Kohler part number 25 874 13-S is a Piston Assembly With Rings, Wrist Pin, Clips. Standard Bore 83mm, 67mm Stroke, 725cc, Style B, 1.2 mm Top Ring Thickness. 2587413-S. Fits many specs of Kohler CH25, CV25, CH/CV725, CH/CV730, CH/CV740, SV710-740, SV810-840 series engines. Please refer to the documentation for your engine to ensure you order the correct part.