Okay I am fairly new to this with my 2nd airplane. I have a magnum .25 engine and for some reason it will not start. When I turn it over with the power starter it sends fuel through the carb and at times it will lock the propeller and as soon as I drain it. It will spin the prop. I tried priming the engine before turning it over and it still keeps happening and I tried new glow plugs. Just running out of ideas on what it is. If anyone can help I would appreciate it.