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1983 Honda CB1000C Exhaust Gaskets

Gasket parts for the exhaust on the 1983 Honda CB1000C include two port gasket options, one at a lower price and one with wide big-bore fitment, plus the crossover gasket used on the 1982-83 big-bore models.

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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 CB1100F CB1000C CB900F exhaust crossover gasket 18391-461-000

1982-83 Honda CB1100F / CB1000C / CB900F Exhaust Crossover Gasket ~ Replaces 18391-461-000

$11.69 USD
17-4537
Replace your big-bore DOHC exhaust crossover gasket with this Exhaust Crossover Gasket, replacing OEM #18391-461-000. Fits the 1982 CB900F Supersport, 1983 CB1000C Custom, and...
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1983 Honda CB1000C · Exhaust Gaskets Buying guide

Choose the joint before the gasket

A cylinder-head gasket and a crossover gasket seal different connections. Check which joints the repair will disturb and whether the motorcycle retains the original exhaust before building the order.

Gaskets to consider

Honda CB Exhaust Headpipe Gasket (Each) ~ Replaces 18291-254-000 Exhaust port gasket, each17-2812 cross-references 18291-254-000 and 18291-MM5-860 and explicitly lists the CB1000C.View part Honda CB Exhaust Headpipe Gasket (Each) ~ Replaces 18291-MM5-860 Headpipe gasket, wide fitment18-7013 cross-references 18291-MM5-860 and explicitly lists the CB1000C.View part 1982-83 Honda CB1100F / CB1000C / CB900F Exhaust Crossover Gasket ~ Replaces 18391-461-000 Crossover gasket17-4537 is for the listed crossover connection, not a cylinder-head exhaust port.View part

Two listings for the port joint

Both individual port-gasket listings name the 1983 CB1000C. Their shared reference identifies the intended application, but the descriptions do not document a material or construction advantage for the higher-priced option. Confirm the installed exhaust’s requirements if it has been changed.

Replace the seal, then check the result

Honda’s common exhaust-service guidance calls for a new gasket after pipe removal and a leakage check after assembly. Follow the model or exhaust manufacturer’s tightening and any specified retorque procedure; do not keep tightening to compensate for a poorly seated pipe.

Gasket questions

Can I fit a new gasket on top of the old one?

No. Remove the old crush gasket from the opened port and clean the seat before installing the replacement. A compressed gasket can be difficult to see in a carbon-darkened recess, so confirm that the recess is clear before refitting the pipe.

Must I replace every exhaust gasket when only one joint is opened?

Plan new seals for the joints that are disturbed. If all four headpipes are removed, all four port joints need fresh gaskets. The separate crossover gasket is relevant when that connection is opened or requires repair; it is not an additional port gasket.

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