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1984 Honda CB650SC Nighthawk Exhaust Port & Crossover Gaskets

When ordering exhaust gaskets for the 1984 Honda CB650SC Nighthawk, make two decisions: which connection needs resealing and how many port gaskets you want on hand. The individual and ten-pack port choices share their listed references; the crossover uses a separate gasket.

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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...
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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1984 Honda CB650SC Nighthawk · Exhaust Gaskets Buying guide

Keep port and crossover references with their own joints

The single and ten-pack options are port gaskets. The crossover seal is a separate product with its own references and application range, so identify the sealing location before choosing the package quantity.

Parts to consider

Honda CB Exhaust Headpipe Gasket (Each) ~ Replaces 18212-634-000 Single exhaust port gasketOne gasket per item; references 18212-634-000, 18291-236-000 and 18291-MN4-920. Listed for the 1982–85 CB650SC.View part Honda CB Exhaust Headpipe Gaskets ~ (Pk/10) ~ Replaces 18212-634-000 Ten-pack exhaust port gasketsTen exhaust port gaskets per pack, with the same listed references and CB650SC application as the single gasket.View part Honda CB Exhaust Crossover Gasket ~ Replaces 18392-413-000 Exhaust crossover gasketListed for the 1983–85 CB650SC Nighthawk; references 18392-413-000 and 18392-MG7-750.View part

Compare the port-gasket purchase formats

Gasket 17-2813 supplies one port gasket; pack 17-3813 supplies ten. Both list 18212-634-000, 18291-236-000 and 18291-MN4-920. Choose the quantity for the planned work while keeping any crossover seal as a separate purchase.

Identify the crossover seal by its own reference family

Crossover gasket 17-4505 lists 18392-413-000 and 18392-MG7-750. Keep these references separate from the port-gasket numbers when identifying the fitted connection and preparing the order.

Buying questions

Does shared port-gasket coverage mean the crossover gasket fits every CB650SC year?

No broader coverage is established by that shared port gasket. The port-gasket records list 1982–85 CB650SC, while the crossover record lists 1983–85 CB650SC. Check each product’s detailed application rather than transferring one component’s year range to another.

How can I check the crossover seal for an aftermarket exhaust with no Honda reference?

Identify the exhaust system and obtain its required gasket specification. The crossover record gives Honda replacement references but no dimensions for checking an unidentified joint, so the motorcycle’s model alone does not establish a match.

Can I reuse a port gasket after removing the headpipe?

Honda’s Common Service Manual calls for a new exhaust-pipe gasket whenever the pipe is removed from the engine. Include a replacement for each opened port connection and use the model-specific manual for assembly and tightening.

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