O.S. Engines 2A003000 Speed R2101 Cylinder and Piston Assembly FEATURES: Restores proper compression to worn or overheated engines Machined and matched piston and cylinder for precision tolerance INCLUDES: Piston, key #4-1 Cylinder, key #4 jxs 05/12/14 ir/jxs INCLUDES: Piston, key #4-1 Cylinder, key #4 jxs 05/12/14 ir/jxs