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1986 Honda CB450SC Nighthawk — Pipes d’admission, manchons et colliers

Intake-holder service on a 1986 Honda CB450SC Nighthawk should begin with both joints inspected. A holder that is cracked or hardened can change the order from seals alone to an assembly. Each new holder contains its O-ring, while the separate four-ring pack serves compatible retained holder joints with a different package quantity.

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Consultation en cours Pipes d’admission, manchons et colliers

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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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1986 Honda CB450SC Nighthawk · Intake Holders & Seals Buying guide

Decide which joints need holders before adding the separate ring pack

One holder assembly replaces 16211-447-670 / 16211-413-750 and includes a 91325-413-830 seal; two assemblies replace both listed connections. The seal pack identifies 91301-371-005 / 91325-413-830 at 40 × 2.6 mm, with four supplied and two used per listed motorcycle.

Parts to consider

1980-86 Honda CB450 / CB400 Carb Holder with O-Ring ~ Replaces 16211-447-670 Individual holder assembly including its seal16211-447-670 / 16211-413-750 holder with 91325-413-830 replacement O-ring; two holders used.Voir la pièce 1978-86 Honda CB450 / CB400 Cylinder Head Intake Boot O-Rings (Set/4) ~ Replaces 91301-371-005 Four-ring pack for retained intake joints40 × 2.6 mm seals; two used per listed motorcycle, giving two stated motorcycle sets in a pack.Voir la pièce

Do not tune around a damaged holder when deciding the repair

The holder listing describes cracking, hardening or poor sealing as possible intake-leak causes, with hanging idle or difficult synchronization among the stated effects. Check both holders before tuning. The ring listing also warns that a damaged holder or mounting surface can leave a leak even after new seals are fitted.

Plan the mixed order from each connection’s inspection result

A new holder already supplies the joint O-ring, while the separate pack is for matching retained joints. Count new assemblies and retained holders separately. During the work, clean the head sealing surface, avoid pinching the supplied ring and confirm the carburetor is properly seated and supported without strain.

Parts ordering FAQs

What holder findings should change a seal-only parts order?

Cracks, hardening, poor sealing or damaged mounting faces can leave an intake leak after ring replacement. Inspect both holders, their flat faces and the cylinder-head grooves. Use those findings to choose a reference-matched holder assembly instead of assuming the four-ring pack will correct retained damage.

How should I count supplies when renewing one holder but sealing the other retained joint?

The holder includes one O-ring, so count that supplied seal first. The retained joint can use a matching 40 × 2.6 mm ring from the four-piece pack. Identify each connection’s repair path before adding the pack, rather than counting every joint as an unsealed assembly.

Which support checks should be included when assessing the new holder’s installation?

The holder listing requires a clean cylinder-head sealing surface, an O-ring seated without pinching and evenly tightened fasteners to Honda specifications. Confirm that the carburetor is fully seated and supported without straining the holder. No universal torque or altered-airbox adapter dimensions are published.

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