A very good video indeed. One point to be clarified is the creation of spark inside spark plug which is a component of ignition system. High voltage overcome the dielectric strength of gases between electrodes. These gases are ionized and change into conductor and thereby producing final spark....
In this system what is the function of ignition switch...my dout is the primary circuit is completed by contact breaker...bu what is a function of a switch is here
right but that is not correct the magneto spinning creats voltage not gd as the magnet on the flywheel spin it greates a voltage and steps it up to high voltage due to turns ratio to go to spark plug