MS 251 CB-E | Powerful Lightweight Adjustable - STIHL MS 251 C-BE. Central Texas The STIHL MS 251 C-BE Chainsaw features all the comfort and ease of the MS 251, but is easy to start and adjust on the fly. The MS 251 C-BE 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..4.4/5(344)Brand: STIHL stihl ms 251c | eBay www›Search›stihl ms 251cStihl OEM MS251C Sprocket Clutch Cover MS 251 C MS231 231 1143-648-0401 #GS-SE3H See more like this Stihl MS251C MS251 Chain Tenshoner Adjuster Rail Cover. OEM.