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1983 Honda CB650SC Nighthawk Fork Oil & Dust Seals

Fork service for the 1983 CB650SC separates oil seals from the outer dust seals. The oil-seal product specifies 39 × 52 × 11mm dimensions, while the dust-seal package explicitly contains two pieces. Confirm the fitted forks before selecting either set.

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Honda CB1100F CB1000C CB900F CB650SC fork seal set

1981-85 Honda CB1100F / CB1000C / CB900F / CB650SC Fork Seal Set

$23.05 USD
27-1029
Replace your big-bore DOHC fork seals with this Fork Seal Set, 39 x 52 x 11mm. Made in Japan by OEM supplier.Key Features• Fork...
Honda CB1100F CB1000C CB900F CB650SC fork dust seal set

1981-85 Honda CB1100F / CB1000C / CB900F / CB650SC Fork Dust Seal Set

$26.23 USD
27-1048
Replace your big-bore DOHC fork dust seals with this Fork Dust Seal Set of 2. OEM-quality parts made in Japan.Key Features• Fork dust seal...
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1983 Honda CB650SC Nighthawk · Fork Oil & Dust Seals Buying guide

Compare oil seals and dust seals separately

The two seal products share a later-CB650SC application but serve different positions. Match the old seals and inspect the fork tubes before ordering replacements for an aged or changed front end.

Parts to consider

1981-85 Honda CB1100F / CB1000C / CB900F / CB650SC Fork Seal Set Fork oil seal set39 × 52 × 11mm fork seals for the listed later CB650SC application; made in Japan.View part 1981-85 Honda CB1100F / CB1000C / CB900F / CB650SC Fork Dust Seal Set Fork dust seal pairTwo fork dust seals for the 1983–85 CB650SC application; made in Japan.View part

Use the measured fork application

The oil seals list the 1983–85 CB650SC and 39 × 52 × 11mm dimensions. A motorcycle fitted with different forks needs the seals for those forks. Compare the removed seal markings and dimensions instead of choosing from the motorcycle year alone.

Dust protection is a separate order

The dust-seal product explicitly supplies two pieces. Inspect the existing dust seals along with the oil seals and fork surfaces. Use the correct service manual for disassembly, fluid requirements and reassembly rather than inferring procedures from the replacement size.

Fork Oil & Dust Seals questions

Can I use the same service instructions for both fork legs?

Honda’s late-CB650SC manual gives different left/right internals and fluid quantities. Follow its side-specific procedure; seal size does not determine the fluid fill.

Can these seals be selected from the Nighthawk name alone?

No. This oil-seal set is 39 × 52 × 11 mm for the listed 1983–85 CB650SC, while the separately listed 1982 CB650SC seal is 37 × 50 × 11 mm. Identify the fitted fork and full seal dimensions; the shared Nighthawk name does not make those sets interchangeable.

Do new seals guarantee a leaking fork is fixed?

The fork tubes, seal seats and other components also need inspection. Have damage or wear assessed before fitting new seals and use the correct service procedure.

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