51.7cc with 3.4HP Engine is ideal for farming to tree service. Air purge for cold starts. 5-Point anti-vibration system for increased comfort. Decompression valve provides easy starting. Tool-free twist knob on filter cover. Lateral chain tensioner located to avoid contact with chain. Bar length: 20". Automatic and adjustable oil pump. Oil tank: 9.13 fl.oz. Fuel tank: 16.9 fl.oz. Maximum RPM: 13400. 50-State compliant.