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1982 Honda CB450SC Nighthawk Engine Gaskets & Oil Seals

Choose sealing parts for the joint opened on your 1982 CB450SC Nighthawk. The Athena valve-cover gasket is a targeted replacement, the tachometer-drive oil seal has a specific width, and the overhaul set needs a contents check against the repair you are planning.

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Currently viewing Gaskets & Oil Seals & Engine Hardware

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Honda CB1100 CB1000 tach drive oil seal 4.8 x 14.5 x 5 91256-425-003

Honda CB Tach Drive Oil Seal ~ 4.8 x 14.5 x 5 ~ Replaces 91256-425-003

$4.95 USD
73-0964
Replace your tach drive oil seal with this Tach Drive Oil Seal, 4.8 x 14.5 x 5, replacing OEM #91256-425-003. High-quality, made in Japan.Key...
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Honda CB450 CB400 valve cover gasket 12328-413-830

1978-86 Honda CB450 / CB400 Valve Cover Gasket ~ Replaces 12328-413-830

$31.95 USD
12-1014
Replace your CB400 or CB450 valve cover gasket with this Athena Brand Valve Cover Gasket, replacing OEM #12328-413-830. Fits the full CB400A/TI/TII/T range plus...
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Honda CB450SC CB450TC Athena overhaul gasket set

1982-86 Honda CB450SC / CB450TC Athena Overhaul Gasket Set

$99.95 USD
18-0104
Rebuild your CB450T or CB450SC engine with this Athena Overhaul Engine Gasket Set. Athena of Italy is an original-equipment supplier to Yamaha, Honda, Kawasaki,...
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1982 Honda CB450SC Nighthawk · Gaskets & Oil Seals Buying guide

Identify the joint before choosing a gasket or seal

The valve-cover gasket and tachometer-drive seal are individually defined replacements for separate locations. The Athena overhaul set offers a broader engine application, but no full contents list is stated. Those differences guide the size and scope of the order.

Parts to consider

1978-86 Honda CB450 / CB400 Valve Cover Gasket ~ Replaces 12328-413-830 Athena main valve-cover gasketOne gasket replaces 12328-413-830 and seals the valve cover. Separate cover-bolt seals and other rubber sealing pieces are not included with this main gasket.View part Honda CB Tach Drive Oil Seal ~ 4.8 x 14.5 x 5 ~ Replaces 91256-425-003 5mm-wide tachometer-drive oil sealOne Japanese-made seal replaces 91256-425-003 and measures 4.8 × 14.5 × 5mm. One is required at the compatible tachometer-drive seal location.View part 1982-86 Honda CB450SC / CB450TC Athena Overhaul Gasket Set Athena engine overhaul gasket setThe application covers the 1982 CB450SC. Confirm the specific gaskets and seals needed for your work because the description does not itemize every supplied piece.View part

Check the small sealing pieces around the cover

The main cover gasket is one purchase. Its product information directs you to inspect the separate washers, grommets or rubber plugs shown for the exact model. Renew damaged or hardened pieces independently instead of assuming a new main gasket supplies the surrounding seals.

Do not choose a shaft seal by diameter alone

The tachometer-drive seal is specified as 4.8 × 14.5 × 5mm. Its width differs from the earlier 4mm seal referenced as 91256-096-651. Match the current drive, removed seal and Honda reference before ordering a replacement that merely looks similar.

Gaskets & Oil Seals buying questions

Which extra sealing pieces should I inspect during valve-cover service?

The Athena product supplies one main gasket referencing 12328-413-830. Inspect the separate sealing washers, grommets or rubber plugs shown for the exact engine. Damaged or hardened pieces need their own replacements; the main gasket does not supply them.

What distinguishes this tach-drive seal from the earlier similar-size seal?

This replacement references 91256-425-003 and measures 4.8 × 14.5 × 5mm. The earlier 91256-096-651 seal is 4mm wide. Compare the removed seal and drive specification, including width, before deciding that the two are interchangeable.

How should I check the overhaul set against the repair I am planning?

The Athena set lists the 1982 CB450SC application, but its description does not enumerate each supplied gasket or seal. List the joints being opened and confirm any essential contents before ordering individual replacements alongside the set.

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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