your taking an unnecessary chance putting a servo near a gasser. even if it is at idle, it is still a direct connection to your rx. all gas engine manufacturers ,of engines that i've used over the years, state in their installation instructions to give AS MUCH SEPARATION AS IS POSSIBLE to engine and rx circuits. In addition to that, with engine, ign. batt.,ign. box, large prop & spinner, and a good size muffler all up front, you usually need to move components back anyway , to prevent adding dead weight. BE SMART....BE WISE....BE SAVE....BE SUCCESSFUL