HS400 Piston Ring Circlips Pin Set For Hisun Massimo Bennche Qlink 400cc ATV Quad This piston ring circlip and pin set is designed for use with HS400 engines found in select Hisun, Massimo, Bennche, and Qlink 400cc ATV and quad models.The set includes piston rings, circlips, and wrist pins necessary for piston assembly and engine repair.Components are engineered to meet specifications for proper fit and function.This kit supports rebuilds and replacements during routine maintenance or performance.compatibility with your specific model before installation.Disclaimer: This replacement is not affiliated with any manufacturer.Model references indicate fitment only.