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1978 Honda CB400TII Hawk II Exhaust Gaskets

Exhaust gasket selection starts with the joint, not just the model year. The 1978 Hawk II choices include port seals at the cylinder head, headpipe joint sleeves and crossover seals. Compare the parts removed and decide whether you need individual port gaskets or workshop stock.

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Honda CB900 CB650 CB550 exhaust headpipe gasket (each) 18212-634-000

Honda CB Exhaust Headpipe Gasket (Each) ~ Replaces 18212-634-000

$3.58 USD
17-2813
Replace one exhaust port gasket on your CB650, CB400, CB450, or modern CB900F with this Exhaust Port Gasket, 1 piece, replacing OEM #18212-634-000 /...
Honda CB900 CB650 CB550 exhaust headpipe gaskets (pk 10) 18212-634-000

Honda CB Exhaust Headpipe Gaskets ~ (Pk/10) ~ Replaces 18212-634-000

$27.95 USD
17-3813
Stock up on exhaust port gaskets for your CB650, CB400, CB450, or modern CB900F with this 10-pack, replacing OEM #18212-634-000 / #18291-236-000 / #18291-MN4-920.Key...
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Honda CB450 CB400 exhaust joint gasket for headpipe 18391-413-000

1978-86 Honda CB450 / CB400 Exhaust Joint Gasket for Headpipe ~ Replaces 18391-413-000

$10.73 USD
17-4504
Replace your CB400 or CB450 exhaust joint gasket with this Exhaust Joint Gasket for Headpipe, replacing OEM #18391-413-000 / #18391-413-010.Key Features• Exhaust joint gasket...
Honda CB750 CB650 CB550 CB450 exhaust crossover gasket 18392-413-000

Honda CB Exhaust Crossover Gasket ~ Replaces 18392-413-000

$9.95 USD
17-4505
Replace your Nighthawk or CB400/CB450 exhaust crossover gasket with this Exhaust Crossover Gasket, replacing OEM #18392-413-000 / #18392-MG7-750. Fits the mid-'80s CB750SC/CB650SC/CB550SC Nighthawks plus...
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1978 Honda CB400TII Hawk II · Exhaust Gaskets Buying guide

Choose a gasket by its place in the exhaust

The individually supplied port gasket and ten-pack serve the same type of connection. Headpipe and crossover sleeve gaskets belong at other joints, so keep their references and locations separate when ordering.

Parts to consider

Honda CB Exhaust Headpipe Gasket (Each) ~ Replaces 18212-634-000 Individual exhaust port gasketOne gasket for the headpipe-to-cylinder-head joint. Sold individually; count the exhaust ports being opened rather than assuming one order covers the entire motorcycle.View part 1978-86 Honda CB450 / CB400 Exhaust Joint Gasket for Headpipe ~ Replaces 18391-413-000 Headpipe joint sleeve gasketSleeve-type gasket using references 18391-413-000 / 18391-413-010. Match it to the headpipe joint in the retained exhaust rather than selecting by the general word gasket.View part Honda CB Exhaust Crossover Gasket ~ Replaces 18392-413-000 Crossover joint gasketSleeve-type crossover gasket using references 18392-413-000 / 18392-MG7-750. The slip-in replacement muffler also specifies this gasket when fitted to the original exhaust box.View part

Related parts: Ten exhaust port gaskets

Separate port quantities from package quantities

An individual exhaust port gasket contains one seal, while the bulk product contains ten. Count the port joints being opened to decide the order quantity. The larger sleeve gaskets are separate selections, so a pack of port seals does not cover every joint along the exhaust.

Use the retained pipework to identify sleeve seals

The headpipe joint sleeve uses the 18391-413 reference family; the crossover seal uses 18392-413. These are different locations and should not be chosen by visual resemblance alone. Check the removed gasket and the original-style joint, especially if some of the exhaust has been replaced.

Common buying questions

How many port gaskets are in the bulk pack?

The bulk product contains ten exhaust port gaskets. The individual version contains one. Choose the package around the number of port joints being opened and whether you want extra seals for later work.

How do I choose between the two sleeve gaskets?

Identify the joint first. The headpipe joint sleeve uses the 18391-413 reference family, while the crossover sleeve uses 18392-413. Compare the removed seal and retained pipework before selecting the replacement.

Which sleeve should I choose for the muffler connection?

For the offered slip-in muffler fitted to the original exhaust box, the specified choice is the crossover-style gasket. Verify the retained connection first, because a changed exhaust system may require a different seal.

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