Yes, it is common for motorcycles to have fuel tanks mounted on them. The fuel tank is an essential component of a motorcycle, as it stores the fuel needed for the engine to operate. The tank is typically located between the rider's legs or towards the front or rear of the motorcycle, depending on the design.
Fuel tanks on motorcycles are designed to be compact and aerodynamic, taking into consideration factors such as weight distribution and handling. They are usually made of materials like steel or plastic to be lightweight and durable. The size of the fuel tank varies depending on the motorcycle model and its intended purpose, with some tanks having larger capacities for long-distance riding, while others are smaller for more lightweight or sporty motorcycles.
It's worth noting that modifying a motorcycle by adding or altering the fuel tank can have implications for the bike's balance, performance, and safety. Therefore, any modifications to a motorcycle's fuel system should be done with caution and in compliance with local regulations and safety standards.