I need to understand this a little better tHen I do. I have a long rod and a stock cylinder 87 I beleive. no spacer plate so what piston do I have? I am going to to do a rebuild soon, what should I run with my long rod, seems all my friends bikes that have work done have the spacer plate I am guessing my cylinder is an 87 and is diffrent from the 88 89 and if I put what ever piston I do not have in there I will need a spacer plate.