the os 18 cv-rx is not a turbo, what makes it a turbo is the head button, also, the hpi 15fe wasnt the greatest engine, to give you a hint at how reliable an OS is with a pull start, i took it out one day, pull the cord 3 or 4 times and it started, so i give it throttle, the carb opens all the way and the rpm JUST BARELY rasies (i just mixed my first batch of fuel) and it was running over a full turn rich and still idling with no problem, if i can get an os 18 cv-rx to start at over a full turn rich, then you should be able to too, the pull start doesnt run outta batteries either