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.
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...
1978 Honda CB400A Motorcycle Parts1978 Honda CB400TI Motorcycle Parts1978 Honda CB400TII Motorcycle Parts1979 Honda CB400TIIZ Motorcycle Parts1979 Honda CB400TIZ Motorcycle Parts1980 Honda CB400TA Motorcycle Parts1981 Honda CB400TB Motorcycle Parts1982 Honda CB450SC Nighthawk Motorcycle Parts1982 Honda CB450T Hawk Motorcycle Parts1983 Honda CB450SC Nighthawk Motorcycle Parts1983 Honda CB550SC Nighthawk Motorcycle Parts1983 Honda CB650SC Nighthawk Motorcycle Parts1984 Honda CB650SC Nighthawk Motorcycle Parts1984 Honda CB750SC Motorcycle Parts1985 Honda CB450SC Nighthawk Motorcycle Parts1985 Honda CB650SC Nighthawk Motorcycle Parts1985 Honda CB750SC Motorcycle Parts1986 Honda CB450SC Nighthawk Motorcycle PartsHonda CB Exhaust Gaskets & Mounting HardwareHonda CB Exhaust Systems, Mufflers & HardwareHonda CB400 Motorcycle Parts by Model & YearHonda CB400T Hawk Motorcycle Parts (1978–1981)Honda CB450 Motorcycle Parts by Model & YearHonda CB450SC Nighthawk Motorcycle Parts (1982–1986)Honda CB550 Motorcycle Parts by Model & YearHonda CB550SC Nighthawk Motorcycle Parts (1983–1984)Honda CB650 Motorcycle Parts by Model & YearHonda CB650SC Nighthawk Motorcycle Parts (1982–1985)Honda CB750 Motorcycle Parts by Model & YearHonda CB750SC Nighthawk Motorcycle Parts (1982–1986)Series 3: CB700-750SC (82-86)Series 5: CB650 (79-82)Series 6: CB500-CB550 (71-78)Series 7: CB400-CB450 (65-86)
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...
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.
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.
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