I bought a new MVVS 58cc engine and the manual was not int the box. I have made several calls and was promised I would be sent a manual, but I still do not have one. I need some help understand what each of the 3 nipples on the carburetor are for. Several folks at my club say the black one should be the gas line from the tank, which I believe is correct. What are the other 2 for? Any help would be appreciated, since I am ready to fly this engine. Also would like some info on the break-in procedure.