The STIHL MS 400 C-M is the world’s first chainsaw with a magnesium alloy piston, engineered specifically for the most demanding tree care and forestry professionals. This advanced construction provides greater displacement, power, and torque without adding weight, resulting in an exceptional power-to-weight ratio that drives jobsite productivity.
Equipped with a 66.8 cc engine delivering a massive 5.4 bhp, the MS 400 C-M features the STIHL M-Tronic engine management system. This "intelligent" saw digitally monitors and automatically adjusts for changes in elevation, temperature, and fuel quality. With its modern design and professional-grade durability, it is a cutting-edge workhorse designed to perform under the toughest conditions.
Key Features & Benefits
World-First Innovation & Performance
- Magnesium Alloy Piston: Lighter than traditional aluminum pistons, allowing for higher RPMs and faster acceleration with increased torque.
- STIHL M-Tronic: Microprocessor-controlled engine management eliminates manual carburetor adjustments and ensures optimum power at all times.
- Excellent Power-to-Weight Ratio: Delivers high-output performance (5.4 bhp) in a lightweight 12.8 lb powerhead for reduced operator fatigue.
Advanced Filtration & Maintenance
- Pre-Separation Air Filtration: Uses centrifugal force to eject heavy debris before it reaches the filter, doubling the time between cleanings.
- HD2 Air Filter: A long-life, washable filter designed to capture even the finest dust particles, significantly extending engine life.
- Adjustable Automatic Oiler: Fine-tune the lubrication of your bar and chain to match different wood types and bar lengths.
- Side-Access Chain Tensioner: Conveniently adjust chain tension with a bar wrench from the side of the housing.
Professional Comfort & Safety
- Decompression Valve: Vents cylinder compression during startup, making it much easier to pull the starter rope.
- STIHL ElastoStart: A specialized handle with a shock absorber that smooths out the peak forces felt during cranking.
- Anti-Vibration System: Dramatically reduces handle vibration to ensure a more comfortable working experience during long shifts.
- Toolless Fuel and Oil Caps: Simple lift-and-twist caps with retainers allow for fast, tool-free refueling on the go.
Technical Specifications
| Intended Use | Professional / Forestry |
| Displacement | 66.8 cc |
| Engine Power | 5.4 bhp |
| Powerhead Weight | 12.8 lbs. |
| Fuel Capacity | 20.3 oz. |
| Chain Oil Capacity | 11.0 oz. |
| Recommended Bar Length | 20 in. |
| Chain Type | 3/8" RS3 |
