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Royal Enfield unveils its 1st modern 650 Twin engine

By Niranjan Mudholkar,

Added 06 November 2017

The new platform is a 4 stroke, single overhead cam, air-cooled, 648cc parallel twin cylinder engine developed by Royal Enfield’s UK Technology Centre and Chennai teams.

Royal Enfield’s UK Technology Centre. The Centre played a key role in the development of the new engine.

The engine maintains an under-stressed 9.5:1 compression ratio and the fuel injection system ensures that smooth, accessible power is available at all times. The focus of the development was on giving adequate torque, spread broadly throughout the rev range so that riders can tap into it instantly at anytime without the need for excessive shifting.

As a result the engine feels fun, potent, and easy-to-use. Making this possible are a number of elements, starting in the very depths of the engine where there is a single-piece forged crankshaft (a first for Royal Enfield) which ensures strength and the ability to handle the twin's torque. This crankshaft uses a 270-degree firing order, which gives a high degree of character to the engine's power delivery. Also, thanks to the use of a balancer shaft, unwelcome vibrations have been eliminated.

The entire platform, including the engine and chassis have undergone rigorous testing during the development programme. It has been subjected to lab and bench tests, in addition to being tested on proving grounds, race tracks and public roads.

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