The exhaust service selection for the 1980 Honda CB650C Custom focuses on port gaskets and mounting studs. Decide how many sealing points you are renewing, then check the stud and flange-nut condition so the order matches the work planned.
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1980 Honda CB650C Custom · Exhaust Service Parts Buying guide
Plan the sealing parts and mounting hardware together
Individual exhaust gaskets suit a small repair order, while the ten-pack supplies workshop stock. The stud set contains eight studs and eight flange nuts, making its contents a separate choice from the gasket quantity.
The individual gasket and ten-pack share replacement references 18212-634-000, 18291-236-000 and 18291-MN4-920. Choose the package that matches your planned seal replacements and spare-stock needs. The ten-pack is a quantity option, rather than a different exhaust application.
Assess the fastening parts before assembly
The CB650C stud set contains eight studs and eight flange nuts. Inspect the existing mounting hardware before starting exhaust work, and refer to the correct manual for the service procedure and tightening requirements. Keep gasket selection separate from the hardware set.
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.
Will a new stud set fix damaged cylinder-head threads?
No. Inspect the head threads before installing replacement studs. The stud supplier calls for proper extraction methods for seized hardware rather than forcing it in the aluminum head, followed by the specified installation depth and even flange-nut tightening. Resolve damaged threads before relying on new hardware.
Can I choose these for an aftermarket exhaust?
Check the connection at the cylinder head and the exhaust manufacturer’s requirements first. The listed CB650C application helps identify the original connection, but it does not establish every modified header or flange arrangement.
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