Echo CS-501P Rear Handle Chainsaw20% more power than the CS 490 with more professional features. 18" and 20" bar lengths. This lightweight 50. 2 cc chain saw provides category leading features and benefits, all at an affordable price. The professional grade bar and chain adds to its superior operation and performance. Features: 50. 2 cc professional grade, 2 stroke engine Captive bar nuts no chance of losing fasteners Ergonomic aluminum front handle for improved comfort and