HS500 83.5mm Piston Ring Circlips Pin Set For Hisun Massimo Bennche Qlink 500cc ATV Quad This piston ring circlip and pin set is designed for use with 83.5mm bore engines in select 500cc ATV and quad models.Compatible with HS500 engines found in Hisun, Massimo, Bennche, and Qlink vehicles, the set includes all necessary components for piston assembly.The circlips secure the wrist pin in place while maintaining proper alignment within the piston.Constructed to meet standard specifications, this set supports engine rebuilds and replacements.Each part is sized to fit designated engine configurations and functions as a direct replacement for.