They are great old saws,that got their start as the a77 way back and evolved into a cdi
ignition and bigger carb for the 4.6 hp model It was the line of saws that the 2100 was introduced in
and were built with big bearings ,2 rings and plenty of torque
i've owned three 480's in the past, nice torquey saw, but they do seam to cut a little slow for an 80cc saw, i'd buy another if the right deal came along...............