125cc cylinder kit, 54mm bore, piston ring kit, suitable for off-road vehicles, quad engine modification and upgrade, motorcycle engine repair parts.--BIEMMEDUE

Key features and performance modifications: It uses a larger cylinder bore of 54 mm, which is commonly used to improve the original 110-125 cm³ engine with a cylinder bore of approximately 52.4 mm to a larger displacement (close to 125-135 cm³), resulting in a significant increase in power.