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1973 Honda CB500K Four — Composants et amortisseurs de direction

For steering-area hardware on a 1973 CB500K, identify the central stem position separately from the two upper fork clamps. A black Joker Machine nut, central chrome washer and top-bridge washer pair are different products. Their references and positions matter more than a matching finish.

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Honda CB750 CB550 CB500 CB450 CB400 fork cap o-ring (set 2) 94608-50000

Honda CB Fork Cap O-Ring (Set/2)

$2.95 USD
49-0790
Replace your fork cap O-rings with this Fork Cap O-Ring Set of 2, replacing OEM #94608-50000 (qty 2).Key Features• Fork cap O-rings• Set of...
Honda CB750 CB550 front fork top bridge triple tree washer kit 53235-300-000

Honda CB Front Fork Top Bridge / Triple Tree Washer Kit ~ Replaces 53235-300-000

$12.50 USD
73-0833
Avoid broken triple trees with this Front Fork Top Bridge / Triple Tree Washer Kit of 2 washers. These washers are needed in order...
Honda CB1000 CB900 CB750 CB550 steering stem washer 90503-283-000

Honda CB Steering Stem Washer ~ Replaces 90503-283-000

$3.50 USD
49-0787
Replace your steering stem washer with this Chrome Steering Stem Washer, replacing OEM #90503-283-000.Sold each, order the quantity you require.Key Features• Chrome steering stem...
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Honda CB750 CB550 black steering stem nut joker machine 90304-415-000

Honda CB Black Steering Stem Nut ~ Joker Machine ~ Replaces 90304-415-000

$47.95 USD
12-0073
Dress up your steering stem with this Joker Machine Black Steering Stem Nut, 30mm hex, replacing OEM #90304-415-000. High-quality CNC-machined and made in the...
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 · Steering Hardware & Dampers Buying guide

Select central stem hardware separately from clamp washers

The black stem nut lists a 30mm hex and reference 90304-415-000. The central washer and two upper-clamp washers have their own Honda references. Check the original hardware and bridge condition before ordering replacements.

Parts to consider

Honda CB Black Steering Stem Nut ~ Joker Machine ~ Replaces 90304-415-000 Black Joker Machine stem nutUSA-made CNC-machined steering-stem nut referencing 90304-415-000. The listed 30mm dimension describes its hex; compare the original stem and separately listed washer.Voir la pièce Honda CB Steering Stem Washer ~ Replaces 90503-283-000 Individual central stem washerOne chrome washer referencing 90503-283-000 for the central steering-stem hardware. Keep its position distinct from the two-piece upper fork-clamp washer kit.Voir la pièce Honda CB Front Fork Top Bridge / Triple Tree Washer Kit ~ Replaces 53235-300-000 Two fork top-bridge washersPair of clamp-position washers referencing 53235-300-000. The source identifies two compatible fork-tube clamp positions; these differ from the central steering-stem washer.Voir la pièce

Use the nut reference rather than color as the fitment check

The CNC-machined black Joker Machine nut is made in the USA and lists CB500K 1971–73 in its application. Its reference is 90304-415-000 and its hex is 30mm. Compare the fitted stem and retaining arrangement; the hex dimension alone does not establish a thread specification or washer requirement.

A new washer does not repair a damaged bridge

The clamp washer pair references 53235-300-000 and supplies two pieces for the compatible upper fork-clamp positions. The source calls for inspecting bridge and clamp threads and warns that a cracked or distorted bridge remains unserviceable. Assess the surrounding assembly before treating new washers as a repair for damaged metal.

Questions before choosing

Does the black nut’s 30mm hex establish thread compatibility?

The 30mm figure is the wrench hex. The Joker Machine nut replaces 90304-415-000 and lists the 1973 CB500K, but no thread size or pitch is stated; identify a swapped stem’s requirements before choosing it.

Is the stem washer part of the black nut package?

The 90503-283-000 central washer is a separately supplied individual part; the black nut does not state a combined washer package. Check the retained washer, and select it separately when that stem-position piece needs replacement.

Do the two top-bridge washers replace the central washer?

No. The 53235-300-000 pair is for the upper fork-clamp positions, while the single central washer references 90503-283-000. The clamp washers distribute load at the bridge; choose by mounting position instead of package count.

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