Is this compatible with a Honda GCV 160 on a Flymo XL500 mower? Barcodes GCV 160A0 A7Q1 NH1 and GJAPA 2648354, engine family: G20D54S0160K1A GVC160A-E0

This carb will not fit your model. According to your serial number you require part number 16100 Z8B 881 https://www.lsengineers.co.uk/carburettor-assembly-genuine-honda-part-16100-z8b-881.html