Wiseco Piston Kit for Yamaha RT100 1990 2003 53mm STD Comp eBay Wiseco Forged Piston Kit 49mm for '83 88 Kawasaki KDX80 '84 85 KX80 Shop High Quality Yamaha XS1100 Wiseco Piston Kit Piston Kits Wiseco 03 06 Kawasaki KFX400 Standard 90.00mm Bore Wiseco Piston Kit 12.2:1. Classic Forged 2 stroke pistons are perfect for those looking to rebuild their 2 stroke engine with reliable, high quality components. These pistons cover a wide range of Powersports rebuilds, including vintage motocross models, classic street bikes, and snowmobiles. The forged material improves tensile strength over cast pistons, ensuring refreshed performance on the track or the trail. This Part Fits: Year Make Model Submodel 1996 2003 Kawasaki JH1100 1100ZXi Base 1997 1999 Kawasaki JT1100 1100STX Base