Chainsaw

Stihl MS 391

2-Stroke

The Stihl MS 391 is a 64.1cc 2-stroke Farm Boss chainsaw bridging Stihl's agricultural line and full professional class. It accepts 18" to 20" guide bars and targets ranchers and loggers who regularly fell large trees and process hardwood. The MS 391 runs a Walbro carburetor <!-- verify: stihlusa.com --> with professional anti-vibration. At this displacement, bar and chain condition directly affect engine longevity — a dull chain strains the fuel and ignition systems under load. Fuel system service (filter, primer bulb, lines) and annual carburetor inspection are the primary maintenance requirements.