Echo CS-4920-16 50.2cc Chainsaw with 16" Bar - The CS-4920 features a powerful 50.2cc, 2-stroke engine but is the lightest saw in its class. With a purge bulb for easier starts and a momentary switch that returns to the "ON" position when the saw is shut off, the CS-4920 is simple to operate. Its heavy-duty air filter with tool-less access provides superior air filtration. An automatic, adjustable clutch-driven oiler operates only when the chain is moving to reduce oil consumption.