Great job Jim. Very nice plane, and great flying. It's neat to see a low wing plane built as a sport plane/tug instead of a high wing. I like it!

In the first video, I thought I heard some occasional rich misfiring, and was going to suggest a one screwdriver width adjustment leaner on both needles and see how it did. However, if you have tuned back and forth and can't get rid of it, then it probably is the ignition. Shot gun it. Replace the ignition, the sensor, and the spark plug, and bypass the ignition switch and run straight from a known good battery. But please, use a new CH or RCEXL, (or RCEXP), and not the Chinese Pegasus.

Great quality ignitions at both of these places:

http://www.rcextremepower.net/rcxpignitions.html

https://www.ch-ignitions.com/product...ns/single-cdi/

Good luck, you'll get it there.

AV8TOR