Ryobi rcs4240b petrol chainsaw has a powerful 2 stroke 42cc powr xt full crank engine that delivers outstanding durability and performance the three point anti vibration isolation provides additional user comfort and reduced fatigue during prolonged use the chainsaw also has a fast acting inertia activated chain brake for increased safety other features include a tool less chain tensioning system automatic chain and bar lubrication and a clear fuel and oil tank for easy view of fluid levels spe