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1978 Honda CB400A Steering Bearings & Hardware

The CB400A steering selection covers a tapered-bearing conversion and separate stem hardware. Choose the bearing kit for bearing service, then assess the nut and washer individually. A replacement or modified front end needs its own application check before these original-model references are used.

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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...
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...
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...
Sold out
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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1978 Honda CB400A · Steering bearings & hardware Buying guide

Separate the bearing repair from the stem hardware

The tapered conversion kit, chrome nut and washer serve different parts of the steering assembly. Plan which pieces the repair needs and retain the distinction between a nut’s hex size and its thread.

Parts to consider

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 Chrome Steering Stem Nut ~ Replaces 90304-415-000 Chrome steering stem nutSold individually; 30 mm hex and replacement reference 90304-415-000. The matching washer is a separate product.View part Honda CB Steering Stem Washer ~ Replaces 90503-283-000 Steering stem washerChrome washer referencing 90503-283-000, sold individually and listed for the CB400A.View part

Choose one tapered-bearing kit

The kit is a tapered-roller conversion with upper and lower races, made in Japan and listed for the 1978 CB400A. Have the steering assembly inspected before ordering and use the correct installation guidance. Do not substitute a generic torque or preload setting for the conversion requirements.

Match the stem nut and washer separately

The chrome nut references 90304-415-000 and uses a 30 mm hex. Its matching washer references 90503-283-000; both are sold individually. If the front end has been changed, compare the actual stem and hardware specification rather than assuming the original-model application remains valid.

Steering bearings & hardware buying questions

Does the bearing kit replace the original bearing type?

It is offered as a tapered-roller conversion for the CB400A, with upper and lower tapered races. Check the fitted steering assembly and follow the conversion and service instructions for installation and adjustment.

Is 30 mm the steering stem nut thread size?

No. The product specifies a 30 mm hex, which describes the wrench size. It does not state a thread measurement. Use the replacement reference and the actual stem application when selecting the nut.

Should I buy a new nut and washer with the bearings?

Inspect the existing nut and washer before deciding. They are separate products rather than stated contents of the bearing kit. Order the appropriate hardware if its condition or the planned repair requires replacement.

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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