That only applies to Robogenesis models (his name is always in the name of the file if this applies, and if not the default scale will be 86.00000). Otherwise, you'll have to scale it based on one of the three dimensions (the easiest being height), which isn't too difficult since most recent files are scaled to a regular person and not a 7'2 monster.
How to Scale Your Armor - Tutorial
Check that topic for more information about scaling.