I recently added a new O.S. 55AX to my Ultrasport Plus, I mounted it inverted and added an onboard ignition system. I am using 15% nitro fuel with 18% oil and a O.S. 8 glow plug. I am trying to get the engine running properly but I'm running into many issues. First of all, the carburetor seems to flood often, when I do get the engine running, I advance the throttle and it quits once the ignition system turns off. I've adjusted the high-end needle valve to the lean side but it's still giving me a lot of issues, spitting out a lot of unburned fuel, etc. I was told to run a 3-line fuel tank, use 30% nitro, use an O.S. F plug and lean out the idle screw. I don't fully understand the 3 line fuel tank, running two clunks, one to the muffler, one to the carburetor and plug the vent line.

Any helpful suggestions would be greatly appreciated.

Bill