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1984 Honda CB650SC Nighthawk Fork Oil & Dust Seals

Fork sealing work on the 1984 Honda CB650SC Nighthawk calls for matching both the oil seal and outer dust seal to the fitted fork. The listed oil-seal dimensions are 39 × 52 × 11 mm, while dust seals come as a documented pair.

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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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1984 Honda CB650SC Nighthawk · Fork Oil & Dust Seals Buying guide

Order the sealing pieces for the fitted forks

The oil seals and dust seals have separate listings and package descriptions. Verify the fork assembly before buying, then plan the oil-seal order and the two-piece dust-seal pack as distinct parts of the service.

Parts to consider

1981-85 Honda CB1100F / CB1000C / CB900F / CB650SC Fork Seal Set 39 × 52 × 11 mm fork sealsFork oil seals made in Japan by an OEM supplier, listed for the 1983–85 CB650SC Nighthawk.View part 1981-85 Honda CB1100F / CB1000C / CB900F / CB650SC Fork Dust Seal Set Fork dust seal pairTwo dust seals per pack, made in Japan, with a listed 1983–85 CB650SC application.View part

Use dimensions alongside the model application

The oil seals are listed for the 1983–85 CB650SC and measure 39 × 52 × 11 mm. Confirm those details against the forks actually installed, because a replacement front end may use different seals. Use the appropriate service manual for the repair procedure and fork specifications.

Inspect dust protection during the same service

The dust-seal package supplies two pieces for the later CB650SC. Inspect those outer seals while assessing the oil leak and fork surfaces. Replace the parts needed for the repair, keeping the dust-seal pair separate from the oil seals and following the correct service instructions.

Buying 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.

Is the oil-seal set confirmed as two pieces?

Yes. The oil-seal set contains two 39 × 52 × 11 mm seals for the listed compatible forks. The dust-seal pair is a separate product; inspect both positions before planning the service order.

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