NCY 88cc GY6 Big Bore Kit 2

Description

NCY High Quality All-Aluminum 88cc Big bore kit for your GY6 50cc scooter. Fits many QMB / QMA139 series engines. Typically about 50% of the time the cases need to be ground or machined to allow this cylinder to fit in. Cylinder skirt diameter is 54.5mm. Remove your existing cylinder and measure before purchasing. The most powerful kit available for a QMB139.