Then you get into planes with cowled engines and you can't see the fuel or get A finger on the carb or muffler, it's always something isn't it.
Most of my glow engines are four stroke and hidden under A cowl. I have learned over time that there is A squishy sound they make when they are ready to fire and other then the winter months they start right up every time. My YS engines are the engines I learned this from, because of the pressure system they use that sound is the key to always getting them to fire with the back snap the first time. They only give you one chance to look cool before you have to reach for the starter.[8D]