ATV Cylinder Head 125cc 52mm Bore, fits most Coleman ATVs. Some models had 125cc with 54mm bore. Please confirm fitment before ordering. NOTE: The cam sprocket on this head has 28 teeth. Please be sure to check your current cam sprocket to confirm it also has 28 teeth. Coleman may also have used a cam sprocket with 32 teeth on some of their units. If so, this head will not work for you.