I'm a flying female who never took shop in high school. But i love rc planes. Have a Saito 100 in a Tiger 60. There is a lot of oil in the cowl 'area' after flying. Does the breather nipple drip out excess fuel, or does it just 'breathe'? Could there be a leak somewhere, and where would that likely occur? I've checked around the fuel tank, all foam is dry. Maybe this is just all normal?