Royal Enfield Pilot Jet for BS29 Carburetor – 570840/A

Royal Enfield Pilot Jet for BS29 Carburetor – 570840/A

570840/A is a genuine Royal Enfield Pilot Jet. Public Royal Enfield fiche-style sources, OEM-style seller pages, and parts-list indexes consistently identify this part number as PILOT JET. The surrounding carburetor hardware sequence in Royal Enfield parts indexes places it directly with main jet, pilot air jet, jet holder, and related carburetor tuning parts, which strongly confirms that this is a carburetor idle/low-speed fuel metering jet rather than a generic fastener or engine hardware item.

This is the right part for carbureted Royal Enfield owners dealing with rough idle, poor cold starting, hesitation just off idle, unstable low-speed running, or carburetor service where the pilot circuit needs correct OEM jetting. Buyers also search for this as Royal Enfield pilot jet, BS29 pilot jet, Bullet 350 carburetor pilot jet, idle jet Royal Enfield, and carb pilot jet RE.

Before you buy: this is best sold as a BS29 carburetor pilot jet with supported older carb/early-UCE market fitment references. Match the old jet, carburetor type, and part number before ordering. Do not buy it for EFI motorcycles or newer fuel-injected platforms.

Key Features

• Genuine Royal Enfield OEM pilot jet
• Part number: 570840/A
• Official description: Pilot Jet
• Part of the carburetor idle / low-speed fuel circuit
• Located in the BS29 carburetor jet family with pilot air jet, main jet, and jet holder references
• Useful during carburetor servicing, idle tuning, and jet replacement work
• Relevant for rough idle, poor off-idle response, or blocked/worn jet replacement
• Best ordered by exact part number and carburetor match

Compatibility Table

Variants

No variants under this SKU. Related nearby carburetor parts in Royal Enfield parts indexes include 570837/A Main Jet, 570838/A Jet Holder, and 570839/A Pilot Air Jet.

Before You Buy Checklist

• Confirm your bike uses the BS29 carburetor or matching carburetor application
• Match the old jet and part number before ordering
• Do not order this for EFI motorcycles
• Check whether your service job needs pilot jet only or a wider carb rebuild kit
• Use part number + carburetor family + old-part match as the safest buying method

FAQs

1) What is 570840/A?
It is the genuine Royal Enfield Pilot Jet.

2) What does a pilot jet do?
It meters fuel in the carburetor’s low-speed / idle circuit, which affects idle quality and off-idle response.

3) Is this for EFI bikes?
No. A pilot jet is a carburetor part and should not be bought for standard EFI motorcycles.

4) Which bikes are commonly linked to it?
Seller references connect it to older carbureted / early-UCE Royal Enfield models such as TBTS, Bullet 350 UCE KS/ES, Electra 350 UCE ES, Classic 350, and Thunderbird 350.

5) OEM or aftermarket?
This is a genuine Royal Enfield OEM part number.

6) What symptoms can point toward pilot jet problems?
Blocked or incorrect pilot jets can contribute to rough idle, hesitation just off idle, and poor low-speed running.

7) What should I check before ordering?
Check the carburetor type, old jet, exact part number, and whether the motorcycle is carbureted rather than fuel injected.

Also Searched As

Royal Enfield pilot jet, BS29 pilot jet, Bullet 350 carb pilot jet, idle jet Royal Enfield, carburetor low-speed jet RE, pilot carb jet 570840/A.