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1985 Honda CB700SC Exhaust Gasket Choices

For exhaust sealing on the 1985 CB700SC, identify the cylinder-head joint being opened before choosing a gasket. Compare the fitted connection and surrounding condition, then count individual headpipe gaskets for the specific repair or removal work. Changed exhaust connections need their own application check.

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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....
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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 CB700SC m.a.c. 4-into-1 chrome exhaust system

1984-86 Honda CB700SC M.A.C. 4-Into-1 Chrome Exhaust System

$599.95 USD
07-001/3001
Give your Honda CB700SC Nighthawk a proper exhaust upgrade with this M.A.C. 4-into-1 Upswept Megaphone Chrome Exhaust. A complete replacement system designed for the...
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1985 Honda CB700SC · Exhaust Gasket Choices Buying guide

Choose headpipe seals for the joints being opened

The gasket application is at the cylinder head. A leak elsewhere in the exhaust needs its own identification, especially when collectors, mufflers or a complete system have been changed.

Parts to consider

Honda CB Exhaust Headpipe Gasket (Each) ~ Replaces 18291-MM5-860 Headpipe gasketOne cylinder-head-to-headpipe gasket, replacing reference 18291-MM5-860.View part Honda CB Exhaust Headpipe Gasket (Each) ~ Replaces 18291-254-000 Exhaust-port gasketSold as one gasket; references 18291-254-000 and 18291-MM5-860.View part

Order by the number of opened joints

Each featured gasket listing supplies one cylinder-head-to-headpipe seal. The four-cylinder CB700SC needs four individual gaskets when all four headpipe joints are resealed. Count only the joints included in a partial repair, and inspect the mounting and sealing surfaces before fitting new gaskets.

Distinguish the original exhaust from a complete replacement

Honda’s original system has right and left mufflers and a separate muffler-joint gasket. The M.A.C. 001-3001 item elsewhere in this category is a complete 4-into-1 replacement, not a slip-on. Its listing states center-stand retention and service access; verify its installation requirements and gasket contents separately from these single headpipe gaskets.

Buying questions

Will an exhaust-port gasket seal the joint between the original muffler sections?

It is a different joint. Honda identifies a separate muffler-joint gasket in the original exhaust. Locate the leak before buying so a headpipe-port gasket is not mistaken for the seal needed farther along the system.

Does the listed M.A.C. system replace just one original muffler?

No. M.A.C. 001-3001 is listed as a complete 4-into-1 exhaust with an upswept megaphone. It is a different purchase from these individual headpipe gaskets, and the gasket listings do not establish what installation consumables the complete system includes.

Should every exhaust leak prompt a gasket order?

Locate the leak and inspect the connection first. A damaged surface, mounting problem or leak at another joint can require a different repair from an exhaust-port gasket replacement.

Not sure which part you need?

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

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