Wiseco Piston for 2.678" bore. This is the stock bore on a GX200, GX160, and the 196cc Clones. Can also be used on a Briggs & Stratton 5HP flathead as a +.115" Compression Height is .640" Comes with rings and circlips, No Pin. This piston requires a .490" diameter wrist pin. Check out ARC's #6521 High Performance wrist pin.