A Magneto/Stator is an electrical generator that uses permanent magnets to produce periodic pulses of alternating current to provide power to the spark plug(s). In some engine styles the stator can be located in an area that a derailed chain can cause damage to the stator and engine cover requiring replacement. Stators can also fail due to a number of reasons including shorts, water damage etc. If you are not generating power from your engine we recommend testing your stator to see if it needs replacement.