125cc cylinder head / engine head assembly. 4-stroke 125cc air-cooled profile is used for most engine brands commonly found in Chinese ATVs, go karts, dirt bikes and other powersports product. Applicability includes the majority of models from companies like Zongshen, Lifan, Loncin, Jipin as well as the many primary, secondary and tertiary quality level manufacturers. The intake valve is 23mm and exhaust valve is 20mm (valves included). Unit also includes the cylinder head 20A8650, cam sprocket (for HS25 / 25H timing chain), camshaft 20A3000, rocker arms 20A2800, valve assembly 20A2001 and cylinder head cover set 20A2600. Complete gasket set (GSK8410) shown not included.