VintageCB750 Supplying CB Riders Since 2010

About Us Why Us? Reviews Shipping Info Returns Contact Us
Wish Lists
0 My Cart

Your cart is currently empty.

Browse all parts
Total (USD): $0.00
View cart
Menu
Search
Wish
Cart 0
My motorcycle Choose your Honda CB model

Search parts

Searching all Honda CB parts

Example: brake pads or oil filter.

1983 Honda CB450SC Nighthawk Port, Joint & Crossover Gaskets

Use the full Honda reference to narrow an exhaust-gasket purchase for your 1983 CB450SC Nighthawk. The port choices share three reference numbers but have different supplied quantities. Headpipe-joint and crossover seals follow their own references, which matter when similar-looking pieces are being compared.

Close ×
Your saved bike Choose your Honda CB model

Shop By Category

Most orders ship same or next business day Fitment guarantee Listed for your exact model and year? We’ll make it right if it doesn’t fit as described. Mechanic-backed support Ask our team for help choosing the right Honda CB part.
Currently viewing Gaskets & Mounting Hardware

Honda motorcycle parts

Choose your model and year to see parts listed for your bike.

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...
Sold out
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...
compare

1983 Honda CB450SC Nighthawk · Gaskets & Mounting Hardware Buying guide

Compare the full reference before the package size

For a port repair, the individual and ten-pack listings cover the same reference family. Pipe-joint choices remain separate: identify the headpipe joint or crossover and check any measurements needed for an altered exhaust.

Parts to consider

Honda CB Exhaust Headpipe Gaskets ~ (Pk/10) ~ Replaces 18212-634-000 Port seals in a ten-gasket packTen supplied, with references 18212-634-000, 18291-236-000 and 18291-MN4-920. Compare the package with your repair and spare requirements.View part Honda CB Exhaust Crossover Gasket ~ Replaces 18392-413-000 Crossover seal reference optionCrossover replacement identified by 18392-413-000 and 18392-MG7-750. Verify that the fitted joint requires this application.View part 1978-86 Honda CB450 / CB400 Exhaust Joint Gasket for Headpipe ~ Replaces 18391-413-000 Headpipe joint reference optionSeparate headpipe-joint replacement against 18391-413-000 and 18391-413-010. Confirm quantity and any required dimensions before ordering.View part

Related parts: Order individual port seals instead

Use shared references to compare the port packages

The individual port gasket and ten-pack both list 18212-634-000, 18291-236-000 and 18291-MN4-920. Once the required reference is matched, the decision becomes purchase quantity. This does not make either port option a substitute for a headpipe-joint or crossover gasket with a different application.

Check changed pipework against its own seal requirement

When a replacement exhaust changes a connection, compare its required gasket with the fitted or removed seal and the exhaust supplier information. The original Honda replacement references remain useful identifiers, but these pipe-joint products provide no dimensions or package count to resolve every custom connection by themselves.

Port, Joint & Crossover Gaskets questions

Which port-gasket package covers Honda reference 18291-MN4-920?

That reference appears on both port-gasket choices, alongside 18212-634-000 and 18291-236-000. Choose individual gaskets for a quantity you set or the ten-gasket pack for a larger order, after matching the exhaust-port application.

Which full references separate the two pipe-joint gasket choices?

For the headpipe joint, compare 18391-413-000 and 18391-413-010. For the crossover, compare 18392-413-000 and 18392-MG7-750. These are separate location-specific listings, so retain the full number when checking a removed sleeve or an earlier parts order.

What should I confirm when the motorcycle has replacement exhaust pipework?

Establish the replacement exhaust’s required seal dimensions and connection type, then compare the relevant Honda reference where applicable. Also confirm supplied quantity for joint or crossover gaskets; their descriptions do not specify measurements or a package count.

Not sure which part you need?

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

Ask a fitment question
Parts categories for 1983 Honda CB450SC Nighthawk

Your cart

×