When you get a new flywheel you got to remember not all ryobi flywheels are the same. there is a narrow key and a wide key flywheel. one uses the half moon key and the other type has the key cast into the flywheel. also there are flywheels made by phelon and some mace by walbro. why is that important to note? Because they have different timming in them depending on who made them and you need the coil that matches that timming. so now the question is: What flywheel do you have?????