I had an inverted engine that wasn't much of a problem. Don't prime it. Just put the glow driver on it and start spinning it. It will fire as soon as the fuel hits. I had mine rigged where I could reach the fuel line with a hemostat. I fueled it thru the disconnected carb. line. Finger starting may be a bit more of a challenge, but wear a glove and flip with force in case of a backfire. I also have closed the needle when using a T fitting. Just count the turns and open it back to the same setting. With practice you will get so close to the original setting it won't matter to the engine. To prevent siphoning just don't fuel it until you are ready to fly or leave the needle closed.