This is a 2 set Cylinder I and II Piston Gasket Kit for the CF800cc engine used in 4 stroke liquid cooled models.The kit fits engine models with part numbers 0800-023100-0001 and 0800-023002.It is compatible with various CF800 series vehicles including ZForce Z8, UForce U8, and CForce 800 X8 models.Bore size is 90.96mm.This gasket set supports applications in ATV, UTV, and SSV variants from model years 2012 through 2018, including CF800-2, CF800-3, CF800ATR, CF800AU, CF800UTR, and CF800UU configurations.