How do you change a 1997 cr125 piston?

To change the piston on a 1997 Honda CR125, first, remove the cylinder by taking off the exhaust and intake, then unscrewing the cylinder head bolts. Once the cylinder is off, remove the old piston by taking out the circlips and the wrist pin. Install the new piston onto the connecting rod, ensuring it's oriented correctly, and reassemble everything by reversing the disassembly steps, making sure to torque the cylinder head bolts to the manufacturer's specifications. Finally, check the oil and coolant levels before starting the engine.