Wiseco 4393M08100 85-89 Honda ATC/TRX350 10.251 3189XG Piston KitWiseco 4393M08100 85 89 Honda ATC TRX350 10. 251 3189XG 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