Honda 71-73 CB500 CB500K Piston Kit - 4 Kits - .25mm Oversize - 56.25mmHonda 71 73 CB500 CB500K Piston Kit 4 Kits 0. 25mm Oversize 56. 25mm New reproduction piston and ring kits. Pistons are cast and replicate original pistons. Includes 4 Pistons 0. 25mm Oversize or 56. 25mm 4 Rings Sets 0. 25mm Oversize 4 Piston Pins 8 Piston Clips Ring Installation Chrome ring on top with "R" up. Beveled black ring is second ring with "R" up. Bottom ring is 3 piece. Be sure not to overlap ends of middle ring. Part # = 13102 323 405