Royal Enfield Introduces E20 Retrofit Kits For Older BS3,BS4 Models
KEY HIGHLIGHTS
- E20 retrofit kits introduced for BS3 and BS4 carburetted 350cc UCE models
- Kit includes ethanol-resistant fuel lines, O-rings, seals and gaskets
- Available at authorised Royal Enfield service centres; pricing ranges between Rs 1,700-3,000 (approx.)
With India steadily moving towards higher ethanol-blended fuel, Royal Enfield has introduced E20 retrofit conversion kits for select older motorcycles. The kits are designed specifically for BS3 and BS4 carburetted Unit Construction Engine (UCE) models, including the Royal Enfield Classic 350, Royal Enfield Bullet 350, and Thunderbird 350. While Royal Enfield's BS6 portfolio has been E20-compliant since 2020, these retrofit kits aim to safeguard older carburetted motorcycles from long-term compatibility issues associated with 20 percent ethanol-blended petrol. Read on to find out more details, but before that, make sure to join the 91wheels WhatsApp Community, specifically curated for petrolheads like us to keep up with the latest news and automotive updates.
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Royal Enfield E20 Kits: Why The E20 Kit Matters
Higher ethanol content in modern fuel can accelerate the deterioration of rubber components and certain metal parts in older fuel systems. Carburettor-equipped UCE engines, particularly those from the BS3 and BS4 era, are more susceptible to wear over time when exposed to E20 fuel. The retrofit kit addresses these concerns by replacing vulnerable components with ethanol-resistant alternatives. These include upgraded fuel lines, O-rings, gaskets, seals, and related rubber elements designed to withstand prolonged exposure to higher ethanol content. The goal is to reduce the risk of fuel leaks, swelling, or potential blockages in the system. As per reports, pricing for the E20 conversion kit varies slightly. Some service centres quote approximately Rs 1,700 for BS4 models, while others indicate a total cost of around Rs 3,000, with an additional installation charge of roughly Rs 300.
The kits are available exclusively through authorised Royal Enfield service centres. However, availability may vary by location, and owners are advised to confirm stock with their preferred workshop before scheduling installation.
What About Other Models?
Currently, the E20 retrofit kits are intended only for BS3 and BS4 350cc carburetted UCE motorcycles. There is no dedicated retrofit package for 500cc UCE engines, although some service centres recommend proactively upgrading select fuel system components as a precaution. Fuel-injected models powered by the newer J-series 350 engine, as well as the 410cc and 650cc platforms, are already compliant and do not require additional modifications.
Verdict
The introduction of E20 retrofit kits is a pragmatic move from Royal Enfield, especially given the large number of older Classic, Bullet, and Thunderbird models still on Indian roads. Rather than forcing owners into premature upgrades, the brand is offering a relatively affordable way to extend the life of these motorcycles in an evolving fuel landscape. For owners of carburetted BS3 and BS4 350cc UCE models, this retrofit could prove to be a sensible preventive measure, particularly in regions where E20 fuel availability is expanding rapidly.
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