i just spent the last 2 and a half hours searching and reading through threads but i cant find an answer to this question - How does stihl come up with model numbers for their saws? the closest i can figure out is the cc's on some of the saws and hp on others. but i looked at specs on some saws and the cc's or horsepower and the model number were not that close. examples:ms310 at 59cc with 4 hp and an 026 at 49cc with 3.2 hp. they werent anywhere near each other. i did see a few models where the cc's or horsepower figures were only off from the model number by a few. examples: 064 at 84.9cc with 6.5 hp and an ms660 at 91.6cc with 7 hp. like i said i searched for a while so i apologize if this has been covered but i'm not very familiar with stihl saws - ive been a jonsered user for a while. thanks for any info.