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1980 Honda CB650 Exhaust Port Seals & Studs

Identify the exhaust-port joints and mounting hardware disturbed by your 1980 CB650 repair before ordering parts. Port gaskets are available individually or as a ten-pack. The separate stud set supplies eight studs and eight flange nuts, so choose package sizes from the actual work.

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Honda motorcycle parts

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Honda CB kick stand stopper rubber 95011-61000

Honda CB Kick Stand Stopper Rubber ~ Replaces 95011-61000

$2.95 USD
07-4624
Replace a worn kick stand stopper with this Kick Stand Stopper Rubber "A", a direct replacement for OEM #95011-61000. Exceptionally broad fitment across the...
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 CB650 CB650C exhaust stud set

1979-82 Honda CB650 / CB650C Exhaust Stud Set

$34.95 USD
73-1139
Restore your exhaust system’s performance and reliability with this complete Exhaust Stud Set for your Honda CB650 or CB650C. Designed to meet OEM specs,...
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...
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1980 Honda CB650 · Exhaust Port Seals & Studs Buying guide

Count the port seals and fasteners needed for the repair

The gasket and stud packages have different contents. Compare the existing exhaust attachment and condition of the cylinder-head fittings before deciding whether the job requires seals alone or new mounting hardware.

Parts to consider

Honda CB Exhaust Headpipe Gasket (Each) ~ Replaces 18212-634-000 Individual exhaust-port gasketOne exhaust-port gasket; references 18212-634-000, 18291-236-000 and 18291-MN4-920.View part 1979-82 Honda CB650 / CB650C Exhaust Stud Set Exhaust stud and nut setEight exhaust studs and eight flange nuts for the CB650 application.View part Honda CB Exhaust Headpipe Gaskets ~ (Pk/10) ~ Replaces 18212-634-000 Exhaust-port gasket ten-packTen exhaust-port gaskets, supplied as a multi-pack rather than individually.View part

Choose gasket quantity without changing application

The single port-gasket item supplies one piece, while the larger pack supplies ten under the same stated reference family. Confirm the port application and count the joints being serviced. The larger pack is a quantity choice, not a different sealing location.

Inspect before replacing studs

Eight studs and eight flange nuts are listed in the hardware set. Assess the retained studs and head threads before planning removal and replacement. Use the proper service procedure rather than assuming a new set repairs damage to the head’s threaded holes.

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.

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.

What should I verify with an aftermarket exhaust?

Compare the engine-port attachment and gasket specification with the exhaust manufacturer’s requirements. The motorcycle application alone does not verify every altered pipe flange or mounting arrangement.

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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