"Awesome. So I know you understand how a rifle works, we'll work from there. Ignite the powder, explosion, the power pushes the slug out, right? Switch the powder out for vaporized petrol and the ammunition for a piston."
She started to point out the engine's bits spread out on the floor. "The piston is pushed out, it's connected to an arm that is connected to the motor. The arm pumps the motor and the motor turns a bit. If you have a few in delayed concert, four or six, to go off one after the other, bam-bam-bam-bam, you have the combustion cycle of your bike. That's the heart of the bike."