Although in the hobby for years, this is my first gas build. Question ... My field friends tell me I should not have run a solid 4-40 rod from carb, past engine EIS ignition to servo because that will transmit EMI or noise to my receiver, which is a Futaba FM. I chose to stay with FM rather than go to PCM because I have never in 15 years or so had any problem what-so-ever with FM. I have set up a solid, no "slop", ball joint connected push rod that I really like. Must I change this to Nirod or Golden Rod to eliminate noise, or am I good to go ? I really like my set up, but..... Engine is a Fuji Imvac 43 on a giant Aeromaster bipe. Really nice... I have flown it three times so far.

....your friend might be right. The glitch is coming from somewhere. I would replace the
linkage with a Ny-rod and see if the glitch disappears.

FBD.

If you have several flight already and no glitches, what is the question? It works so go with it. However, your friend is correct in saying that such a set up will be much more apt to cause problems than a non conductive push rod would cause. A far more probable cause of interferance is any metal to metal contacts that can vibrate or rub against each other.