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1983 Honda CB450SC Nighthawk Sealing Joint Parts

For a sealing repair on the 1983 CB450SC Nighthawk, identify the joint and examine the removed part. A main valve-cover gasket has a stated reference and quantity; the tachometer-drive seal also has a critical width. The Athena overhaul set is another option when several engine joints will be opened.

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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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1983 Honda CB450SC Nighthawk · Gaskets & Oil Seals Buying guide

Choose by the joint and the removed part

Use the cover gasket’s 12328-413-830 reference and the tach seal’s 91256-425-003 reference to narrow the order. The overhaul set lists this motorcycle but has no written inventory of supplied pieces. Its application is useful evidence; its photograph is not a guaranteed contents schedule.

Parts to consider

Honda CB Tach Drive Oil Seal ~ 4.8 x 14.5 x 5 ~ Replaces 91256-425-003 Tach-drive seal with a 5mm widthThe Japan-made 91256-425-003 replacement measures 4.8 × 14.5 × 5mm. One is supplied for the specified location. Compare width as well as diameter when inspecting the old seal.View part 1978-86 Honda CB450 / CB400 Valve Cover Gasket ~ Replaces 12328-413-830 Main gasket for the valve coverAthena supplies one gasket replacing 12328-413-830, enough for the main cover joint on one compatible engine. Cover bolt sealing pieces and rubber plugs are not established as part of this package.View part 1982-86 Honda CB450SC / CB450TC Athena Overhaul Gasket Set Athena overhaul gasket selectionThe stated 1982–86 CB450SC application includes this year. Before buying for multiple opened joints, obtain confirmation of the particular gaskets and seals on your repair list; no itemized list is provided.View part

Check the cause as well as the replacement seal

At the tachometer drive, the seal information calls for checking shaft play, wear grooves, crankcase pressure and a blocked breather. Those checks matter when a previous seal has leaked. Follow the Honda procedure for the new seal’s direction and installation rather than selecting it by appearance.

Keep the cover’s smaller sealing pieces visible

The main gasket does not settle the condition of separate washers, grommets or rubber plugs shown for the exact model. Inspect those pieces while planning the cover repair, then use their own references and condition to decide whether additional parts are needed.

Gaskets & Oil Seals ordering questions

How do I avoid confusing this tach seal with the earlier narrow version?

Compare the Honda reference and all three dimensions, including width. This seal replaces 91256-425-003 and is 5mm wide; the earlier 91256-096-651 version is 4mm wide. Similar-looking diameters do not establish the correct replacement for your fitted drive.

What should be checked before ordering another seal for a recurring tach-drive leak?

Inspect the drive for shaft play and wear grooves, and check crankcase pressure or a blocked breather as the seal information advises. Correct an identified cause before fitting another seal; the replacement alone does not establish that the surrounding parts are sound.

Which cover sealing pieces need a separate purchase decision?

The main Athena gasket is supplied separately from the cover’s other sealing pieces. Inspect the washers, grommets and rubber plugs specified for your exact model, then replace hardened or damaged pieces independently. Do not infer their inclusion from the gasket photograph.

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