I got this engine and to tell the truth, I know nothing about ys engines. My question. It did not come with a muffler, where can I get one? I will post a couple of pictures. On the engine there is a inlet with a red covering on it. What is that for? The picture in the 1 page manual shows that the vent line in not connected to the engine. It that vent line, just that a vent. Like I would have on my gas engines? Sorry for all the questions, just not familiar with YS.