Royal Enfield Taurus Motorcycle with Diesel Engine (India)
This is a very rare version of the "Bullet" equipped with a diesel engine.
The exact engine size (displacement) is 325cc, i.e.slightly less than the 350cc of the standard bullet gasoline engine.
The large shiny part with small holes on the right side of the engine is a fan case. A fan has been added to cool down the diesel motor (possibly an engine oil cooling system?).