The MS 400 C-M is a professional workhorse built to cut hard, cut fast, and keep you moving. It runs a 66.8 cc engine that puts out about 5.4 brake horsepower for real-world cutting power without the extra bulk. STIHL packed the saw with M-Tronic electronic engine management that automatically adjusts fuel and ignition to changing conditions — no carburetor fiddling, consistent throttle response, and easier starts in the field. That exacting control helps the engine run cleaner and more efficiently under load.
What really sets the MS 400 C-M apart is the magnesium piston design. It keeps the motor light but increases displacement, giving a high power-to-weight ratio so the saw feels lighter on your arm while still delivering pro-level torque. The package weighs in around 12.8 pounds (powerhead) so you can handle long shifts, climbing work, or bucket-truck jobs without burning out. The 20-inch (S) guide bar paired with the STIHL RAPID™ Super 3/8" .050" 72-drive-link chain is matched for aggressive, fast cutting on hardwood and heavy timber. Chain oiling and an easy-access HD2 air filter cut down maintenance time; a pre-separator removes big debris before it hits the filter so you get longer run time between cleanings. On the jobsite that means: starts that behave, steady power under load, less arm fatigue, and a saw that takes a beating and keeps cutting. If you want a single saw that handles heavy limbing, felling medium trees, and heavy firewood all day long, the MS 400 C-M is built for it.
