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1983 Honda CB650SC Nighthawk Exhaust Sealing Parts

The current 1983 CB650SC exhaust selection focuses on sealing joints. An exhaust port gasket and a crossover gasket fit different locations, and port gaskets are offered individually or in a ten-pack. Inspect the fitted exhaust and identify each disturbed joint before ordering.

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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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1983 Honda CB650SC Nighthawk · Exhaust Sealing Parts Buying guide

Choose the gasket for the exhaust joint

Port and crossover gaskets are distinct shapes and applications. Match the actual joint, especially on a motorcycle with changed pipes, then decide the quantity needed for the work.

Parts to consider

Honda CB Exhaust Headpipe Gasket (Each) ~ Replaces 18212-634-000 Individual exhaust port gasketOne exhaust port gasket per item; reference 18212-634-000.View part Honda CB Exhaust Crossover Gasket ~ Replaces 18392-413-000 Exhaust crossover gasketCrossover-joint gasket replacing references 18392-413-000 and 18392-MG7-750.View part

Related parts: Ten exhaust port gaskets

Port gaskets follow the number of joints

The individual port gasket is sold as one piece. A linked ten-pack uses the same replacement references. Count the ports being disturbed and choose the package that suits your repair or spare-parts needs; a bulk pack is not a model-specific complete exhaust kit.

Crossover sealing is a separate choice

The crossover gasket replaces references 18392-413-000 and 18392-MG7-750. Compare the joint in the fitted system before selecting it. Use the appropriate exhaust service procedure and inspect the adjoining pipe surfaces and hardware during the repair.

Exhaust Sealing Parts 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 automatically fit aftermarket exhaust pipes?

The model application does not verify every replacement system. Compare the aftermarket pipe maker’s joint requirements and dimensions before choosing the port 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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