1984 Honda CB650SC Nighthawk — Joints et fixations
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.
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 /...
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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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...
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.
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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