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1986 Honda CB450SC Nighthawk Cover Gasket & Drive Seal Choices

Write the seal location next to the original reference when ordering for a 1986 CB450SC Nighthawk. The cover gasket is a main-joint replacement; the tach-drive seal has its own measured specification. A wider overhaul order calls for confirmation of the included pieces instead of extending either separate part’s coverage.

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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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1986 Honda CB450SC Nighthawk · Gaskets & Seals Buying guide

Choose a main gasket or a measured drive seal by location

The Athena cover gasket identifies 12328-413-830 and is supplied singly. The Japan-made tach-drive seal identifies 91256-425-003 at 4.8 × 14.5 × 5 mm. The overhaul set lists CB450SC fitment but leaves individual gasket and seal contents unstated in the written description.

Parts to consider

1978-86 Honda CB450 / CB400 Valve Cover Gasket ~ Replaces 12328-413-830 Athena main valve-cover joint gasketOne 12328-413-830 replacement is included and required per compatible engine. Inspect any separate sealing washers, grommets or plugs specified for that exact cover arrangement.View part Honda CB Tach Drive Oil Seal ~ 4.8 x 14.5 x 5 ~ Replaces 91256-425-003 Single 5 mm wide tach-drive sealThe seal measures 4.8 × 14.5 × 5 mm and replaces 91256-425-003. Compare it with the removed seal, since the earlier 91256-096-651 version has a different 4 mm width.View part 1982-86 Honda CB450SC / CB450TC Athena Overhaul Gasket Set Overhaul set requiring a contents checkAthena’s set lists CB450SC from 1982 through 1986. Ask which individual gaskets and seals are supplied for the work planned; the written description has no item-by-item inventory.View part

Inspect the drive before assuming the lip seal is the only issue

At the tach drive, shaft play or a wear groove can compromise a new seal, and crankcase pressure or a blocked breather can leave leakage unresolved. Include those checks in the assessment before finalizing the repair order. Follow the Honda procedure for seal handling and orientation rather than deriving an installation direction from the photograph.

Confirm auxiliary cover seals independently

The main gasket purchase supplies the main gasket. Where the exact model shows separate sealing washers, grommets or rubber plugs, inspect them for hardening or damage and arrange replacements as required. An overhaul set does not provide written confirmation of those individual pieces simply because several rings appear in its photo.

Gaskets & Seals purchase questions

What must I compare when two tach-drive seals have similar outside diameters?

Compare the Honda reference and the complete dimensions, not the outside diameter alone. This 91256-425-003 seal measures 4.8 × 14.5 × 5 mm; the earlier 91256-096-651 seal has a 4 mm width. Establish which drive arrangement is installed before choosing.

How should I plan the order if the cover’s other sealing rubbers are hardened?

Identify any separate sealing washers, grommets or rubber plugs shown for the exact model and renew damaged pieces independently. The 12328-413-830 listing supplies the main gasket. Record the affected auxiliary pieces rather than assuming their supply with that gasket.

Is there a model option to select within the offered Athena overhaul set?

The offered set has one default product option and lists CB450SC 1982–86 plus CB450T 1982. It provides no separate model-year choice or itemized inventory. Confirm the fitted engine and required contents with the supplier before relying on that application range.

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