i was just using dad's 250. has 16"bar and new safety chain. why does his saw feel so much weaker than my 028 with 18"bar and safety chain. if i had to put a number to it, i'd say my 028 is 15 to 25% stronger. both saws seem to run well. also, does anyone know (off the top of their head) whether my old 18" bar will fit dad's saw?