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1981 Honda CB900C Custom Exhaust Service Choices

Inspect the exhaust layout on your 1981 CB900C Custom before deciding between muffler replacement and joint service. The M.A.C. pair is listed for the factory-style arrangement. Port gaskets are individual pieces, and the stud package has separate stud and nut counts that should be checked before ordering.

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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...
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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
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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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 CB900C m.a.c. chrome slip-on flare tip muffler set

1980-82 Honda CB900C M.A.C. Chrome Slip-On Flare Tip Muffler Set

$499.95 USD
07-001/3111
Drop in a pair of Chrome Slip-On Flare Tip Mufflers from M.A.C. for your Honda CB900C Custom. A direct-fit replacement for factory-style mufflers with...
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1981 Honda CB900C Custom · Exhaust Service Choices Buying guide

Identify the exhaust repair before choosing its parts

Muffler fit depends on the retained pipes and supports, while port seals and studs address cylinder-head joints. Compare the actual system, especially if earlier owners changed its headers or mounting points.

Parts to consider

1980-82 Honda CB900C M.A.C. Chrome Slip-On Flare Tip Muffler Set M.A.C. chrome slip-on mufflersPair of flare-tip mufflers with all-steel baffles, listed for the CB900C Custom’s factory-style exhaust arrangement.View part 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

Count the exhaust-port seals for the repair

Each featured headpipe gasket is one exhaust-port seal. Resealing all four cylinder-head ports needs four individual gaskets; remove the old crush seals from the disturbed joints first. The seals do not replace the joint half-collars, studs or nuts, which need separate inspection.

Check the retained system before choosing slip-ons

The M.A.C. 001-3111 pair is a slip-on replacement for the original-style CB900C exhaust arrangement. Confirm the retained headpipes, balance box, connecting joints and mounting supports before ordering. Its all-steel baffle description does not establish a separate serviceable packing kit or compatibility with an unrelated full-system header.

Buying questions

Will these slip-ons replace a complete aftermarket 4-into-1 system?

They are a paired slip-on set intended for the original-style CB900C arrangement. An aftermarket collector or header can have different outlets and supports. Identify the retained system and confirm those connections before treating the pair as a complete-system replacement.

Does the no-rejetting description cover a modified intake and exhaust?

That description applies to the intended stock-style installation. It does not establish a fuel-setting plan for changed air filters, headers or other engine modifications. Assess the complete installed combination instead of choosing jets from the muffler finish or a general fitment label.

Will an exhaust-port gasket seal a leak at the muffler connection?

Locate the leak before ordering. These individual gaskets seal the headpipe-to-cylinder-head ports. The slip-on connections farther back use their own joint arrangement, so an exhaust-port gasket is not a universal seal for every exhaust leak.

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