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1981 Honda CB650C Custom Exhaust Seals & Studs

Exhaust service parts for the 1981 CB650C focus on sealing the headpipe connection and renewing the mounting hardware. Count the joints being opened, then inspect the studs and flange nuts. Gasket package size should follow the planned work rather than be confused with an engine-wide hardware kit.

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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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1981 Honda CB650C Custom · Exhaust Seals & Studs Buying guide

Count the sealing joints and inspect the fasteners

The individual and ten-pack gasket options share their application references. The separate fastening set supplies eight studs and eight flange nuts, giving a clear contents check when planning broader exhaust removal.

Parts to consider

Honda CB Exhaust Headpipe Gasket (Each) ~ Replaces 18212-634-000 Individual exhaust port gasketOne gasket replacing references 18212-634-000, 18291-236-000 and 18291-MN4-920.View part Honda CB Exhaust Headpipe Gaskets ~ (Pk/10) ~ Replaces 18212-634-000 Ten-pack exhaust port gasketsTen exhaust port gaskets with the same replacement references as the individual gasket.View part 1979-82 Honda CB650 / CB650C Exhaust Stud Set Exhaust stud and flange-nut setEight exhaust studs and eight flange nuts, listed for the 1980–81 CB650C Custom.View part

Choose gasket packaging for the repair

The single gasket and ten-pack use references 18212-634-000, 18291-236-000 and 18291-MN4-920. Their main ordering difference is supplied quantity. Choose the package for the actual repair and any intended spares without treating the bulk pack as a different fitment.

Assess fastening condition before disassembly

The stud set contains eight studs with eight flange nuts for the listed Custom application. Inspect the installed hardware and follow the correct service procedure for removal and fitting. Do not infer torque values or removal methods from the package size.

Exhaust Seals & Studs 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.

How should I choose for an aftermarket header?

Compare the connection at the cylinder head and the exhaust manufacturer’s requirements. A stock-application listing does not establish every modified flange or header arrangement.

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