with a bike with a electronic ignition would need test equipment and crank engine to know, i think. an old bike that had points you be able to see which plug would get spark. and most of the time the lead are labeled.
the locating pins are to locate rings and to stop laterail movement.
the grooves house the rings and allow the pressure in the combustion cylinder to get behind the rings to form a seal.
this is all off the top of my head and may not be technically right.
the locating pins are to locate rings and to stop laterail movement.
the grooves house the rings and allow the pressure in the combustion cylinder to get behind the rings to form a seal.
this is all off the top of my head and may not be technically right.