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1984 Honda CB650SC Nighthawk Steering Bearings & Stem Nut

Steering service for the 1984 Honda CB650SC Nighthawk can involve the bearings, the stem nut or both. Choose the tapered roller conversion by its listed model application, then inspect the existing stem hardware separately before deciding what else the repair requires.

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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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1984 Honda CB650SC Nighthawk · Steering Bearings & Nut Buying guide

Separate bearing renewal from stem hardware

The tapered roller kit includes upper and lower bearing races. The separately sold stem nut uses reference 90304-425-000; matching the installed stem matters if the motorcycle has acquired a different front end.

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.View part Honda CB Steering Stem Nut ~ Replaces 90304-425-000 Steering stem nutSold individually; replaces reference 90304-425-000. The washer is supplied separately.View part

Review the conversion kit as a bearing choice

The Japanese-made tapered roller kit lists the 1983–85 CB650SC and includes upper and lower bearing races. Use its documented contents to plan the bearing repair. Follow the appropriate service information for installation and adjustment rather than assuming the replacement bearing design changes the required checks.

Inspect the nut and washer independently

The stem nut is sold individually and uses reference 90304-425-000; its washer is supplied separately. Inspect the existing hardware before ordering a replacement nut. If the front end is non-original, confirm the actual stem and hardware details rather than using the frame’s model designation as the only check.

Buying 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 order by the bike’s year after a fork swap?

Check the fitted steering stem and bearing arrangement first. These recommendations use the listed CB650SC application; a changed front end can require different bearing and hardware details even though the frame remains a 1984 model.

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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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