I will look the saw over to make sure there are no other issue from the broken sprocket. For best performance, replace every three rims. The 8 pin will produce more chain speed and maybe less power/torque. We carry all top brands. Over 200+ free JavaScripts here! whatever. Replace for 0000 642 1206, For Oregon 22270, 0000 642 1207. otherwise give him the benifit of the doubt and know he made a mistake. ,