STIHL MS 400 C-M 66.8cc Professional Gas Chainsaw with M-Tronic - 16"

The STIHL MS 400 C-M is a 66.8cc professional-grade gas chainsaw built for tree care crews and forestry professionals who need a saw that stays consistent under changing loads, day after day.

Magnesium piston, more power without more weight

STIHL built the MS 400 C-M around a magnesium piston instead of the aluminum piston found in comparable saws, allowing for greater displacement, power, and torque without adding extra weight to the powerhead.

M-Tronic engine management

M-Tronic electronically manages ignition timing and fuel delivery in real time, keeping the engine running at low emissions and full efficiency across changing altitude, temperature, and fuel quality without any manual carburetor adjustment.

Ready for continuous professional use

An HD2 long-life air filter with a pre-separation system keeps debris out of the engine on dusty jobs, a manual decompression valve eases starting effort, and side-mounted chain tensioning speeds up mid-job adjustments.

Key features

• 66.8cc gas engine with a magnesium piston, 5.4 bhp
• M-Tronic electronic engine management, no manual carburetor tuning
• 16-inch bar with 3/8 inch pitch chain, 0.063 inch gauge
• HD2 long-life air filter with pre-separation
• Anti-vibration system and manual decompression valve
• Side-mounted, tool-free chain tensioning

Specifications

Frequently asked questions

What fuel mix does the MS 400 C-M need?

It runs on a gasoline and STIHL two-stroke oil mix; refer to the owner's manual for the correct ratio, and use fresh fuel to keep the M-Tronic system running at its best.

What does M-Tronic do?

M-Tronic is STIHL's electronic engine management system, adjusting ignition and fuel delivery automatically so the saw performs consistently regardless of altitude, temperature, or fuel quality, without manual carburetor adjustment.

Who is this saw built for?

The MS 400 C-M is aimed at professional tree care and forestry work where the saw runs for extended periods under varying load, rather than occasional homeowner use.

What is in the box

The MS 400 C-M ships with the chainsaw powerhead, a 16-inch guide bar, saw chain, bar cover, a combination scrench tool, and the owner's manual.