This professional STIHL® MS Series Chainsaw is as tough as it is technologically smart. Delivers exceptional power-to-weight ratio and fuel efficiency plus a unique engine management system that optimizes engine performance and compensates for changes in operating conditions such as temperature, elevation, fuel quality, and dirty air filters.

• 4 HP gas-powered 50.2cc engine
• 20in. bar with 0.325in. RM 3 chain pitch
• Decompression valve vents compression in the cylinder and helps reduce the effort needed to pull the starter rope for easier starting
• Anti-vibration system minimizes vibration levels for comfortable handheld use and reduced operator fatigue
• M-Tronic™ Intelligent Engine Management System eliminates low and high speed carburetor adjustment screws, compensating for a dirty air filter, changes in elevation and fuel quality to deliver optimum engine power at all times

• Environmentally conscious Reduced-Emission Engine Technology produces zero to low exhaust emissions, performing cleaner than EPA and/or CARB exhaust emission standards
• Pre-separation air filtration system technology boosts the efficiency of the engine's filter system, doubling the time between air filter cleanings
• Lift and twist toolless fuel and oil cap with retainer eliminates the need for a tool when refueling
• Side-access chain tensioner is very easy to get to, making it much more convenient for the user to adjust the saw chain with a bar wrench