Hello! I just got this bike a little while ago, fixed a few issues with fuel/air mixture and warping wheels. I don't know exactly what size engine it is, I'm guessing its 60cc... anyways, I want to start modding the engine, and so far this is my plan: A 36T sprocket Performance carb I'll probably make a custom exhaust I have one question though, the black part on the carb, is this an air intake or an outlet of some sort? Can I put an air filter on it rather then use that thing? it seems very inefficient.