is the oldest motorcycle brand in the world still in production, with the Bullet model enjoying the longest motorcycle production run of all time Royal Enfield added new variants of the Classic 350 and 500 motorcycles. Enfield has unveiled the 650 cc twin-cylinder engine at the Technology Centre in Leicestershire, England, on November 2017. This will power the next generation of Royal Enfield motorcyclesItaly. Royal Enfield is going to showcase is at the EICMA (Milan Motorcycle Show starting from November 7 in .The new engine is a complete ground up effort and the company stresses that it has nothing to do with the firm’s existing single cylinder engines.The 648cc engine will be air-cooled to stick with Royal Enfield’s heritage and the cases have been designed after the Mark II Interceptor. An oil cooler is employed for additional engine thermal management. Bore and stroke are 78mmx67.8mm and the engine uses a four valve SOHC layout and a 270-degree forged crank. The 270-degree firing order helps balance secondary vibrations while a balancer shafts takes care of primary vibrations. Power is sent to the rear wheel via a new 6-speed transmission that uses a slip assist clutch for easier modulation. The clutch is a heavy duty unit, as is the alternator which is beefed up to handle the additional load from running any accessories. Interesting, after googled and compared it with some competition, If priced low it would compete with the 390 if Priced high then the Ninja. 650 twin made to compete in price with single cylinder 390cc is a tall ask. I think the bikes hosting this engine will be definitely above N300, so above 4.5-5 lakh at least, if not even more.Triumph s Bonneville T100 makes about 54 bhp with an 865 cc engine in spite of being liquid cooled, granted it makes about 80 Nm of torque. I think the new RE 650 may fit well into this modern retro niche as Triumph calls it. The main issue here is that RE is not known for its QC. If that can be taken care of (that s a pretty big if) then they might have a decent product that potential T100 buyers may consider, if priced well.