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1986 Honda CB450SC Nighthawk — Soupapes et composants de distribution

Plan seal and guide-retention purchases for the 1986 CB450SC Nighthawk around the head actually being serviced. The intake stem seal and separate guide clip each supply one piece, but they have different location and design requirements. Identify affected intake positions and the installed guide construction before counting either order.

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Honda CB750 CB450 CB400 CB360 CB77 valve guide clip 12211-250-310

Honda CB Valve Guide Clip ~ Replaces 12211-250-310

$1.95 USD
73-0939
Replace your valve guide clip with this Valve Guide Clip, replacing OEM #12211-250-310.Sold each, order the quantity you require.Key Features• Valve guide clip• Replaces...
Honda CB400 CB450 CB125 valve stem seal 12208-413-003

Honda CB400 / CB450 / CB125 Valve Stem Seal

$3.10 USD
01-0128
Stop top-end oil loss with this Valve Stem Seal, a replacement for OEM #12208-413-003 / #12209-KL4-005 / #12209-428-003. Fits a range of smaller-displacement Hondas,...
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1986 Honda CB450SC Nighthawk · Valvetrain Buying guide

Check the intake seal positions and guide construction

The listed 12208-413-type seal is used at four intake positions on the compatible CB450 twin; the exhaust positions use a different specification. The 12211-250-310 clip suits a compatible stock-style guide. An integral shoulder on some performance replacement guides rules out adding a separate clip.

Parts to consider

Honda CB400 / CB450 / CB125 Valve Stem Seal Intake-position stem seal supplied eachOne seal is supplied for a matching intake position. A complete renewal of the listed CB450 intake positions calls for four of this specification; use a different specified seal for the exhaust positions.Voir la pièce Honda CB Valve Guide Clip ~ Replaces 12211-250-310 Individual stock-style guide retaining clipEach clip replaces 12211-250-310 for one compatible stock-style guide. Confirm the guide maker’s retention design before ordering for replacement or performance guides.Voir la pièce

Use guide and stem condition to define the seal repair

New stem seals can leave oil migration unresolved where guides are worn or stems damaged. Check the clearance before completing the order and protect each seal lip from sharp keeper grooves during installation. The seal reference identifies the replacement; it does not establish that the surrounding guide is ready for service.

Resolve guide retention with the chosen replacement design

Some replacement guides use an integral machined shoulder and must not receive this separate clip. For a compatible stock-style guide, the service checks include protrusion, interference fit, stem clearance and valve-seat alignment, using the Honda procedure and appropriate machine-shop equipment. Confirm the design before buying clips in quantity.

Valvetrain purchase questions

What quantity of these seals is needed to renew the listed intake positions?

Four individual seals cover the listed CB450 twin’s intake positions. Each package supplies one, so order four for a complete intake-seal renewal. The exhaust positions use another seal specification; determine that requirement separately rather than extending this intake order to every position.

What should determine the clip order when performance guides are being considered?

Choose and identify the guide design before ordering clips. Some performance guides have an integral machined shoulder and must not use a separate clip. The 12211-250-310 piece is supplied individually for a compatible stock-style guide, subject to the manufacturer’s instructions.

Which findings can change a seal-only repair into additional head work?

Worn guides, damaged valve stems or unsuitable stem-to-guide clearance can continue to draw oil after seal replacement. Have those conditions assessed before finalizing a seal-only order. Guide service also requires protrusion, interference-fit and valve-seat-alignment checks using the Honda procedure.

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