i have bought a loncin 110cc 3 valve engine. All it came with was a carburator. no harness, or anything else. all i have to work with is 5 wires coming out of the engine. the wires are , green, yellow, blue, white, and a black, which one i am presuming the black is for the coil. i tried all 5 wires to a good coil, and good plug but i got no spark. i am guessing the points are fine, since it is a new engine. Can anyone give me some detailed information about the wires and why i have no spark? also, is this engine needing a 12v coil? thanks!