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  • Honda CB Pilot Jet Set ~ Size #40 (Pk/4)
Honda CB750 CB550 CB500 CB400 CB350 pilot jet set size 40 (pk 4)
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Honda CB750 CB550 CB500 CB400 CB350 pilot jet set size 40 (pk 4)

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5.0 ( 1 review)

Honda CB Pilot Jet Set ~ Size #40 (Pk/4)

48-3103
$15.95 USD

Sold as a pack of 4

In stock Usually ships the same or next business day
Check model fitment View fitment
Questions about this part? Contact us 4.8/5 1,336 store reviews
Secure checkoutProtected payment
60-day returnsEligible unused parts Free ground shippingUSA & Canada over $50
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1 product reviews

Honda CB Pilot Jet Set ~ Size #40 (Pk/4)

Honda CB Pilot Jet Set ~ Size #40 (Pk/4)
$15.95 USD
Description

Tune your low-speed circuit with this Pilot Jet Set of 4, size #40. Jet height 28mm, outer diameter 5.5mm.

Pilot jets control your idle and low-speed operation, critical for smooth idling and lower-rpm driving. When rebuilding carbs, it is highly recommended to replace these pilot jets to ensure your bike runs as well as possible. When installing new exhaust or high-flow air filters, it is recommended to increase the size of your pilot jets.

We list the stock pilot jet sizes that came with the bikes below; use this list as a reference if you are trying to increase, decrease, or keep the pilot jet size stock. We offer other sizes (above and below this part listing).

Key Features
• Pilot jet set of 4, size #40
• Jet height 28mm, outer diameter 5.5mm

Fitment / Compatibility

• Honda CB750K (1969‑76), stock size 40
• CB750F (1975‑76) Supersport, stock size 40

• Honda CB500K (1971‑73), stock size 40
• CB550F (1975‑77) Supersport, stock size 38
• CB550K (1974‑76), stock size 38

• Honda CB350F (1972‑74) Supersport, stock size either 35 or 38
• CB400F (1975‑77) Supersport, stock size either 38, 40, or 42

Part Number: 48-3103

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

Make Model Year
Honda CB750K Standard 1969
Honda CB750K 1970
Honda CB750K 1971
Honda CB750K 1972
Honda CB750K 1973
Honda CB750K 1974
Honda CB750K 1975
Honda CB750F Supersport 1975
Honda CB750K 1976
Honda CB750F 1976
Honda CB550K0 1974
Honda CB550K1 1975
Honda CB550K2 1976
Honda CB550F1 1975
Honda CB550F2 1976
Honda CB550F3 1977
Honda CB500K0 1971
Honda CB500K1 1972
Honda CB500K2 1973
Honda CB400F 1975
Honda CB400F 1976
Honda CB400F 1977
Honda CB350F0 1972
Honda CB350F0 1973
Honda CB350F1 1974

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 #40 Honda pilot jets are included?

Four #40 pilot jets are included, one for each carburetor in a compatible four-cylinder Honda rack. Each jet is 28mm high with a 5.5mm outside diameter.

Is pilot-jet size #40 stock for every compatible Honda?

No. #40 is listed as stock for the 1969-1976 CB750K, 1975-1976 CB750F and 1971-1973 CB500K, and as one possible stock size for some CB400F applications.

Should pilot-jet size automatically be increased for an exhaust or air-filter change?

No. Jetting must match the complete intake, exhaust, engine condition, elevation and carburetor setup. Change one step at a time and verify mixture by proper tuning rather than assuming a larger jet is correct.

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