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  • 1980-82 Honda CB900 / CB450 / CB400 Carb Pump Diaphragm ~ Replaces 16021-413-751
Honda CB900 CB450 CB400 carb pump diaphragm 16021-413-751
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Honda CB900 CB450 CB400 carb pump diaphragm 16021-413-751

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1980-82 Honda CB900 / CB450 / CB400 Carb Pump Diaphragm ~ Replaces 16021-413-751

20-9041
$27.03 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 1,347 store reviews
Secure checkoutProtected payment
60-day returnsEligible unused parts Free ground shippingUSA & Canada over $50
Browse all parts
1980-82 Honda CB900 / CB450 / CB400 Carb Pump Diaphragm ~ Replaces 16021-413-751
$27.03 USD
Description

Rebuild your Keihin carb's accelerator pump with this Carb Pump Diaphragm, replacing OEM #16021-413-751 / #16021-438-671 / #16021-463-004. Kit contains 1 diaphragm with rod, 1 bellow rubber, and O-rings.

Key Features
• Carb pump diaphragm for Keihin carbs
• Replaces OEM #16021-413-751 / -438-671 / -463-004
• Includes diaphragm with rod + bellow rubber + O-rings
• Honda part name: Diaphragm Set, Pump

Fitment / Compatibility

• Honda CB900F (1981‑82) Supersport

• Honda CB400T (1980‑81)
• CB450SC (1982)
• CB450T (1982)

Part Number: 20-9041

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

Make Model Year
Honda CB900F Supersport 1981
Honda CB900F 1982
Honda CB400TA Hawk 1980
Honda CB400TB Hawk 1981
Honda CB450SCC Nighthawk 1982
Honda CB450TC 1982

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.

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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.

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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 in accelerator-pump kit 20-9041?

The kit includes one diaphragm with rod, one bellows rubber and the required O-rings for servicing the Keihin accelerator-pump assembly on one compatible carburetor rack.

Which Honda pump-diaphragm numbers does 20-9041 replace?

It cross-references Honda 16021-413-751, 16021-438-671 and 16021-463-004.

What problem can a damaged accelerator-pump diaphragm cause?

A split, hardened or leaking diaphragm can prevent the pump from delivering its enrichment shot during throttle opening, causing hesitation while accelerating.

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