91MM Motorcycle Piston Ring Kit For Hisun 800 800cc ATV 13101-010-0000, 13111-010-0000 This piston ring kit is designed for use with 91mm bore engines, specifically compatible with Hisun 800 800cc ATV models.The set includes all necessary piston rings to ensure proper cylinder sealing and engine performance.Engineered to meet specifications, the rings are constructed from materials to withstand operating temperatures and pressures.This kit supports effective compression retention and oil control within the engine cylinder.It is intended for replacement or rebuild applications where piston ring wear has occurred.Installation requires standard mechanical tools and knowledge of engine assembly procedures.