Motorcycle YX125 52.4mm Piston 13mm Pin Piston Gasket Set For Yinxiang 125cc 153FMI engine Apollo Small MX 125 YCF Pit Dirt Bike This piston and gasket set is designed for use with the YX125 model featuring a 52.4mm bore and 13mm wrist pin.It includes a replacement piston, piston pin, piston rings, and necessary gaskets for the 153FMI engine platform.Compatible with Yinxiang 125cc engines used in Apollo Small MX 125, YCF, and similar pit and dirt bike models.The set supports engine rebuilds or performance where standard dimensions are required.Components are machined to match specifications for proper fitment and function within the engine cylinder. Disclaimer of Affiliation: This is an aftermarket component.Brand and model mentions are for illustrative compatibility only.