Exciter stator coil compatible with 9.9HP, 15HP, and 18HP engines.Fits models M15D2, M9.9D, M9.9D2, M18E2, NS9.9D, NS9.9D2, NS15D, NS15D2, NS18E, and NS18E2.Designed to generate electrical power for ignition and systems.Constructed with copper windings and insulation for performance.Installs directly as a replacement part.