Universal Parts 110cc Honda Style Cylinder Head Gasket Cylinder Head Gasket for 49cc to 125cc Honda style, horizontal cylinder engines. Choose from 49cc, 70cc, 90cc, 100cc, 110cc and 125cc sizes. This engine is commonly found on Dirt Bikes, Pit Bikes, ATVs and other racing or off-road vehicles. Bolt Hole Spacing: 68.5mm Inner Diameter (bore): 50cc - 42.4mm 70cc - 48.3mm 90cc - 51mm 100cc - 50.7mm 110cc - 51mm 125cc - 53.4mm