Motorcycle engines work the same way as car engines. They consist of a piston, cylinder block and head, which contains a valve (valve). The piston moves up and down the cylinder block, driven by an explosion of a mixture of fuel and air that has been ignited by a spark (spark plug).

The valve opens and closes to allow a mixture of fuel and air entering the combustion chamber. The piston moves up and down, turning the crankshaft, which converts the energy from the piston into a rotary motion.

The rotating power of the crankshaft is transmitted to the rear wheels of the motorcycle after going through the "transmission line".

Simple: The energy of the drive from the combustion results is converted into a straight motion by the rise and fall of the piston. Then this straight motion is transformed into a rotary motion (because the wheel requires rotating motion, not straight) by the crankshaft. In the end after going through the transmission and chain / CVT, this style moves the wheels.

Explosion energy-> piston straight motion-> crankshaft rotational motion-> transmission-> wheels.