Problem SOLVED What electrical part on a 95 Yz125 would cause the spark plug to work sometimes and not do all the other times?

Answer 1

the stator, coil or CDI box Check all electrical connectors, unplug each one, and add some grease to contacts after cleaning if neccessary.

if it works sometimes then i would look for the simple fix, check all connections etc, see if maybe the wires are frayed etc, if its worked b4 it will work again, or if daddy is paying just buy new parts