The Royal Enfield 500cc motorcycles, such as the Classic 500 and Bullet 500, are typically equipped with a single-cylinder, air-cooled engine. These engines are based on a design known as the "Unit Construction Engine" (UCE), which is a modern iteration of the classic Royal Enfield engine.
The UCE engine features a capacity of 499cc and is known for its robustness and torquey performance. It utilizes a single overhead camshaft (SOHC) and a pushrod valve actuation system. This type of engine design is well-suited for cruising and offers a distinct, thumping exhaust note that is characteristic of Royal Enfield motorcycles.
While the exact specifications and design of the engine may vary slightly across different models and years, the Royal Enfield 500cc motorcycles generally share these fundamental features. It's always recommended to consult the specific model's documentation or official Royal Enfield sources for precise details on engine specifications.