STIHL MS 500i Professional ChainsawMS 500i First STIHL chainsaw with electronically controlled fuel injection provides consistent power under changing conditions. Designed and built exclusively for forestry personnel and tree service professionals, the MS 500i is the first ever chainsaw on the worldwide market with electronically controlled fuel injection. With its excellent power to weight ratio, this saw is an impressive piece of equipment for pros looking to take on tree felling,