How do you test the Pick up coil on a Yamaha Warrior?

First you need to unplug the two plugs coming out of the stator, you will see one with three prong holes: that's for the source coil and the other has four that is where you check your pickup coil, depending on what year you have, there will be two coils on the early years 87- maybe up to 90 or 92, after that just a single onward. The color coding on the wires you will have to get out of a Yamaha factory manual, to figure out which coil is bad, the Clymer manual won't show you the color to each coil.