FS 131 TrimmerThis heavy duty professional bike handle trimmer has a low exhaust emission engine and good power to weight ratio. Landscaping professionals looking for a simplified and convenient trimming solution will love the STIHL FS 131 trimmer. With its low exhaust emission, 36. 3 cc engine and a larger fuel tank than the previous model, the FS 131 delivers 30% longer run times. Its bike handle design includes rubberized grips for enhanced grasp and comfort.