Any Plug with an "R" at the beginning of the part number denotes that it is a "resistor" type plug.... Searched all small engine shops in Atlanta area, none available....A local hobby shop did have 2 champion RJY something that I put in my Homie chainsaw engine, and had absolutely no interferance....Before, I went as far as aluminum taping every single wire in the airframe (except the receiver wire of course) to include the plug wire all the way up to the boot, in an effort to get rid of my interferance....the "R" plug (and grounding the coil) fixxed it.....