500K include internal seals and clips as well as external boots and reflector fittings. Identify the position being repaired before ordering. The top bolt supplies its own O-ring, while a seal pair and boot pair serve different fork locations.

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Currently viewing Fork Tubes, Springs, Seals & Boots

Honda motorcycle parts

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Honda CB750 CB650 CB550 CB500 fork seals

Honda CB750 / CB650 / CB550 / CB500 Fork Seals

$19.95 USD
27-1007
Replace your fork seals with this Fork Seal Set, 35 x 48 x 10.5 / 11mm. High quality, made in Japan. Key Features• Fork...
Honda CB750 CB550 CB500 CB450 fork gaiters 51611-300-000

Honda CB Stock Type Fork Gaitors ~ Replaces 51611-300-000

$29.95 USD
27-1061
Replace your fork gaitors with this Black Stock Type Fork Gaitors Set of 2, replacing OEM #51611-300-000.Key Features• Stock-type black fork gaitors, set of...
Honda CB750 CB550 CB500 CB450 CB400 reflector 33741-340-670

Honda CB Stock Type Reflector ~ Replaces 33741-340-670

$21.46 USD
11-2303
Restore your mid-'70s Honda's stock reflectors with this Stock-Type Screw-On Reflector with a 6mm thread, replacing OEM #33741-340-670. Broad fitment covering the 1972-78 CB750...
Honda CB750 CB550 CB500 CB450 CL450K5 fork internal circlip set 94521-48000

Honda CB Fork Internal Circlip Set

$7.95 USD
73-1035
Replace your fork internal circlips with this Fork Internal Circlip (48mm) Set of 2, replacing OEM #94521-48000.Key Features• Fork internal circlips• 48mm• Set of...
Honda CB750 CB550 front reflector rubber base 33743-341-670

Honda CB Stock Type Front Reflector Rubber Base ~ Replaces 33743-341-670

$8.95 USD
11-2304
Fit the rubber base beneath your stock front reflector with this Stock-Type Front Reflector Rubber Base, replacing OEM #33743-341-670.Key Features• Stock-type front reflector rubber...
Honda CB750 CB550 CB500 CB450 CL450K5 fork gaiters 51611-300-000

Honda CB Fork Gaitors ~ Replaces 51611-300-000

$29.95 USD
27-1089
Replace your fork gaitors with this Black Fork Gaitors Set of 2, replacing OEM #51611-300-000.Note: these are about 1.75" shorter than the stock type...
Honda CB500K CB450K CL450K5 front fork tube cap bolt with o-ring 90123-323-010

1971-74 Honda CB500K / CB450K / CL450K5 Front Fork Tube Cap Bolt with O-Ring ~ Replaces Honda OEM 90123-323-010

$23.85 USD
29-6019
Replace a damaged, rusted, or rounded front fork tube cap bolt on the Honda CB500K, CB450K, and supported CL450K applications listed below. This aftermarket...
Honda CB750 CB550 CB500 fork boot collars joker machine

Honda CB750 / CB550 / CB500 Fork Boot Collars ~ Joker Machine

$99.95 USD
12-0072
Get a café look while keeping your OEM fork gaiters with these Joker Machine Custom Fully CNC Machined Fork Boot Collars, set of 2....
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1973 Honda CB500K · Fork Tubes, Springs, Seals & Boots Buying guide

Identify the sealing or retaining position before choosing parts

The fork seal set specifies 35 × 48 × 10.5/11mm, and the internal clip pair specifies 48mm. Cap bolts, gaiters and reflector bases have separate applications and contents; inspect each worn part against its reference.

Parts to consider

Honda CB750 / CB650 / CB550 / CB500 Fork Seals Japanese-made fork seal pairTwo seals with dimensions 35 × 48 × 10.5/11mm. The full application expressly names CB500K2 1973; verify the installed forks when parts have been changed.View part 1971-74 Honda CB500K / CB450K / CL450K5 Front Fork Tube Cap Bolt with O-Ring ~ Replaces Honda OEM 90123-323-010 Fork top bolt with O-ringOne cap bolt and its O-ring, referencing 90123-323-010 and expressly listing CB500K2 1973. Two cap bolts are required when replacing both fork tops.View part Honda CB Stock Type Fork Gaitors ~ Replaces 51611-300-000 Stock-type black boot pairTwo accordion fork gaiters referencing 51611-300-000. Check their attachment points against the fitted headlight ears and fork arrangement.View part

Related parts: Pair of 48mm retaining clips · 6mm screw-on reflector · Individual front reflector base

Do not confuse two different sealing locations

One top bolt includes its own O-ring and is individually supplied; two bolts are needed to replace both fork tops. The separate seal set supplies two size-specific seals for the fork legs. Compare the actual leaking or damaged position before treating an O-ring and a fork oil seal as the same repair.

Check external boots and fittings independently

The stock-type gaiter pair references 51611-300-000. A different pair is described as about 1.75 inches shorter, so read the actual boot description. The screw-on reflector has a 6mm thread, while its rubber base is another individual product; neither fitting is stated as included with the boots.

Questions before choosing

How many seals are included, and what profile must match?

Two Japanese-made seals are supplied at 35 × 48 × 10.5/11mm for both compatible fork legs. The complete dimensions matter after a fork swap; the 1973 CB500K name alone does not verify the changed assembly.

Which boot pair matches the original-length fork appearance?

Choose the stock-type 51611-300-000 replacement pair for stock length. The alternate black gaiter pair uses the same reference but is approximately 1.75 inches shorter; both supply two boots, so length is the distinction.

Does one top-bolt order replace both fork tops?

One 90123-323-010 bolt and O-ring are included. Both fork tops require two bolts, while the separate 48mm 94521-48000 retaining clips are packaged as a two-piece set. Count these differently when ordering for both legs.

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