The STIHL FS91R-Z Petrol Whipper Snipper is powered by STIHL 4-MIX engine, which runs on a fuel-oil mix just like a 2-stroke, offers the benefits without the compromises of 4-stroke power. STIHL 4-MIX engine technology provides fast acceleration, more power, added torque, lower noise, reduced emissions and increased fuel efficiency to complete jobs quickly, quietly and more easily.The STIHL anti-vibration system is available in a one-point version for smaller models and in an especially effective four-point version for larger machines starting with the STIHL. It reduces handle vibration for easy and comfortable operation. Moreover, the decompression system automatically opens the intake valve during engine start-up. This prevents pressure peaks and considerably reduces the effort needed to pull the starting rope.This unit is ideal for working in areas where space is limited such as thinning between bushes and shrubs.