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1985 Honda CB650SC Nighthawk Exhaust Parts

Plan an exhaust sealing repair on your 1985 Nighthawk by identifying the joint you will reopen. Headpipe port gaskets and the crossover gasket serve different locations, while single pieces and ten-packs let you choose the supply quantity for your work.

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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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1985 Honda CB650SC Nighthawk · Exhaust Buying guide

Identify the exhaust joint before choosing a gasket

Choose the port gasket for its engine connection and the crossover gasket for its separate joint. Confirm that the exhaust fitted still uses the corresponding original-style connections.

Parts to consider

Honda CB Exhaust Headpipe Gasket (Each) ~ Replaces 18212-634-000 Single exhaust-port gasketOne gasket per purchase; replacements for the listed Honda exhaust-port references.View part Honda CB Exhaust Crossover Gasket ~ Replaces 18392-413-000 Exhaust crossover gasketSeparate crossover-joint gasket replacing references 18392-413-000 and 18392-MG7-750.View part

Related parts: Ten-pack of exhaust-port gaskets

Count only the joints in the repair

A single port gasket is useful when the work needs individual pieces. The linked ten-pack supplies ten of the port gaskets for a larger order or future service stock. That pack size is a supply quantity, not the number of gaskets used at one connection.

Check the exhaust already installed

Aftermarket headpipes and crossover arrangements can differ from the original system. Inspect the actual joint before choosing a gasket and use the service guidance for assembly. A motorcycle model match should not substitute for checking a changed exhaust connection.

Ordering 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.

Will these gaskets suit an aftermarket exhaust?

Compare its port and crossover connections with the specified replacement applications. An aftermarket system may use a different joint or sealing arrangement, so verify those details before ordering.

Not sure which part you need?

Send your model and year, plus photos of your existing part and any changes to the original setup.

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