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1986 Honda CB450SC Nighthawk Exhaust Gasket Order Planning

Build the gasket order for your 1986 Nighthawk around the reference on the old part and the quantities needed. The port choices differ in pack size, while the other seals address separate joints. Confirm missing contents information before ordering several replacements.

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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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1986 Honda CB450SC Nighthawk · Gaskets & Mounting Hardware Buying guide

Choose quantities after matching the old gasket reference

The individual and ten-pack port gaskets share three Honda references. Headpipe-joint replacements use 18391-413-000 or 18391-413-010; crossover replacements use 18392-413-000 or 18392-MG7-750. Their package counts and measurements are not given, so a multi-seal order needs those details confirmed separately.

Parts to consider

Honda CB Exhaust Headpipe Gaskets ~ (Pk/10) ~ Replaces 18212-634-000 Port gasket pack with ten piecesTen port gaskets per pack, carrying Honda 18212-634-000, 18291-236-000 and 18291-MN4-920 replacement references. Compare the repair requirement and any planned spares.View part 1978-86 Honda CB450 / CB400 Exhaust Joint Gasket for Headpipe ~ Replaces 18391-413-000 Seal for the headpipe jointThe replacement reference pair is 18391-413-000 and 18391-413-010. One offered product option gives no selectable size or explicit supplied count.View part Honda CB Exhaust Crossover Gasket ~ Replaces 18392-413-000 Seal for the crossover jointThe replacement reference pair is 18392-413-000 and 18392-MG7-750. Check the actual connection and clarify contents before multiplying the order quantity.View part

Related parts: Individual port gasket for an order that does not require the ten-pack quantity.

Use the pack size for the matching port application

Both port-gasket offers list the same Honda references and the 1986 CB450SC application. Decide how many matching port seals the work requires before selecting a purchasing quantity. The ten-pack quantity applies to port gaskets; pipe-joint requirements belong on their own order lines.

Clarify what each pipe-joint item supplies

A single product option does not state how many seals arrive in the package. Ask for the headpipe-joint or crossover contents and the relevant dimensions when those details determine the order. Neither listing supplies a complete motorcycle quantity or a choice of alternate dimensions.

Exhaust Gasket Order Planning questions

How do I check an old 18291-MN4-920 port gasket against the available packages?

Both port offers list 18291-MN4-920 alongside 18212-634-000 and 18291-236-000. Match that application first, then choose one-piece supply or ten per pack according to the number of port seals and spares you actually intend to buy.

What needs confirming when the repair requires several headpipe-joint seals?

Ask how many headpipe-joint gaskets are supplied per item before setting the order quantity. The listing identifies 18391-413-000 and 18391-413-010 but gives no package count. Also obtain dimensions if the fitted pipe connection needs a size comparison.

Which crossover replacement should I check against an old 18392-MG7-750 reference?

The crossover gasket lists 18392-MG7-750 and 18392-413-000 as its replacement references. Compare the installed crossover connection, then confirm its required dimensions and the supplied count. Those details remain separate from the references and contents of the headpipe-joint item.

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