Ban Jing 58.5mm Ceramic Big Bore Kit with Nikasil Cylinder Coating for 150cc and 125cc GY6 4-stroke engines and engine based vehicles. Easy to install! Just bolt on with no crankcase modifications needed.

• Bore: 58.5mm
• Overall Height (cylinder): 90mm
• Heat Resistant Ceramic Coating
• Nikasil Interior for Reduced Friction and Low Wear

GY6 QMI/QMJ 152/157, Various unlisted makes/mode