Guys the other day I put a new ngk plug and a xoar prop on my new DL-50. I started it up and it was running rough, so I tuned the high side and all was good, ran like a champ. The very next day I flew my new plane for the first time, but the engine was out of tune again. Any ideas why it would have done that? Im running Penzzoil 32:1, I made sure that the plug gap was rite also. Fill me in if you have any ideas. Oh, and by the way, with the engine sputtering like it was, it still pulled the Aeroworks Extra 260 vertical with no problem!!! Cant wait to see how it does with it runing just rite.