ok I am replacing my stock piston(99 yz400) with a weiseco piston kit....there are three rings, the bottom oil ring is easy to identify but the instructions in the kit do not tell me which is the top ring and which is the second ring? they are clearly different one is more like black and the other is like an orangy color?? which one is the top and which one is second ring?? also what are the fuctions of the top right and second ring? I think someone told me one of the rings srapes the oil back down off the cylinder wall....im new to changing out my piston....just don't know what ring is top or second.... can anyone answer this for me?