When professionals need to fell large trees， in large quantities， they reach for the saw they know has the power to get the job done - the MS 661 C-M. Featuring an impressive power-to-weight ratio and STIHL M-Tronic engine management technology， the MS 661 C-M chainsaw also delivers less vibration and 20 percent greater fuel efficiency than the MS 660. Other features include a long-life filter system using HD-2 filter elements to provide longer run times between maintenance， an ElastoStart handle， and a high output adjustable oiler. (Wrap-handle version available in select areas.) See MS 661 R C-M.Find the GAS CHAINSAW 661 C-MZ at Ace.