Poulan Pro PR5020 has a 50 cc, 2-cycle engine features Super Clean air filter system, aluminum Professional style clutch cover for more durability, automatic chain oiler, tool-less access to air filter and spark plug, reduced vibration handle with effortless pull starting system - purge and spring assist, side mounted chain tensioner, and an on-board locking wrench holder in handle. OxyPower technology offers better fuel efficiency with more power but less emissions and lower fuel consumption. EPS reduces the resistance in the starter cord. 20 In. low kickback bar and chain. Medium duty applications. Fully assembled. Includes carry case. 2 year limited warranty.