FS 131 R TrimmerMORE TORQUE, WIDER CUTTING. SAME RELIABILITY. Engineered for power and precision, the STIHL FS 131 R trimmer features a new high torque gearbox that delivers 13. 5% more torquemaking quick work of dense vegetation and tough trimming jobs. The cutting radius has been increased to 17. 7", allowing for more efficient coverage and fewer passes. A new deflector with a skirt ensures cleaner operation and better debris management. The gearhead has been