New to me.....99 Polaris trailblazer 250 Carb leaking (Unless valved out) constantly, even while riding. through Overflow tube. The tube has a T fitting halfway down the length that is open on the side and has a small plastic disk on the lowest end. What is that ? will disassemble the carb and soak in carb cleaner in a day or so. Anything "goofy" about taking this apart?