Echo CS-501P 20" Chainsaw Made with pros in mind, the CS-501P is the lightest 50 cc chainsaw in North America, built for heavy use, logging and larger clearing without added effort. Features: 50.2 cc professional-grade, 2-stroke engine For outstanding performance and durability. Captive bar nuts Prevent loss of hardware Ergonomic aluminum front handle Improves comfort and maneuverability Professional-grade bar and chain Performance Cutting System(TM) maximizes cutting ability and durability Automatic, adjustable clutch-driven oiler Operates only when the chain is moving to reduce oil consumption Decompression valve Reduces rope-pulling effort for easier starts G-Force Engine Air Pre-Cleaner™ Extends air filter life and reduces maintenance intervals Top-mounted, tool-less access, two piece air filter Provides for easy access and easy cleaning