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1978 Honda CB750K Fork Seals, Tubes & Dust Boots

The 1978 CB750K fork selection includes seals, dust boots, tube sets, springs and smaller internal pieces. Work from the fork assembly actually fitted. Tube measurements and the separate descriptions for sealing and retaining parts help prevent ordering an incomplete or mismatched selection.

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Most orders ship same or next business day Fitment guarantee Listed for your exact model and year? We’ll make it right if it doesn’t fit as described. Mechanic-backed support Ask our team for help choosing the right Honda CB part.
Currently viewing Fork Tubes, Springs, Seals & Boots

Honda motorcycle parts

Choose your model and year to see parts listed for your bike.

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 Progressive type front fork springs

Honda CB750 Progressive Type Front Fork Springs

$89.95 USD
27-1078
Upgrade your CB750 front suspension with this Progressive Type Front Fork Spring Set of 2, including required spacers and washers. Progressive springs improve handling...
Honda CB750 CB650 CB550 CB500 fork seal stopper metal rings (pk 2) 51447-KL4-951

Honda CB750 / CB650 / CB550 / CB500 Fork Seal Stopper Metal Rings (Pk/2) ~ Replaces 51447-KL4-951

$7.95 USD
73-0940
Replace your fork seal stopper metal rings with this Fork Seal Stopper Metal Ring Pk/2, replacing OEM #51447-KL4-951. This is the metal ring above...
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 CB750A CB750F CB750K fork tube set

1972-78 Honda CB750A / CB750F / CB750K Fork Tube Set

$179.95 USD
73-1148
Replace your fork tubes with this Fork Tube Set of 2 for the late-1970s CB750 models.Before ordering please confirm this is the length you...
Honda CB750 CB550 fork dust boot set

1975-78 Honda CB750 / CB550 Fork Dust Boot Set

$24.95 USD
27-1080
Replace your 35mm fork dust boots with this Fork Seal Dust Boot Set of 2 for 35mm fork tubes.Key Features• Fork dust boot set,...
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Honda CB750 CB550 CB500 CB400 headlight stay headlight reflector bolt 90120-377-000

Honda CB750 / CB550 / CB500 / CB400 Headlight Stay / Headlight Reflector Bolt ~ Replaces 90120-377-000

$8.95 USD
99-4977
Upgrade or restore your classic Honda motorcycle headlight system with this Headlight Stay / Headlight Reflector Bolt — designed to secure the headlight reflector...
Honda CB750 CB550 CB500 CB450 35mm front fork tube bolt with o-ring 90123-300-000

Honda CB750 / CB550 / CB500 / CB450 35mm Front Fork Tube Bolt with O-Ring ~ Replaces Honda OEM 90123-300-000

$17.95 USD
29-6013
This aftermarket 35mm front fork tube bolt is used as the top cap/bolt on compatible Honda CB 35mm fork tubes. It replaces Honda OEM...
Honda CB750 CB650 CB550 front fork damper valve set

Honda CB750 / CB650 / CB550 Front Fork Damper Valve Set

$79.95 USD
27-1886
Upgrade your 35mm rod-style front forks to perform like modern cartridge forks with this Front Fork Damper Valve Set of 2. These tunable valves...
Honda CB1100 CB1000 CB900 CB750 16mm clutch oil filter rotor lock nut 90231-KCS-651

Honda CB 16mm Clutch / Oil Filter Rotor Lock Nut ~ Genuine Honda 90231-KCS-651 ~ Replaces 90231-KCS-651

$10.95 USD
99-5383
This genuine Honda 16mm lock nut is used on compatible Honda CB clutch basket and oil filter rotor assemblies. It is a small hardware...
Universal motorcycle fork cap wrench 35mm

Universal Motorcycle Fork Cap Wrench ~ 35mm

$7.00 USD
35-9113
Fork Cap Wrench ~ 35MM Size for custom or restoration work on classic Honda CB motorcycles.  Key Features Aftermarket part Sold as: Each Fitment...
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Honda CB750A CB750F CB750K fork tube set

1972-78 Honda CB750A / CB750F / CB750K Fork Tube Set

$179.95 USD
73-1080
Replace your fork tubes with this Fork Tube Set of 2, length 605mm (23 13/16") with 35mm OD.Note: this length is 23 13/16", one...
Honda CB900 CB750 CB650 CB550 front fork oil lock piece 51432-371-003

Honda CB900 / CB750 / CB650 / CB550 Front Fork Oil Lock Piece ~ Genuine Honda 51432-371-003

$29.95 USD
99-5318
This genuine Honda front fork oil lock piece fits inside the front fork assembly on the Honda CB models listed below. It works with...
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1978 Honda CB750K · Fork Tubes, Springs, Seals & Boots Buying guide

Match tube details and service pieces to the fitted forks

Fork tubes, seals and dust boots are offered as separate products. The internal oil-lock piece and seal stopper rings also have their own references and contents to compare during a service order.

Parts to consider

Honda CB750 / CB650 / CB550 / CB500 Fork Seals Fork seal setListed seal dimensions are 35 × 48 × 10.5 / 11mm; the description includes the 1978 CB750K.View part 1975-78 Honda CB750 / CB550 Fork Dust Boot Set 35mm fork dust bootsTwo dust boots for 35mm fork tubes. These are separately listed from the fork seals.View part 1972-78 Honda CB750A / CB750F / CB750K Fork Tube Set 605mm fork tube setSet of two tubes listed at 605mm long with 35mm outside diameter. Confirm the required length against your forks.View part

Related parts: Fork seal stopper rings · Progressive-type fork spring set · Honda fork oil-lock piece

Read the length note for your own application

The 605mm tube listing includes the 1978 CB750K and asks buyers to confirm the length. Its longer-than-stock wording is qualified for particular applications in the description. Do not carry that wording across every listed model; compare the fitted tube and the full application notes.

Separate service parts from tuning components

The spring set lists spacers and washers, while seals, dust boots and stopper rings are separate items. The damper-valve listing describes additional installation work rather than an ordinary sealing replacement. Choose parts for the intended job and read every package’s contents before planning the service.

Common questions

Is the 605mm tube automatically the length I need?

Its listing includes the 1978 CB750K but expressly asks buyers to confirm the length required. Compare the fitted fork assembly and the full product description. A model match alone does not identify changes made by previous owners.

Are dust boots included with the fork seal set?

The fork seal listing and the dust boot listing are separate products. The dust boots are described as a set of two for 35mm tubes. Check their individual contents before treating a seal purchase as a complete service package.

Is the Honda oil-lock piece a universal fork component?

No. Its description identifies Honda reference 51432-371-003 and instructs buyers to compare the old part and fork diagram. Use that reference and the installed assembly, rather than assuming similar-looking internal fork pieces are interchangeable.

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