45.6 cc. Low-emission engine technology. Pre-separation air filtration system. Easy start pull system.

Additional Information
The Stihl chainsaw features all the comfort and ease of the MS 251, but is easy to start and adjust on the fly. The chainsaw is perfect for felling small trees, pruning and thinning, and cutting firewood simply and efficiently. And with up to 20 percent fuel savings and 50 percent reduced emissions (as compared to previous models), you can enjoy a longer run time while feeling good about your impact on the environment. A Quick Chain Adjuster also makes it simple to put the correct tension on the saw chain without tools. Plus, features like Easy2Startâ„¢ technology, a Master Control Lever and reduced vibration make the Stihl chainsaw a lean, easy-to-use machine that still packs plenty of power. 18".