WISECO ATV-DIRT BIKE PISTONS. ØAll Wiseco 4 cycle pistons come complete with rings, wrist pins and circlips. Ø Only Wiseco replacement ring sets can be used on Wiseco pistons. Ø All Wiseco 2 cycle pistons are supplied with rings and circlips. ØWiseco 2 cycle pistons are not supplied with a wrist pin unless noted in the description.