Cylinder Kit with Piston Ring Pin Set For HISUN 400CC HS400 Hisun400 ATV UTV 2100-003-0000 This cylinder kit is designed for compatibility with HISUN 400CC models including HS400 ATV and UTV.It includes a cylinder, piston, piston rings, and wrist pin to support engine rebuilds or performance.The components are engineered to meet specifications for proper fit and function.Intended for use in 4-stroke engines, the kit provides a complete solution for replacing worn or damaged internal parts.Suitable for use during routine maintenance or repair following engine diagnostics. Compatibility Disclaimer: This is an aftermarket replacement part.Any brand names or model designations mentioned are used solely for the purpose of demonstrating compatibility.