The BRIGGS & STRATTON 590603 Engine Magneto Armature generates the electrical spark needed for reliable engine ignition and operation. Designed as a replacement magneto armature, it fits compatible Briggs & Stratton engines to work with the flywheel magnets and ignition system. It works by producing electrical voltage as the flywheel rotates, delivering spark to the spark plug at the ... https://www.wholetoolbox.com/briggs-stratton-590603-engine-magneto-armature