The thump of the Royal Enfield Bullet 350's single cylinder engine is a highly recognizable sound and feel of the motorcycle. The noise is not all of it, of course, but the low end torque and the way the engines pulses hit you through the entire bike. Since the Bullet 650 is now moving to a parallel twin 650cc engine there is a lot of interest, and concern, in how the engine character of the Bullet 650 will compare. Will it have any of that signature Bullet feel, or will it be entirely different to ride? It’s a worry to some purists that the Bullet will lose its soul by losing the thump, and others are looking forward to a smoother and more powerful ride. Royal Enfield's tuning of the 650 twin for the Bullet could have a big part to play in whether it wins over old fans or new riders.