Yamaha TZR125 1987-1992 Cylinder Barrel Piston Kit? Features: If your cylinder blows through, the compression is too low, or even a piston seizure has occurred, then this kit is exactly the right thing for you to upgrade. Kit includes cylinder, piston, rings, pin, clips.(you get exactly what is pictured). Kit is for standard bore size 56. 4 mm x 50. 0mm stroke, 16mm steel piston pin. This kit is excellent as a low cost replacement for defects in the original cylinder. Specifications: Condition: