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1985 Honda CB450SC Nighthawk Gasket & Oil Seal Matching

Make the leaking or opened location the starting point for sealing work on your 1985 CB450SC Nighthawk. The tach-drive seal has a specific width, the cover gasket seals its own joint, and the overhaul set requires a contents check. Compare those details with the installed engine before building the order.

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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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1985 Honda CB450SC Nighthawk · Gaskets & Oil Seals Buying guide

Record the joint, reference and seal size

The separate tach-drive seal replaces 91256-425-003 at 4.8 × 14.5 × 5 mm; the main cover gasket replaces 12328-413-830. Neither identifier should be substituted for a nearby seal. The broader Athena set lists CB450SC fitment without a written piece-by-piece inventory.

Parts to consider

Honda CB Tach Drive Oil Seal ~ 4.8 x 14.5 x 5 ~ Replaces 91256-425-003 Japan-made tach-drive lip sealThis single seal has the listed 4.8 × 14.5 × 5 mm size and reference 91256-425-003. The earlier 91256-096-651 seal has a different, 4 mm width.View part 1978-86 Honda CB450 / CB400 Valve Cover Gasket ~ Replaces 12328-413-830 Main cover gasket, reference 12328-413-830One Athena gasket is supplied for the main valve-cover joint. Inspect any separate sealing washers, grommets or rubber plugs shown for the exact model and replace damaged pieces independently.View part 1982-86 Honda CB450SC / CB450TC Athena Overhaul Gasket Set Athena gasket set for overhaul workThe Italy-made set lists the CB450SC from 1982 through 1986. Confirm the required sealing pieces with the supplier because the description does not provide an itemized inventory.View part

Check the drive condition as well as the seal

At the tach drive, a replacement seal can still leak if shaft play, a wear groove, excess crankcase pressure or a blocked breather remains. Inspect those conditions while identifying the seal. Use the Honda procedure for the repair; matching the seal dimensions does not resolve an underlying fault.

Keep changed engines in the fitment discussion

An engine replacement or altered cover makes the fitted part’s identity more useful than the frame year alone. Provide the engine details, gasket reference and sealing location when confirming an order. For the overhaul set, also obtain the contents needed for the particular work rather than relying on the layout photograph.

Gaskets & Oil Seals purchase questions

My removed tach seal is 4 mm wide; is this the same replacement?

This seal is 5 mm wide and replaces 91256-425-003. The earlier 91256-096-651 version is 4 mm wide. Confirm the installed drive’s requirement before ordering; a matching outside diameter alone does not establish the correct width or reference.

Which additional cover sealing pieces should I inspect before placing the order?

Inspect any separate sealing washers, grommets or rubber plugs shown for the exact model for hardening or damage. The 12328-413-830 purchase supplies the main gasket, so any affected separate sealing pieces need their own replacement order.

What information helps confirm the overhaul set on a changed engine?

Give the supplier the fitted engine’s identity and the joints you plan to open, then request the matching contents list. The set’s stated CB450SC year range does not identify an unverified replacement engine or enumerate each sealing piece.

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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