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  • 1974-78 Honda CB550F / CB550K Cylinder Head Breather Cover ~ Genuine Honda 12320-374-000
Honda CB550F CB550K cylinder head breather cover 12320-374-000
Honda CB550F CB550K cylinder head breather cover 12320-374-000 — OEM fiche location reference
Honda CB550F CB550K cylinder head breather cover 12320-374-000
Honda CB550F CB550K cylinder head breather cover 12320-374-000
Honda CB550F CB550K cylinder head breather cover 12320-374-000
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Honda CB550F CB550K cylinder head breather cover 12320-374-000

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Load image into Gallery viewer, Honda CB550F CB550K cylinder head breather cover 12320-374-000 — OEM fiche location reference
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Load image into Gallery viewer, Honda CB550F CB550K cylinder head breather cover 12320-374-000
Load image into Gallery viewer, Honda CB550F CB550K cylinder head breather cover 12320-374-000

1974-78 Honda CB550F / CB550K Cylinder Head Breather Cover ~ Genuine Honda 12320-374-000

99-5158
$129.95 USD

Sold individually

In stock Usually ships the same or next business day
Check model fitment View fitment
Questions about this part? Contact us 4.8/5 1,355 store reviews
Secure checkoutProtected payment
60-day returnsEligible unused parts Free ground shippingUSA & Canada over $50
Browse all parts
1974-78 Honda CB550F / CB550K Cylinder Head Breather Cover ~ Genuine Honda 12320-374-000
$129.95 USD
Description

This genuine Honda cylinder head breather cover mounts on the cylinder head cover and is part of the engine breather system on Honda CB550 four-cylinder models. It is the small top breather cover used on the valve cover / rocker cover assembly where the breather opening needs the correct OEM-style cover.

Use this OEM Honda breather cover when the original cover is cracked, damaged, corroded, missing, or being replaced during CB550 cylinder head cover service, engine work, or restoration.

Key Features
• Genuine Honda OEM part
• Honda OEM part number: 12320-374-000
• OEM description: COVER, BREATHER
• Cylinder head breather cover / valve cover breather cover / rocker cover breather cap
• Sold individually
• Quantity required: 1 per motorcycle
• Breather cover gasket is not included; inspect or replace the gasket separately as needed.

Fitment / Compatibility
• Honda CB550K (1974-1978)
• CB550F (1975-1977)

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Check the listed model and year, then read any fitment notes in the description.

Make Model Year
Honda CB550K0 1974
Honda CB550K1 1975
Honda CB550K2 1976
Honda CB550K3 1977
Honda CB550K4 1978
Honda CB550F1 1975
Honda CB550F2 1976
Honda CB550F3 1977

Free ground shipping over $50

To the USA & Canada. In-stock orders usually ship from our own warehouse the same or next business day.

Estimated ground delivery after your order ships
DestinationDelivery time
USA4–7 business days
Canada2–6 business days

Ground shipping includes tracking, emailed when your order ships. Need it sooner? Express options are available at checkout.

See full shipping details

60-day returns on eligible parts

No restocking fees. Eligible parts must be unused, uninstalled, unaltered and complete. The 60-day window starts when your order is delivered.

Electrical parts are excluded from standard returns. Check return eligibility.

Start your return below. Wait for our instructions before mailing a part back.

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Other shipping options

Canada Post Economy: Available at checkout for select small items. Allow 1–3 weeks for delivery. No tracking or insurance is included.

Outside the USA & Canada: Delivery times vary by destination and shipping method. Buyers are responsible for applicable duties, taxes and import fees. We cannot mark orders as gifts.

Frequently Asked Questions

How many CB550 cylinder-head breather covers are included?

One genuine Honda breather cover, OEM 12320-374-000, is included, enough for one compatible 1974-1978 CB550F or CB550K engine.

Is the gasket included with Honda breather cover 12320-374-000?

No. The breather-cover gasket is not included and must be reused only if serviceable or ordered separately.

Why should the breather passage be checked during installation?

A blocked or restricted crankcase breather can contribute to oil leaks and pressure buildup. Clean the passage without dropping debris into the engine and route the breather hose correctly.

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