Shineray XY125GY-5E Big Bore 150cc Barrel & Piston Top End Kit Upgrade

New Big Bore 150cc Barrel and Piston Kit Upgrade. To upgrade your 125cc Engine to a 150cc. with 15mm Piston Pins. Piston Ring Set ?. Pre installed. Piston Pin. Piston Circlip x2. Has the cut out for models with Balance shaft if required.