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1985 Honda CB700SC Headpipe Sealing Gaskets

The 1985 CB700SC headpipe-gasket choices share overlapping replacement references and are sold individually. Identify the cylinder-head exhaust joint and count the pieces needed for the job. Do not assume that similarly named listings represent different materials or that one order is a four-pack.

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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....
Sold out
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...
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1985 Honda CB700SC · Headpipe Sealing Gaskets Buying guide

Check the gasket reference and individual quantity

Use the joint location and current specification to choose the gasket. Both listings cover the CB700SC headpipe application; compare their overlapping references and ask about any material difference that matters to the order.

Parts to consider

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 Honda CB Exhaust Headpipe Gasket (Each) ~ Replaces 18291-MM5-860 Headpipe gasketOne cylinder-head-to-headpipe gasket, replacing reference 18291-MM5-860.View part

Separate quantity from engine layout

Each selected listing supplies one gasket. Resealing all four CB700SC cylinder-head exhaust ports therefore requires four individual pieces. If only some joints are disturbed, order for those locations and inspect the sealing faces and mounting hardware before assembly.

Match the gasket reference and specification

Their stated CB700SC applications and replacement references overlap. If material or a dimensional difference matters to your choice, obtain that specification before ordering. An alternate catalog handle alone does not establish a different construction or a different place on the motorcycle.

Buying questions

Can an old exhaust-port gasket be left in place under a new one?

No. The replacement guidance calls for removal of the old crush gasket from the disturbed port before installing a fresh one. Check the seat carefully rather than stacking another gasket on top of an old compressed seal.

Do the two Honda references identify different exhaust-joint locations?

Both selected products cover the CB700SC cylinder-head-to-headpipe joint and share reference 18291-MM5-860; one also lists 18291-254-000. The extra reference does not make that item a collector or muffler-joint gasket, or prove a different material.

Can I use one at a collector connection?

The supported location is the cylinder-head-to-headpipe joint. Identify the collector’s sealing arrangement separately and use the requirements of the fitted exhaust system.

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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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