A guy at our field has a ZDZ 50 CC and Rexcell Ignition. When the ignition wire is near or touching the muffler and he throttles up the controls surfaces go crazy. When he centers the ignition wire between the mufflers all is normal. He's using a Specktrum 2.4 reciever. We tried disconecting the throttle servo lead from the reciever and operate the throttle by hand and it does the same thing. Also disconnected his choke servo from the reciever, making no differance. Anyone have a cure for his ills?