1978 Honda CB400TII Hawk II Exhaust Parts

An exhaust repair on the 1978 Hawk II may involve a cylinder-head port seal, a sleeve joint or a replacement muffler. Identify where the leak or damage sits, then check the exhaust already fitted before building an order for one side or both.

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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

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

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

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

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...

Chrome Slip In Style Muffler ~ 23 7/8" Long

$139.95 USD

Chrome Slip In Honda Style Muffler ~ 23 7/8" Long with 4" Diameter. Fits to bikes that use a slip in inlet such as...

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1978 Honda CB400TII Hawk II · Exhaust Buying guide

Follow the exhaust from the port to the muffler

Port gaskets and sleeve gaskets seal different connections. The chrome slip-in muffler is a separate, individually supplied choice for a compatible retained exhaust arrangement, with an adjustable mounting bracket.

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

Chrome slip-in mufflerA 23⅞-inch-long, 4-inch-diameter muffler with an adjustable slide bracket. Fits either side and is sold individually; verify the retained slip-in joint and mounting position.View part

Buy the seal for the connection being opened

The small exhaust port gasket seals at the cylinder head and is sold individually or in a ten-pack. The headpipe joint uses a separate sleeve gasket. Compare the removed seal, joint location and retained pipework before ordering, especially where an aftermarket system has replaced part of the original exhaust.

Plan the muffler and joint together

The chrome slip-in muffler is sold individually, fits either side and includes an adjustable slide bracket. It measures 23⅞ inches long and 4 inches in diameter. When fitting it to the original exhaust box, use the linked crossover-style joint gasket and check the bracket position and surrounding clearance.

Common buying questions

Does one muffler order replace both sides?

No. The chrome slip-in muffler is sold individually and can be used on either side. Order two for a two-sided replacement after confirming that the retained exhaust joints and mounting positions suit it.

Are all the exhaust gaskets the same type?

No. The cylinder-head port gasket and the sleeve gaskets farther along the exhaust serve different connections. Identify the joint being opened, then compare the removed gasket and retained pipework before ordering.

Can I use these parts with a changed exhaust system?

Check the system that is actually fitted. Port seals, sleeve joints and muffler connections must match their locations; an aftermarket collector or header arrangement may no longer use the original slip-in joints.

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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