BS3 or BS4 Royal Enfield: With the background of growing ethanol content in petrol in India the Royal Enfield E20 Conversion Kit has been introduced. This kit is specifically intended to fit the popular models, namely the Classic 350, Bullet 350 and Thunderbird 350, which have BS3 and BS4 engines.
The government is also introducing E20 fuel (petrol that is mixed with 20 percent ethanol) in the country. This is a development that can strain other older engines and their fuel system components. Royal Enfield has implemented an official retrofit solution to solve this problem.
What is the E20 Fuel and what is the Conversion Kit?
Ethanol is mixed in up to 20 percent in E20 fuel. It is said to be environmentally friendly and is a move towards the need to eliminate overreliance on imported oil. Nevertheless, the use of E20 fuel may lead to long-term damage to bikes with older rubber seals, fuel lines and carburettor systems.

Some of the components of older BS3 and BS4 unit-construction engine models are not entirely ethanol-resistant. This may result into fuel leakage, gasket damage, or even blockage of carburettors. Royal Enfield E20 Conversion Kit has specifically been created to help eliminate this risk.
What mobiles have the Royal Enfield E20 Conversion Kit?
The following models are the main models in which this kit can be found:
– Royal Enfield Classic (BS3/BS4) 350.
– Royal Enfield Bullet 350 (BS3 and BS4)
– Royal Enfield Thunderbird 350 (BS3 and BS4)
All these are unit-construction engines that are driven by carburetor-based engines. The impact of fuel containing ethanol is more evident in these engines and hence this kit is quite convenient in these bikes.
The Royal Enfield E20 Conversion Kit replaces the following:
This conversion kit will substitute important fuel system components with ones that are resistant to ethanol. It has improved fuel runways, seal of a higher quality, new gaskets, and other necessary components.
These are the elements created to make sure that its operation on E20 is safe on the long term. The company only recommends that the kit should be installed in an authorised service centre to ensure that they are fitting well and that they are complying with the warranty.
What is its price and the cost of installation?

The information available states that Royal Enfield E20 Conversion Kit costs around 1700 in the case of BS4 models. BS3 models, or models which need further carburetor improvements, can be slightly more expensive.
You should also call your closest Royal Enfield authorised service centre before driving to a service centre as there might be a shortage or excess of stocks depending on the city.
Will it affect mileage?
This kit enhances the compatibility of fuels and the long-term reliability; however, the slight loss of miles produced by the ethanol mix cannot be totally removed. However, this option will save the engine and prepare the bike to the future standards of fuel.
Overall, it is a viable and formal proposal to Royal Enfield owners of older bikes, which allows them to ride safely without significant issues.
Closure: A wise decision among the elderly Royal Enfield owners
The Royal Enfield E20 Conversion Kit is a blessing to the riders who desire to continue using their BS3 or BS4 Classic 350, Bullet 350, and Thunderbird 350. In a time where blends of ethanol are on the rise, this kit is a simple means of future-proofing the fuel system.
In case you have one of these models, it may be a prudent step to go to an authorised service centre and upgrade the model.
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