The innovative engine technology on the new Stihl MS 261 and MS 261 C-Q chain saws reduce emissions by up to 50% and provide up to a 20% increase in fuel efficiency as compared to previous models, resulting in longer periods of use between refueling. Made for a variety of professional users like landscapers, arborists, loggers, farmers, and municipalities, these chain saws come equipped with a decompression valve for easier starts and an advanced anti-vibration system that helps reduce user fatigue. The compact, space-saving design of the split-barrel carburetor and the stainless steel muffler reduce overall weight. Both the MS 261 and MS 261 C-Q have several operator-friendly components, including a side-access chain tensioner, toolless fuel and oil caps with retainers, and a translucent fuel tank. Captive bar nuts are retained in the sprocket cover to prevent their loss and are designed for self-guided mounting. Pre-separation air filtration provides greater air cleaning efficiency and longer run times between filter maintenance. The MS 261 C-Q also includes Stihl Quickstop Plus, an additional chain braking system designed to stop the chain in less than 1 second of releasing the rear handle.