The Briggs & Stratton 691564 Motor-Starter 3-3/4" Case 15-Teeth Gear helps crank compatible engines to support reliable starting performance. Designed as a replacement starter motor, it converts electrical energy into mechanical rotation to turn the engine during startup. Its specified case size and 15-tooth gear are important for proper fit and engagement with the engine's starting s... https://www.wholetoolbox.com/briggs-stratton-691564-motor-starter-3-3-4-case-15-teeth-gear/691564.html