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1986 Honda CB450SC Nighthawk Exhaust Connection Seals

Identify the connection being renewed on your 1986 CB450SC Nighthawk before choosing an exhaust seal. The available parts cover port, headpipe-joint and crossover applications. Honda references separate those locations, while the port gasket offers a choice of purchasing quantity.

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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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1986 Honda CB450SC Nighthawk · Exhaust Buying guide

Use connection location to narrow the replacement reference

The port gasket comes as one piece or a ten-pack. The headpipe-joint and crossover gaskets have different replacement references and no stated package quantities. All three applications include this model year, but changed pipework needs comparison with the actual sealing connection.

Parts to consider

Honda CB Exhaust Headpipe Gasket (Each) ~ Replaces 18212-634-000 Port gasket for a small orderOne piece sold individually, replacing 18212-634-000, 18291-236-000 and 18291-MN4-920. Suitable for matching the port application before choosing how many to order.View part 1978-86 Honda CB450 / CB400 Exhaust Joint Gasket for Headpipe ~ Replaces 18391-413-000 Headpipe joint replacement sealCompare Honda 18391-413-000 or 18391-413-010 for the headpipe joint. Confirm the seal dimensions and contents supplied when planning the repair.View part Honda CB Exhaust Crossover Gasket ~ Replaces 18392-413-000 Crossover replacement sealCompare Honda 18392-413-000 or 18392-MG7-750 for the crossover connection. Its application remains separate from the headpipe-joint gasket despite a similar sleeve shape.View part

Related parts: Ten-pack of port gaskets with the same replacement references as the individual item.

Prepare a seal list by connection

Keep the replacement references beside each connection in the repair plan. The three port references identify one offered port-gasket application; the headpipe-joint and crossover references identify their own seals. This avoids treating visually similar pieces as replacements for the same location.

Use the actual exhaust when the pipework has changed

A model-year application is a starting point for the listed replacement, rather than a measurement of an aftermarket joint. Give the supplier the connection location, required seal dimensions and any known reference before ordering. No dimensions are stated for the joint or crossover seals.

Exhaust Connection Seals questions

The old seal carries 18391-413-010. Which offered gasket should I compare?

Compare the headpipe-joint gasket, which lists both 18391-413-010 and 18391-413-000. Check that the repair concerns that headpipe connection. The crossover gasket uses a different reference pair, so the old number should guide the application check.

How should I plan an order containing port seals and pipe-joint seals?

Separate the required quantities by connection. Port gaskets are sold individually or ten per pack, while supplied counts for the headpipe-joint and crossover seals are unstated. Confirm those contents before translating the repair list into order quantities.

What details help assess a replacement after an aftermarket exhaust has been fitted?

Describe the sealing location and provide the dimensions required by the installed joint, together with any original Honda reference. The listed year application does not establish altered pipe dimensions. Obtain a size confirmation before choosing the joint or crossover gasket.

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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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