I have a Snapper LT-16 that started running rough about a year after having it rebuilt. After messing around for a little while (and getting "zapped") I figured out that I have a bad plug wire. I believe these 2 cylinger Briggs have an assembly that I'll need to replaced the coil and plug wires, as you can't just replace a plug wire on them. Any easy way to remove the rear cover to get to the coil? Or am I going to have the drop the drive shaft?