BIG BORE Cylinder Kit 57mm Bore kit Upgrade to 150 cc for Benelli BJ125-3E TNT125 TNT135 TNT 125 135 154FMI-7 Kit Contains full cylinder kit matching BJ125-3E TNT125 TNT135 TNT 125 135 154FMI-7;supports 150cc displacement upgrade from size Comes with complete assembly accessories;aligns with mounting holes for direct fitting without extra Boosts engine displacement up to 150 cc;delivers stronger power output during daily riding acceleration Made with cast cylinder liner;adopts solid piston with smooth inner wall for steady operation Produced with standard 57mm bore dimension;every component follows unified measurement standards