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1981 Honda CB900F Exhaust Gaskets & Hardware

The 1981 CB900F exhaust-service choices include cylinder-head port gaskets, a separate muffler-joint gasket and replacement stud hardware. Identify the joint being opened and the fitted exhaust arrangement before ordering. A modified header or muffler may need a different connection from the original-style application.

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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...
Honda CB1100 CB1000 CB900 CB750 Honda exhaust pipe joint collar 18233-425-000

Honda CB1100 / CB1000 / CB900 / CB750 Genuine Honda Exhaust Pipe Joint Collar ~ OEM 18233-425-000

$24.95 USD
99-5455
Upgrade or restore your classic Honda motorcycle with this Exhaust Pipe Joint Collar — precision‑engineered and made in Japan. This genuine OEM part #18233‑425‑000...
Honda CB1100F CB900F CB750F muffler joint gasket

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

$9.95 USD
17-4507
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...
Honda CB750F CB900F CB1100F m.a.c. chrome slip-on megaphone muffler set

Honda CB750F / CB900F / CB1100F M.A.C. Chrome Slip-On Megaphone Muffler Set

$529.00 USD
07-001/2613
Refresh the back half of your F-Model Supersport exhaust with these Chrome Slip-On Megaphone Mufflers from M.A.C. Designed to bolt onto the factory 4-into-1...
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1981 Honda CB900F Supersport · Exhaust Buying guide

Choose the seal for the joint being opened

Port gaskets and muffler-joint gaskets seal different exhaust connections. The stud package supplies fastening hardware separately, so plan sealing and mounting needs without assuming one listing covers the entire system.

Parts to consider

Honda CB Exhaust Headpipe Gasket (Each) ~ Replaces 18291-254-000 Individual exhaust-port gasketOne gasket, references 18291-254-000 and 18291-MM5-860.View part 1979-83 Honda CB1100F / CB900F / CB750F Muffler Joint Gasket Muffler-joint gasketSeparate joint gasket listing for the 1981–82 CB900F.View part 1979-82 Honda CB900C / CB900F / CB750K Exhaust Stud & Flange Nut Set Exhaust studs and nutsContents specify eight studs and eight matching flange nuts.View part

Port seals are supplied one at a time

The port seals and muffler-joint gasket are separate purchases for separate connections. Count the joints disturbed by the repair and compare the fitted parts. The captured 18391-461-000 crossover listing names the 1982 F; its application is not extended to this 1981 guide.

Inspect the mounting before tightening

Check headpipe seating, split collars, studs and the downstream supports before reassembly. Tightening harder will not correct a misaligned system, damaged sealing face or stripped thread. Support the exhaust without forcing it into position and follow the Honda procedure for the actual assembly.

Buying questions

Will a fresh gasket cure every exhaust leak?

Check the joint alignment, sealing faces, clamps and hardware as well as the gasket. A crushed seal, loose joint or damaged stud can require different repairs. Identify whether the leak is at the cylinder head, a muffler joint or another connection before ordering.

Can I stop a leaking headpipe by tightening its nuts further?

Do not use extra force to compensate for misalignment, an incorrectly seated collar or a failed gasket. Inspect the parts and threads, support the system correctly and use the specified tightening procedure. Excess force can damage studs or cylinder-head threads.

Can original-style seals be assumed to fit a replacement exhaust?

Compare the actual joint construction and dimensions with the replacement requirements. An aftermarket header, collector or muffler can change those connections. Model application alone does not verify every modified exhaust, and gasket selection does not establish a jetting recommendation.

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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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