Stihl FS 131 Professional Trimmer, 36.3cc EngineStihl FS 131 Professional Trimmer, 36. 3cc Engine The STIHL FS 131 trimmer features more power and comfort than previous models. With its 36. 3 cc engine and 710 cc fuel tank, this trimmer runs 30% longer than the FS 130. Its bike handle has been redesigned with rubberized grips for enhanced comfort. The trimmer also features one touch stop, an easy, three step starting procedure enabled by the semi automatic choke lever, improved air filtration, and