The problem is that if the scores are several thousandths of an inch deep, by the time you hone them away the bore will be so far oversized that a standard piston will rattle in it and standard rings won't seal properly. Hence you use a hone for breaking the glaze in a used cast iron bore (Briggs recommends that you do not break the glaze in an aluminium bore, by the way) or just for polishing out scuff marks up to perhaps 0.0005" deep. If the bore is scratched significantly, you rebore the cylinder and fit an oversized piston and rings, or you browse around the local tip for a defunct engine with a decent bore.
Unless you have a good milling machine with a boring head attachment, or a fairly big lathe (and the latter is a rather crude approach), home reboring is not very practical.
