🏷️ Basic Information Identification Make: Stihl Model: MS 391 Product Type: Brushcutter 📋 Manual Details General Manual Type: Workshop Service Repair Manual Language: English Format File Format: PDF Compatibility Operating Systems: All Versions of Windows & Mac Requirements Software Requirement: Adobe PDF Reader Delivery Download Type: Instant Download ⚙️ Engine Specifications Engine Type Engine Configuration: 2-stroke engine Displacement Engine Displacement Ms311: 59.0 cm³ Engine Displacement Ms391: 64.1 cm³ Power Engine Power Ms311: 3.2 kW (4.3 hp) Engine Power Ms391: 3.4 kW (4.6 hp) Fuel System Fuel Type: Gasoline Ignition System Ignition Type: Electronic 🔧 Maintenance Servicing Tools Special Tools Included: Yes 📄 Powertrain Drive System Drive Type: Direct drive Clutch Clutch Type: Centrifugal clutch Chain Drive Gear Ratio: Not specified (assumed direct drive) 📄 Components Chain Brake Chain Brake Mechanism: Inertia-activated Chain Tensioner Tensioning Method: Side-mounted tensioner Lubrication Chain Lubrication System: Automatic chain lubrication Starter Starting System: Rewind starter 📄 Manual Content Covered Systems Systems Covered: Clutch, Chain Drive, Chain Brake, Chain Tensioner, Engine, Ignition System, Rewind Starter, AV Handle System, Master Control / Handle System, Chain Lubrication, Fuel System Instructions Instruction Level: High quality diagrams and instructions Target Audience Intended User: Do-It-Yourselfer