Install video on youtube https://www.youtube.com/watch?v=QuKAxnktGNc&feature=youtube_gdata_player Ignition Coil Superior Ikeda & NGK For Eton 41.5cc engine. This coil replaces problematic factory green ignition coil. Not for electric start models, (40e).This is a non factory ignition coil! The green coil factory system with the flywheel on the e-ton 40/41.5cc has a rpm counter tang that OFTEN comes loose from the flywheel, damaging the flywheel and coils and covers and even crankcase & crankshafts in some cases. This "tang" communicates with trigger module and governor. The factory system is very problematic and a higher rpm grenade time bomb.�Please watch the informative video on YouTube that explains this NEW coil. Remove the yellow metal tang from flywheel and never see another grenaded flywheel with this NEW coil. Also you can remove factory trigger module & govenor as they are no longer needed. Coil adjustment Shim card included. Ikeda coil wiring harness and NGK spark plug included. Follow link above to watch how to install this coil & improve your ignition system OR go to www.YouTube.com and look for scootr.com or hsing hua 172197