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1982 Honda CB450SC Nighthawk Port & Joint Seal References

Choose sealing pieces for a 1982 CB450SC Nighthawk by reference and joint location. This selection offers individual or packed port gaskets and separate headpipe-joint and crossover replacements. Preserve those distinctions when building the order, particularly if earlier work changed the exhaust fitted today.

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Honda motorcycle parts

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Honda CB900 CB650 CB550 exhaust headpipe gasket (each) 18212-634-000

Honda CB Exhaust Headpipe Gasket (Each) ~ Replaces 18212-634-000

$3.58 USD
17-2813
Replace one exhaust port gasket on your CB650, CB400, CB450, or modern CB900F with this Exhaust Port Gasket, 1 piece, replacing OEM #18212-634-000 /...
Honda CB900 CB650 CB550 exhaust headpipe gaskets (pk 10) 18212-634-000

Honda CB Exhaust Headpipe Gaskets ~ (Pk/10) ~ Replaces 18212-634-000

$27.95 USD
17-3813
Stock up on exhaust port gaskets for your CB650, CB400, CB450, or modern CB900F with this 10-pack, replacing OEM #18212-634-000 / #18291-236-000 / #18291-MN4-920.Key...
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Honda CB450 CB400 exhaust joint gasket for headpipe 18391-413-000

1978-86 Honda CB450 / CB400 Exhaust Joint Gasket for Headpipe ~ Replaces 18391-413-000

$10.73 USD
17-4504
Replace your CB400 or CB450 exhaust joint gasket with this Exhaust Joint Gasket for Headpipe, replacing OEM #18391-413-000 / #18391-413-010.Key Features• Exhaust joint gasket...
Honda CB750 CB650 CB550 CB450 exhaust crossover gasket 18392-413-000

Honda CB Exhaust Crossover Gasket ~ Replaces 18392-413-000

$9.95 USD
17-4505
Replace your Nighthawk or CB400/CB450 exhaust crossover gasket with this Exhaust Crossover Gasket, replacing OEM #18392-413-000 / #18392-MG7-750. Fits the mid-'80s CB750SC/CB650SC/CB550SC Nighthawks plus...
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1982 Honda CB450SC Nighthawk · Gaskets & Mounting Hardware Buying guide

Keep the port and pipe-joint references separate

The two port-gasket products share their replacement references and differ in pack size. The headpipe joint and crossover use different references. Confirm each required part independently rather than treating the four listings as one interchangeable gasket choice.

Parts to consider

Honda CB Exhaust Headpipe Gaskets ~ (Pk/10) ~ Replaces 18212-634-000 Ten exhaust port gasketsTen-pack using the same 18212-634-000, 18291-236-000 and 18291-MN4-920 replacement references as the individual port gasket.View part Honda CB Exhaust Headpipe Gasket (Each) ~ Replaces 18212-634-000 One exhaust port gasketSold individually for selecting the exact number of port seals needed. Compare its application with the connection being serviced.View part 1978-86 Honda CB450 / CB400 Exhaust Joint Gasket for Headpipe ~ Replaces 18391-413-000 Separate headpipe-joint sealReferences 18391-413-000 and 18391-413-010. Confirm the fitted headpipe joint before adding this replacement to the order.View part

Related parts: Check the crossover replacement references

Build a location-based seal list

Record the relevant joint beside each reference on your parts list. This keeps the individual and packed port products together while leaving headpipe-joint and crossover seals as separate choices. A known motorcycle application is useful, but it cannot identify a non-original exhaust connection for you.

Confirm the facts that a package description actually supplies

The individual port product supplies one and the pack supplies ten; neither count establishes how many seals your particular repair needs. The joint and crossover products have no explicit supplied count or dimensions in their descriptions. Confirm missing ordering details instead of deriving them from an image.

Port & Joint Seal References questions

Do the individual port gasket and ten-pack use different replacement references?

They both list 18212-634-000, 18291-236-000 and 18291-MN4-920. Their stated difference is quantity: one sold individually or ten per pack. Select the package from the number needed rather than expecting a different sealing application.

How can I tell the headpipe-joint replacement from the crossover replacement?

Use the named connection and Honda reference together. The headpipe joint lists 18391-413-000 and 18391-413-010; the crossover lists 18392-413-000 and 18392-MG7-750. Compare the removed seal and fitted pipe arrangement before choosing between them.

What ordering details should I confirm for joint and crossover seals?

The joint and crossover descriptions do not state dimensions or a supplied count. Use their replacement references to identify the application, then confirm any missing measurements or quantity required for the repair before placing an order.

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Send your model and year, plus photos of your existing part and any changes to the original setup.

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