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1984 Honda CB650SC Nighthawk Exhaust Sealing Parts

Exhaust sealing choices for the 1984 Honda CB650SC Nighthawk cover the headpipe ports and crossover connection. Identify which joint is being serviced before ordering, then compare a single port gasket with the ten-pack when deciding how many spares to keep.

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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 Seals Buying guide

Select the gasket for the joint being opened

The port gasket and crossover gasket use different replacement references and seal different connections. A clear repair plan helps you choose the correct type first and the useful pack quantity second.

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 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

Related parts: Ten-pack exhaust port gaskets

Start at the leaking or dismantled joint

The port gasket is listed for the CB650SC and supplied individually. The crossover gasket has a separate 1983–85 CB650SC application and different replacement references. Locate the joint being serviced and compare the installed exhaust before ordering, particularly if the motorcycle has a replacement system.

Choose a useful port-gasket quantity

The linked ten-pack contains ten exhaust port gaskets with the same documented references as the single version. Count the port joints you are servicing and decide whether extra stock is useful. Keep the crossover requirement separate rather than treating a bulk port-gasket pack as an exhaust overhaul kit.

Buying questions

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.

What should I check after the exhaust is refitted?

Honda’s Common Service Manual calls for checking the exhaust system for leaks after installation. A new gasket does not by itself confirm a sealed joint; complete that check using the appropriate service procedure before considering the repair finished.

Do these applications cover an aftermarket exhaust automatically?

Check the aftermarket system’s joint design and gasket requirements first. The CB650SC application supports the listed replacement references, but an altered headpipe or crossover arrangement may call for different sealing parts.

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