1981 Honda CB900F Exhaust Seals & Mounts

Use this 1981 CB900F route to plan the sealing and fastening pieces needed when exhaust joints are opened. Individual headpipe gaskets, a muffler-joint gasket and a stud-and-nut package serve separate positions. Compare the installed exhaust before relying on a shared model application after modifications.

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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

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

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...

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Honda CB1100 CB1000 CB900 exhaust headpipe gasket (each) 18291-MM5-860

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

$6.84 USD

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

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...

1979-83 Honda CB1100F / CB900F / CB750F Muffler Joint Gasket

$9.95 USD

Replace your DOHC CB's muffler joint gasket with this Muffler Joint Gasket, fitting the 1979-82 CB750F Supersport, 1981-82 CB900F Supersport, and 1983 CB1100F Supersport.Key...

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1981 Honda CB900F Supersport · Exhaust Seals & Mounts Buying guide

Count the seals and inspect the fasteners

A port gasket is a single-piece purchase. The stud package lists eight studs with eight flange nuts, while the muffler-joint gasket remains separate. Build the order around the connections actually being serviced.

Parts to consider

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

Head-to-headpipe gasketOne gasket per purchase, reference 18291-MM5-860.View part

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

Eight studs with eight flange nutsThe explicit contents list includes both the studs and matching nuts.View part

1979-83 Honda CB1100F / CB900F / CB750F Muffler Joint Gasket

Separate muffler-joint gasketNamed application includes the 1981–82 CB900F Supersport.View part

Choose by joint rather than category

Match the cylinder-head port and muffler-joint seals to their own connections. The featured headpipe gasket is sold each. Do not add the separately tagged crossover gasket on the assumption that its explicit 1982 F application also covers this 1981 exhaust.

Plan seals and fasteners from their condition

Inspect stud threads, flange nuts, collars and the exhaust supports while the system is accessible. The stud package contains eight studs and eight nuts but does not repair stripped cylinder-head threads. Resolve damaged threads and misalignment before fitting new seals or applying the specified tightening procedure.

Buying questions

How do I distinguish a headpipe seal from a muffler-joint gasket?

Identify the connection being opened and compare the removed part, joint dimensions and replacement reference. The head-to-headpipe seal sits at the cylinder head; a muffler-joint or crossover seal serves another connection. Similar category names do not make them interchangeable.

Will a new stud set repair damaged threads in the cylinder head?

No. Inspect both the studs and the threaded holes. A stripped or previously repaired hole needs assessment and a suitable thread-repair plan before new hardware is fitted. Do not force a new stud into damaged threads or compensate with extra tightening.

What should I check if the exhaust will not line up with new gaskets fitted?

Check that the correct seals and collars are seated and that the headpipes, joints and mounting brackets match the fitted system. Support and align the assembly according to its service procedure before tightening. Do not pull a misaligned exhaust into place with the studs.

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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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