Test results.

I have flown the Pathfinder/Evo .52 combo several times and the burp is gone. The plug in the bypass port did the trick. I have it's bigger brother the Evo .60 on another profile plane and flew that just to see if it had the burp but it didn't. I really like the way the .52 flys the plane. I even made up a set of lines using stronger .018 dia. cable. Still 62 feet long.