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The ECHO CS-450 chainsaw is powerful enough to take down trees 36 inch in diameter and light enough to be used to make quick work out of smaller jobs. The engine ignition timing is computer controlled to improve performance at idle and through tough cutting applications. Its powerful 45 cc engine provides ample power to the 18 inch bar and chain. Other features include: side access chain tensioner, automatic/adjustable (clutch-driven) oiler, inertia-type safety chain brake, and automotive style air filter and engine air pre-cleaner to ensure long engine life and extended maintenance intervals.