Vertex
Vertex Piston Kit YZ450F 20-22/WR450F 21-23/XXF450 22-24 H/C Compression 13.8:1 (96.96)
Vertex Piston Kit YZ450F 20-22/WR450F 21-23/XXF450 22-24 H/C Compression 13.8:1 (96.96) Product Info: Exact fit A, B, or C pistons match your cylinder bore perfectly