The utility model relates to the technical field of motorcycle components, and aims to provide an engine and a motorcycle. The utility model provides an engine which comprises a crankshaft, a cam shaft, a motor, an oil pump and a water pump. The crankshaft and the cam shaft are both arranged in the crankcase, namely the cam shaft is an underneath type cam shaft and is in transmission connection with the crankshaft, and when the crankshaft is driven by the piston to rotate, the cam shaft rotates along with the crankshaft. The motor is in transmission connection with the crankshaft, and the oilpump is in transmission connection with the crankshaft. The water pump and the oil pump are arranged to be in transmission through the underneath type cam shaft, and the oil pump is arranged to be indirect transmission through the crankshaft, so that the water pump and the oil pump are arranged on the same side of the crankcase on the premise that the size of the crankcase is not changed, and thestructure is compact; And the water pump, the oil pump and the motor do not interfere with one another in the working process, and the layout is more reasonable.