2C7741.STD Piston Ring Set Fits John Deere Fits JD Tractors Crawlers B, BO,One New Aftermarket Replacement Piston Ring Set Fits John Deere (Fits JD) Two Cylinder Tractors and Crawlers This standard bore (STD) aftermarket piston ring set is a direct replacement for the original Fits John Deere 2C7741. STD ring set, designed for the classic two cylinder Fits John Deere Model B engine family. It restores compression and oil control in engines with standard (un rebored) cylinder bores, making it an essential part for engine