Anybody have any experience with these engines. I just bought an Extra 300 with this motor on the plane. The guy started before I bought it and he was running that premixed super fuel. I already run 40:1 supreme pump gas in my son's DLE 111 and don't wanna pay the price for that super fuel. Went out today to start it for the first time after I got everything set up. All it does is spit, sputter, backfire, sometimes starts backwards. When it does start it runs for a short time, backfires and quits. Played with need valve some. It was close to 3 turns out. I have the manual , and I rest it back to factory settings at 1 3/4 turns. No change at all. Any help or advise would be appreciated.