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  • 1979 Honda CB750 / CB650 Air Cut Off Valve ~ Replaces 16048-425-671
Honda CB750F CB750K CB750L CB650 air cut off valve 16048-425-671
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Honda CB750F CB750K CB750L CB650 air cut off valve 16048-425-671

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1979 Honda CB750 / CB650 Air Cut Off Valve ~ Replaces 16048-425-671

20-4021
$24.95 USD
In stock Usually ships the same or next business day
Check model fitment View fitment
Questions about this part? Contact us 4.8/5 1,354 store reviews
Secure checkoutProtected payment
60-day returnsEligible unused parts Free ground shippingUSA & Canada over $50
Browse all parts
1979 Honda CB750 / CB650 Air Cut Off Valve ~ Replaces 16048-425-671
$24.95 USD
Description

Replace your 1979 DOHC CB's carb air cut-off valve with this Carb Air Cutoff Valve, replacing OEM #16048-425-671 (diaphragm) and #16048-425-305 (spring + 1 O-ring). For 1979-only DOHC models.

Key Features
• Carb air cutoff valve
• Replaces OEM #16048-425-671 (diaphragm) + #16048-425-305 (spring + O-ring)
• For 1979-only DOHC models
• Honda part name: Valve Set, Air Cut

Fitment / Compatibility

• Honda CB750K (1979)
• CB750F (1979) Supersport
• CB750L (1979) Limited Edition

• Honda CB650 (1979)

Part Number: 20-4021

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

Make Model Year
Honda CB750K Standard 1979
Honda CB750F Supersport 1979
Honda CB750L Limited 1979
Honda CB650 1979

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

What is included with the 1979 Honda carburetor air cut-off valve?

The kit includes the diaphragm replacing Honda OEM 16048-425-671 plus the spring and one O-ring associated with OEM 16048-425-305.

How many air cut-off valve kits are required per motorcycle?

One kit is used for the shared air cut-off valve assembly on the applicable 1979 carburetor rack, so one kit services one motorcycle.

Will it fit 1980 or later DOHC CB carburetors?

No. The verified fitment is limited to the stated 1979 CB750K, CB750F, CB750L and CB650 applications. Later model years use different carburetor components.

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