No, motorcycles typically have their engines on one side, not on both sides. The engine is typically positioned between the rider's legs, with the crankshaft oriented longitudinally. This configuration is commonly known as a "transverse engine" setup.
The engine's cylinders and associated components, such as the cylinder head, intake, and exhaust systems, are positioned on one side of the motorcycle. The other side usually houses the transmission, clutch, and other drivetrain components.
Some motorcycles, particularly those with unconventional designs or specific engineering choices, may have engines positioned differently. For example, some bikes, like some BMW motorcycles, may have a longitudinal engine orientation with a driveshaft to the rear wheel, and the cylinders extend forward. These variations, though less common, exist to cater to specific design goals or engineering considerations.