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1978 Honda CB400A Suspension & Steering Parts

This suspension selection combines CB400A fork and steering service parts with rear mounting pieces and universal custom shocks. Start with the assembly that needs attention, then check dimensions and mounting requirements carefully before choosing custom shocks for a standard motorcycle.

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Honda motorcycle parts

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Honda CB1000 CB900 CB750 CB550 chrome steering stem nut 90304-415-000

Honda CB Chrome Steering Stem Nut ~ Replaces 90304-415-000

$9.95 USD
49-0786
Replace your steering stem nut with this Chrome Steering Stem Nut, hex nut size 30mm, replacing OEM #90304-415-000.Sold each. We also offer the matching...
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Honda CB750 CB550 CB500 rear shock swingarm bushing 40548-268-000

Honda CB Rear Shock Swingarm Bushing ~ Replaces 40548-268-000

$6.20 USD
28-6918
Rear shock swingarm bushing designed to replace the original Honda component, matching OEM reference 40548-268-000. Fits between the shock and swingarm to provide proper...
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...
Universal chrome shrouded 290mm shock absorber set side detail

Universal Motorcycle Shorty Shock Absorber Set ~ Chrome Shrouded 290mm

$119.95 USD
06-3591
Drop the back end with a clean all-chrome look using this Custom Shorty Shock Absorber Set. Chrome body and shroud with chrome progressive-wound springs,...
Honda CB750 CB650 CB550 CB450 CB400 steering bearing kit (2)

Honda CB Steering Bearing Kit (2)

$69.95 USD
28-2011
Upgrade your steering bearings with this Steering Bearing Kit. Tapered roller steering bearing conversion kit, superior to OEM quality with 10X the contact area...
Honda CB750 CB650 CB550 CB450 CB400 steering bearing kit

Honda CB Steering Bearing Kit

$69.95 USD
28-2011
Upgrade your steering bearings with this Steering Bearing Kit. Tapered roller steering bearing conversion kit, superior to OEM quality with 10X the contact area...
Universal black shrouded 290mm shorty motorcycle shock absorber set

Universal Motorcycle Shorty Shock Absorber Set ~ Black Shrouded 290mm

$129.95 USD
06-3590
Get the shortened look with a bit more coverage using this Custom Shorty Shock Absorber Set featuring a black body and shroud with black...
Honda CB450 CB400 CB360 fork seals

Honda CB450 / CB400 / CB360 Fork Seals

$21.95 USD
27-1019
Replace your CB400 or CB360 fork seals with this Fork Seal Set, 33 x 46 x 11mm. Made in Japan by OEM supplier.Key Features•...
Honda CB450 CB400 CB360 CL360K0 fork dust boot set 91254-413-881

Honda CB Fork Dust Boot Set ~ Replaces 91254-413-881

$15.95 USD
73-0189
Refresh your fork seal dust boots with this Fork Seal Dust Boots Set of 2. 33mm size. Replaces OEM #91254-413-881.Key Features• Fork seal dust...
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Universal black 290mm eye-to-eye shorty motorcycle shock absorber set

Universal Motorcycle Shorty Shock Absorber Set ~ Black Eye-to-Eye 290mm

$139.95 USD
06-3592
Go shorter with a different mounting configuration using this Custom Shorty Shock Absorber Set. Black body and shroud with black progressive-wound springs, 290mm (11...
Honda CB450 CB400 CB350 CB200 swingarm dust seal cap 52144-356-005

Honda CB Swingarm Dust Seal Cap ~ Genuine Honda 52144-356-005 ~ Replaces 52144-356-005

$24.95 USD
99-5170
This genuine Honda swingarm dust seal cap fits at the swingarm pivot / rear fork area on select Honda CB models. It helps cover...
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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...
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Universal black 290mm shorty motorcycle shock absorber set

Universal Motorcycle Shorty Shock Absorber Set ~ Black 290mm

$139.95 USD
06-3589
Slam the back end with this Custom Shorty Shock Absorber Set, measuring 290mm (11 3/8") eye-to-clevis, noticeably shorter than stock for custom café, bobber,...
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1978 Honda CB400A · Suspension & steering Buying guide

Plan the repair around the fork, steering or rear mounts

The fork seals and dust boots have distinct jobs, the steering kit changes the bearing type, and rear suspension fittings serve specific positions. Treat the custom shocks as a separate measured conversion decision.

Parts to consider

Honda CB450 / CB400 / CB360 Fork Seals Fork seal set33 × 46 × 11 mm fork seals made in Japan, with the 1978 CB400A explicitly included in the application.View part Honda CB Steering Bearing Kit Tapered steering bearing kitTapered-roller conversion kit with upper and lower races; made in Japan and listed for the 1978 CB400A.View part Honda CB Swingarm Dust Seal Cap ~ Genuine Honda 52144-356-005 ~ Replaces 52144-356-005 Genuine Honda swingarm dust capGenuine Honda 52144-356-005, sold individually, for the swingarm pivot area. Match the cap to the position being serviced.View part

Related parts: Fork dust boot set · Chrome steering stem nut

Separate fork sealing from steering support

The fork seals measure 33 × 46 × 11 mm; the linked dust boots are a separate set of two 33 mm covers. The tapered steering kit includes upper and lower races. Follow the applicable service instructions for each repair rather than transferring settings between those assemblies.

Inspect rear mounting parts before choosing shocks

The genuine Honda dust cap belongs at the swingarm pivot and is sold individually. Inspect the pivot components separately before planning the repair. If fitting custom shocks, compare length, mounting style, bushing dimensions and clearance rather than assuming a common length establishes the correct fit.

Suspension & steering buying questions

Should I order fork seals and dust boots together?

Inspect both before placing the order. The seals and the exterior dust boots are separate products, so include the boots if they are split or deteriorated. Match the specified dimensions if the front fork has been changed.

Does the steering bearing kit include the stem nut and washer?

The bearing kit specifies upper and lower tapered bearing races. The chrome stem nut and matching washer are separate service products. Assess those existing parts rather than assuming they come with the conversion kit.

Are the 290 mm shocks standard CB400A replacements?

They are universal custom shocks. Select them only after checking the installed mounting arrangement, required length and clearance. The category also contains different lower-mount styles, so a common 290 mm length does not make them interchangeable.

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Send your model and year, plus photos of your existing part and any changes to the original setup.

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