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1983 Honda CB450SC Nighthawk Intake Holder Package Planning

For the 1983 Honda CB450SC Nighthawk intake joints, choose between a holder assembly with its own ring and a separate pack of sealing rings. Inspect the holder bodies and sealing faces first. Their condition determines whether the order needs rubber assemblies, seals, or both for different identified service locations.

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Honda CB450 CB400 cylinder head intake boot o-rings (set 4) 91301-371-005

1978-86 Honda CB450 / CB400 Cylinder Head Intake Boot O-Rings (Set/4) ~ Replaces 91301-371-005

$8.19 USD
48-5044
Replace your cylinder head intake boot O-rings with this Cylinder Head Intake Boot O-Rings Set of 4, size 40 x 2.6mm. Replaces OEM #91301-371-005...
Honda CB450 CB400 carb holder with o-ring 16211-447-670

1980-86 Honda CB450 / CB400 Carb Holder with O-Ring ~ Replaces 16211-447-670

$24.95 USD
33-0017
Ensure a secure and reliable connection between the carburetor and intake with this Carb Holder with O-Ring, designed as a direct replacement for the...
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1983 Honda CB450SC Nighthawk · Intake Holders & Joint Seals Buying guide

Match the holder reference and the head-joint seal

Holder references are 16211-447-670 / 16211-413-750, with one 91325-413-830 O-ring included per assembly. Two holders are used. The separate pack names 91301-371-005 / 91325-413-830 and supplies four 40 x 2.6 mm rings, with two used at the listed motorcycle’s cylinder-head joints.

Parts to consider

1978-86 Honda CB450 / CB400 Cylinder Head Intake Boot O-Rings (Set/4) ~ Replaces 91301-371-005 Four 40 x 2.6 mm joint sealsPack identifies 91301-371-005 / 91325-413-830; its four rings provide two listed motorcycle sets.View part 1980-86 Honda CB450 / CB400 Carb Holder with O-Ring ~ Replaces 16211-447-670 One holder assembly with a sealing ringOne holder and one O-ring are supplied together; two assemblies are used for the listed intake connections.View part

Use holder condition to decide whether seal-only service is appropriate

The seal-pack FAQ warns that new O-rings can leave an air leak if the holder or mounting surface is damaged. Inspect cracks, hardening and the flat sealing faces. The decision to retain a holder should follow those checks rather than the availability of an inexpensive seal pack.

Calculate the package quantity before adding spare seals

A pair of new holders already supplies a pair of rings. The separate four-ring pack covers two matched motorcycle sets according to its FAQ. Keep those supplied counts visible when ordering, so the pack is added for an identified seal requirement rather than presumed missing contents.

Common questions

Which seal reference is shared by the holder assembly and separate ring pack?

Both listings identify 91325-413-830. The holder includes one O-ring, while the separate pack also names 91301-371-005 and supplies four 40 x 2.6 mm rings. Match the actual joint and holder application before choosing the appropriate package.

What package quantities cover replacement of both intake holder assemblies?

Order two holder assemblies for both listed connections. Each supplies one holder with one O-ring, so the pair includes two sealing rings. The separate four-ring pack is a different purchase and is not automatically required with the two new assemblies.

Could a damaged sealing face make a rings-only order insufficient?

Yes. The seal FAQ states that leaks can remain with new O-rings when a holder or mounting surface is damaged. Inspect the holder’s cracks, hardening and sealing faces along with the cylinder-head joint before choosing seals alone.

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