Hi this is the second time this happens to my heli I just started working on a kalt AH-1G Cobra and I installed an OS 61 rear exhaust engine and due to lack of space I'm using an after market exhaust like the tatoone or pitts muffler, the sound is too loud and I noticed that the throtle servo shakes like its receiving interference when the engine is running and works fine no movement at all when the engine stopped, I checked the servo arm, the servo screws it seems like the sound of the muffler is causing this problem. I checked the battery and the receiver, both were just used in an airplane, the radio system is the Futaba super 8 with receiver 148fp is there any suggestions?
thank you?