Wiseco K11051 72-75 Kawasaki KZ900/77-82 1000 10.25:1 CR PistonWiseco K11051 72 75 Kawasaki KZ900 77 82 1000 10. 25: 1 CR Piston The Wiseco team has remained at the forefront of powersports performance through every era and evolution, including the development of high performance 4 strokes. Today, Wisecos forged 4 stroke pistons are designed for each specific engine application and built to the tightest tolerances for the ultimate combination of performance and strength. Proven at every level of riding, Wiseco 4