4 Model CS-352 The ECHO CS-352 Chain Saw features a 34.0cc Power Boost Vortex™ engine that delivers superior power and improved cutting performance and weighs less than 9 pounds. It also features an i-30™ starting system that reduces starting effort by 30%, a top-mounted air filter that is positioned away fem dirt and debris, a dual post chain brake system for increased durability, a side access chain pensioner for easy chain adjustment, and an automatic clutch-driven oilier that reduces oil consumption.