11/12*6*6

not only Coleman 125cc use it, but also some of Tao Tao, and Coolster, other brands use it at their 125cc units too

This is special Coleman 125cc Cylinder repair kit

1,cylinder head 52mm bore, 32 Teeth timing sprocket, Intake Valve dia: 23mm, Exhaust valve dia: 20mm

2, Cylinder Jug bore 52mm, (not 54mm)

make sure all parameters when you order it. thanks