| Displacement | 4.1 in³ |
| Engine power | 5.40 bhp |
| Device weight without refuelling | 12.7 lb 1) |
| System weight without refuelling | 15.7 / 17.2 / 15.9 / 15.4 / 16.2 / 16.1 / 17.1 lb 2) |
| Power-to-weight ratio | 2.4 lb/hp |
The pictures shown are sample photos. The actual appearance of the equipment features and their specific attachment to the product may differ from the pictorial representations, but will have the same functionality.
Built for demanding tree care and forestry work, the STIHL MS 400 C-M delivers serious professional cutting performance without added weight. Its advanced magnesium piston provides greater displacement, power, and torque than aluminum piston-equipped counterparts, giving professionals the strength to take on tough cutting jobs in a well-balanced package. STIHL M-Tronic™ engine technology automatically adjusts to changing operating conditions, helping maintain fuel-efficient, low exhaust emission performance throughout the workday.
When the work doesn’t let up, the MS 400 C-M is designed to keep downtime to a minimum. A pre-separation system removes larger debris before it reaches the air filter, extending the time between cleanings, while the long-life HD2 air filter can be cleaned instead of replaced. With intelligent engine management, purposeful weight savings, and an air filtration system built for longer run times, the MS 400 C-M gives tree care and forestry professionals the performance they need to keep demanding work moving.

Improper use of any power tool may cause serious or fatal injury. Read, understand, and follow carefully the operating and safety instructions in your instruction manual before using such products. STIHL products sold through U.S. STIHL Dealers are for distribution in the United States only. Improper use of any power tool may cause serious or fatal injury. Read, understand, and follow carefully the operating and safety instructions in your instruction manual before using such products. STIHL products sold through U.S. STIHL Dealers are for distribution in the United States only.
Proposition 65 - EnglishThis product contains chemicals known to the State of California to cause cancer and reproductive harm. www.P65Warnings.ca.gov
E-10 StatementNote: STIHL recommends use of fuel with no more than 10% Ethanol content. Using fuel with greater than 10% Ethanol content may cause damage to your equipment and may void your STIHL warranty.