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1983 Honda CB450SC Nighthawk Exhaust Seal Order Planning

Before ordering exhaust seals for your 1983 CB450SC Nighthawk, make a list of the connections being serviced. Port gaskets have individual and ten-pack options, while the headpipe joint and crossover need separate reference checks. Build the order around those actual locations.

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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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1983 Honda CB450SC Nighthawk · Exhaust Buying guide

Turn the repair location into a specific seal order

A note saying headpipe gasket can leave the required connection unclear. Separate the exhaust-port references from the headpipe-joint and crossover references, then record how many pieces the planned work needs.

Parts to consider

Honda CB Exhaust Headpipe Gasket (Each) ~ Replaces 18212-634-000 Port seal for a specific quantityOne gasket sold each, referencing 18212-634-000, 18291-236-000 and 18291-MN4-920. Set the order quantity from the planned port-seal work.View part 1978-86 Honda CB450 / CB400 Exhaust Joint Gasket for Headpipe ~ Replaces 18391-413-000 Headpipe joint replacementJoint gasket referencing 18391-413-000 and 18391-413-010. Use the fitted connection to confirm that this is the required pipe-joint seal.View part Honda CB Exhaust Crossover Gasket ~ Replaces 18392-413-000 Crossover connection replacementCrossover gasket referencing 18392-413-000 and 18392-MG7-750. Keep this application separate from the headpipe-joint replacement.View part

Related parts: Port-gasket ten-pack for repairs and spares

Resolve an ambiguous gasket description

Match an old parts note to the connection on the motorcycle before completing the order. The port product carries 182-series Honda references; the two pipe-joint products have different 183-series references. Keep the complete number with the location so a short description cannot obscure the required replacement.

Plan quantities one connection at a time

One individual port gasket and the ten-gasket package offer different order quantities for the same reference family. Decide the repair requirement first and add spares deliberately. For headpipe-joint or crossover pieces, confirm the supplied quantity rather than assuming that the motorcycle application describes a complete seal set.

Exhaust Seal Order Planning questions

How do I identify the part when an old note only says headpipe gasket?

First establish whether the note means the exhaust port or a pipe joint. Port replacements use 18212-634-000, 18291-236-000 or 18291-MN4-920; the headpipe-joint replacement uses 18391-413-000/010. Keep the full reference beside the actual connection.

How should I order port gaskets for the repair and a few spares?

Calculate the port seals needed for the work, then add any spares you want to retain. Individual purchases supply one each; the alternative supplies ten. Both products identify the same three Honda replacement references.

Can one pipe-joint gasket choice cover the headpipe joint and crossover?

Choose by the separate applications: 18391-413-000/010 identifies the headpipe joint, while 18392-413-000 and 18392-MG7-750 identify the crossover. Confirm each connection independently; similar sleeve-shaped products do not establish that those replacement references are interchangeable.

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