on my xyz engine w/ blue xyz ei module, my rudder was dancing to the rhythm of the slight low-stick burble...just the rudder channel...fortunately my fix was to separate ignition from radio leads as much as possible...now my rebuilt xyz has an rcexl ei unit w/ 3/4" plug (replacing the 5/8" bpmr6f)...starts in one or two flips, and no interference...i fly w/ fut 2.4...good luck...ken