BS29 Carburettor – 576583/C → RLT00240/A (Superseded, Dual-Fuel E10/E20 Upgrade) for Classic 350, Standard 350 & Electra 350 – BS4 UCE

This page refers to the legacy BS29 carburettor – 576583/C used on Royal Enfield 350cc BS4 UCE models (Classic 350, Standard 350, Electra 350).
Status: 576583/C has been discontinued/superseded by Royal Enfield. The official replacement is RLT00240/A, a dual-fuel (E10/E20) compatible BS29 carburettor that keeps OE jetting and fitment while adding ethanol-blend resilience.

If you place an order for 576583/C, we will supply the superseding part RLT00240/A to ensure correct, future-ready performance. Installation remains plug-and-play with your stock manifold, air box, and throttle/choke cables, delivering stable idle, clean throttle response, and easy starts—without fabrication or guesswork.

Every unit shipped by Under The Hood is QC-checked, sealed in OE packaging, billed with a GST invoice, and packed safely to reach you in perfect condition.

Key Features

• Supersession: 576583/C → RLT00240/A (official Royal Enfield upgrade)

• Dual-fuel ready: RLT00240/A validated for E10 & E20 use

• Retains OE BS29 geometry & factory jetting; smooth, reliable fueling

• Direct bolt-on: manifold/air box/cables remain stock

• Under The Hood QC, GST invoice, safe packaging

Compatibility Table 

Exclusions: BS3 carb models, 

Variants

• RLT00240/A – BS29 Carburettor (Dual-Fuel E10/E20) – Successor (recommended & shipped)

FAQs

Q1. Can I still buy 576583/C?
Royal Enfield has phased it out. Orders are fulfilled with the superseding RLT00240/A.

Q2. Is the new part plug-and-play?
Yes. Same BS29 fitment on BS4 350 UCE with stock manifold/air box/cables.

Q3. Does RLT00240/A need re-jetting?
OE-jetted. Most stock bikes won’t need changes; fine-tune only for altitude or intake/exhaust mods.

Q4. Is it E20 compatible?
Yes. RLT00240/A is validated for E10 and E20 fuels.