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1982 Honda CB450SC Nighthawk Exhaust Gasket Selection

An exhaust seal order for your 1982 CB450SC Nighthawk starts at the leaking connection. The available port, headpipe-joint and crossover gaskets have separate Honda references. Identify the joint first, then choose the appropriate seal and supplied quantity for the work you actually plan.

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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 · Exhaust Buying guide

Identify the connection before selecting its gasket

Port-gasket references differ from the headpipe-joint and crossover references. Use the removed part and the fitted exhaust arrangement to distinguish them. A replacement exhaust can change which seal the connection requires.

Parts to consider

Honda CB Exhaust Headpipe Gasket (Each) ~ Replaces 18212-634-000 Individual exhaust port gasketOne gasket, with Honda references 18212-634-000, 18291-236-000 and 18291-MN4-920. Order the number of port seals required.View part 1978-86 Honda CB450 / CB400 Exhaust Joint Gasket for Headpipe ~ Replaces 18391-413-000 Headpipe joint gasketListed against 18391-413-000 and 18391-413-010 for the CB450SC application. Match the actual headpipe connection.View part Honda CB Exhaust Crossover Gasket ~ Replaces 18392-413-000 Exhaust crossover gasketReferences 18392-413-000 and 18392-MG7-750 identify the crossover replacement. Compare the joint before selecting it.View part

Related parts: Compare the ten-pack of port gaskets

Use the joint name with the replacement reference

Similar-looking exhaust seals can belong at different connections. Keep the port references, headpipe-joint references and crossover references with your repair notes. The descriptions identify those separate applications but do not provide dimensions for matching every altered pipe or custom exhaust connection.

Set quantity from the repair rather than the photograph

The port gasket is sold individually, while its companion pack explicitly contains ten. Those are clear purchase quantities. The joint and crossover descriptions do not give supplied counts, so obtain that detail if a specific number is needed before completing an order.

Exhaust Gasket Selection questions

Which references distinguish the three exhaust sealing locations?

The port gasket lists 18212-634-000, 18291-236-000 and 18291-MN4-920. The headpipe joint lists 18391-413-000/010; the crossover lists 18392-413-000 and 18392-MG7-750. Match the connection being serviced rather than choosing by a similar gasket photograph.

When should I choose the ten-pack instead of individual port gaskets?

Both port-gasket listings use the same Honda replacement references. One supplies a single gasket; the other supplies ten. Count the port seals required for the repair and any intended spares before deciding which package makes sense.

What should change in the selection check if an aftermarket exhaust is fitted?

Identify the actual connection and the seal it requires before using the original-model application. The listings name replacement references but give no universal custom-pipe dimensions. Compare the removed component and exhaust supplier information where the connection has changed.

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