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1983 Honda CB650SC Nighthawk — Composants et amortisseurs de direction

The 1983 CB650SC steering selection pairs a tapered-bearing conversion with separately listed stem hardware. Identify the steering assembly fitted to the motorcycle, then compare the bearing kit, nut and washer required for the work. The nut does not include its matching washer.

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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...
Honda CB1100 CB1000 CB900 CB750 steering stem washer 90503-425-000

Honda CB Steering Stem Washer ~ Replaces 90503-425-000

$5.80 USD
73-1127
Complete your steering assembly with this OEM-spec Steering Stem Washer, engineered for secure and precise fitment. A vital component when servicing or rebuilding your...
Honda CB1100 CB1000 CB900 CB750 CB700 steering stem nut 90304-425-000

Honda CB Steering Stem Nut ~ Replaces 90304-425-000

$8.95 USD
73-1128
Ensure your front end stays tight and aligned with this high-quality Steering Stem Nut. Designed to match the factory OEM specifications, this nut is...
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1983 Honda CB650SC Nighthawk · Steering Bearings & Hardware Buying guide

Plan bearings and stem hardware as separate items

The conversion kit includes upper and lower tapered bearing races. The stem nut and washer have separate references and are sold individually, so inspect the existing hardware before adding them.

Parts to consider

Honda CB Steering Bearing Kit Tapered steering bearing kitJapanese-made tapered-roller conversion kit supplying upper and lower bearings with matching races for one steering head.Voir la pièce Honda CB Steering Stem Nut ~ Replaces 90304-425-000 Steering stem nutIndividual stem nut replacing reference 90304-425-000; matching washer is separate.Voir la pièce Honda CB Steering Stem Washer ~ Replaces 90503-425-000 Steering stem washerSeparate steel stem washer replacing reference 90503-425-000; sold individually.Voir la pièce

A conversion kit changes bearing type

The Japanese-made kit is described as a tapered-roller steering-bearing conversion with upper and lower races. Compare its application with the installed front end and follow the appropriate fitting and adjustment guidance. Do not substitute an assumed bearing preload or installation method.

Nut and washer are separate purchases

The stem nut replaces reference 90304-425-000. Its matching washer replaces 90503-425-000 and is separately sold. Inspect both pieces before ordering; a bearing replacement does not automatically require replacing sound external hardware.

Steering Bearings & Hardware questions

Does tightening the upper stem nut set the bearing adjustment?

The stem-nut guidance calls for setting bearing preload by the correct service procedure first, then fitting the correct washer and tightening the upper nut without disturbing that adjustment. Check for smooth steering with no notchiness, binding or play afterward; extra top-nut tightening is not a substitute for diagnosis.

Can an ordinary washer substitute if its hole fits the stem?

The specified washer’s thickness and seating surface affect the upper hardware’s clamping. Compare the original arrangement and reference 90503-425-000 rather than choosing by hole diameter alone. The matching nut and washer are separately supplied, so inspect both during steering service.

Can I rely on the model year after a front-end swap?

A changed steering stem or front end needs its own fitment check. Identify the actual bearings, stem and frame interfaces before selecting the conversion or hardware.

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