70mm 16mm water-cooling piston ring kit for CB250 xmotos apollo kayo bse dirt pit bicycle parts.This piston ring kit is designed to fit engines requiring a 70mm bore and 16mm piston pin diameter with water-cooling compatibility.Suitable for use in various small displacement two-stroke or four-stroke engines found in dirt bikes, pit bikes, and similar applications.The kit includes piston rings and related components necessary for piston assembly replacement.Made from materials to withstand operating temperatures and pressures.Compatible with standard 70mm cylinder bores and 16mm wrist pins used in specified models. Compatibility Disclaimer: This is an aftermarket replacement part.Any brand names or model designations mentioned are used solely for the purpose of demonstrating compatibility.