Wiseco K1039 86-00 Kawasaki GTR1000/GPz1000RX Ninja 111 Piston KitWiseco K1039 86 00 Kawasaki GTR1000 GPz1000RX Ninja 111 Piston Kit 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