If your motor is brandnew there is no need to worry about the plug. I believe you may have the prop set at an improper position and may not be able to accelerate the magnets on the flywheel over the coil fast enough. I also assume that you have teh G-38 in a hanging position. If so it can easily flood the cylinder when you prime too much and thus "drowning" the plug. Does your G-38 have a choke on its carb? If yes, all it takes is to close the choke, flip the prop several times until the engine pops. Then open the choke and flip the prop from a two o'clock position as fast as you can to your left. She should fire up now. If not then there is not enough gas inside the cylinder. In any case, a powerful electric starter is always a good idea to have.