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1980 Honda CB900C Custom Exhaust Gaskets & Studs

Count the exhaust joints you will open on your 1980 CB900C Custom before ordering gaskets and studs. The gasket is supplied individually. The fastening package lists eight studs and eight flange nuts, so its contents should not be mistaken for eight total pieces.

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Honda CB1100 CB1000 CB900 exhaust headpipe gasket (each) 18291-254-000

Honda CB Exhaust Headpipe Gasket (Each) ~ Replaces 18291-254-000

$3.42 USD
17-2812
Replace one exhaust port gasket on your CB750 or big-bore DOHC CB with this Exhaust Port Gasket, 1 piece, replacing OEM #18291-254-000 / #18291-MM5-860....
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 CB1100 CB1000 CB900 exhaust headpipe gasket (each) 18291-MM5-860

Honda CB Exhaust Headpipe Gasket (Each) ~ Replaces 18291-MM5-860

$6.84 USD
18-7013
Replace one cylinder-head-to-exhaust-headpipe gasket on your big-bore Honda with this Cylinder Head to Exhaust Headpipe Gasket, 1 piece, replacing OEM #18291-MM5-860. Exceptionally broad fitment...
Honda CB900C CB900F CB750K exhaust stud and flange nut set

1979-82 Honda CB900C / CB900F / CB750K Exhaust Stud & Flange Nut Set

$34.95 USD
73-1140
Restore your classic Honda’s exhaust system with this premium Exhaust Stud Set, engineered for durability and a precise fit. This 8-piece kit includes eight...
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1980 Honda CB900C Custom · Exhaust Gaskets & Studs Buying guide

Count exhaust seals separately from fastening hardware

The headpipe gasket seals the exhaust-port joint, while studs and nuts secure the assembly. Inspect both the retained pipes and the cylinder-head fastening points before finalizing the repair order.

Parts to consider

Honda CB Exhaust Headpipe Gasket (Each) ~ Replaces 18291-254-000 Individual headpipe gasketOne exhaust-port gasket per purchase; order the quantity required for the joints opened.View part 1979-82 Honda CB900C / CB900F / CB750K Exhaust Stud & Flange Nut Set Exhaust studs and nutsEight exhaust studs and eight matching flange nuts; keep the two component counts separate.View part

Order gaskets for the joints disturbed

The featured gasket is sold individually for the headpipe-to-cylinder-head port. Four are needed when all four ports are resealed. Remove each old crush gasket from a disturbed port before fitting its replacement, and inspect the seating surface rather than stacking a new gasket over the old one.

Assess fastening damage before assembly

The stud package includes eight studs and eight matching flange nuts. New hardware does not establish that damaged cylinder-head threads or pipe flanges are sound. Have those conditions assessed before assembly and use the appropriate service specifications rather than guessed tightening values.

Buying questions

Can an old port gasket be left beneath the new one?

No. Remove the old crush seal from the disturbed port and inspect the seat before fitting a fresh gasket. A compressed old ring can be easy to overlook; stacking seals is not a substitute for preparing the joint properly.

Are the exhaust joint collars the same parts as the gaskets?

No. The 18233-425-000 product is one joint half-collar, with two used at each cylinder-head pipe joint. The gasket seals inside the port. Match the missing or damaged piece before ordering either product, and inspect the studs, nuts and flanges separately.

Should I replace studs just because I replace a gasket?

Inspect their condition and the threaded mounting points first. The required hardware scope depends on that inspection; a gasket replacement alone does not establish that every stud needs renewal.

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Send your model and year, plus photos of your existing part and any changes to the original setup.

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