Owning a Mercury Mariner Outboard means investing in performance and reliability. Whether you're maintaining a 25hp 2-stroke engine or troubleshooting electrical systems, having the right technical guidance is critical. This Service Repair Workshop Manual delivers factory-accurate instructions to keep your Marathon/SeaPro series running at peak condition—from 1998 models to current production. Complete repair coverage: Lower unit disassembly, tilt/trim systems, CDI ignition, carburetor service, and propeller drive maintenance Precision specifications: Gear ratios (typically 2.00:1), fuel/oil mix ratios (50:1), and marine-grade lubrication requirements Visual troubleshooting aids: High-resolution diagrams and exploded views for every component Systematic diagnostics: Step-by-step flowcharts for electrical, fuel, and cooling system failures This instant-download PDF manual eliminates guesswork with: Water cooling system maintenance protocols Rewind starter rebuild sequences Timing adjustment procedures with torque values Cross-platform compatibility (Windows 95 through current OS, Mac OS) Engineered for marine technicians and DIY owners alike, this manual transforms complex repairs into methodical procedures—saving you diagnostic fees and extending your outboard's service life. 🏷️ Basic Information Identification Make: Mercury Mariner Model: Outboard Series: Marathon / SeaPro Year From: 1998 Year To: Current 📋 Manual Details Content Manual Type: Service Repair Workshop Manual Language: English Delivery Format: PDF Download Delivery Method: Instant Download Compatibility Operating Systems: All (PC & MAC Compatible - Windows 95 to 7 and newer, Mac OS) ⚙️ Engine Specifications Configuration Engine Type: 2 Stroke Cylinder Count: 2 (typical for 25hp models) Performance Horsepower: 25hp Fuel System: Carbureted Ignition Ignition System: CDI (Capacitor Discharge Ignition) Cooling Cooling System: Water Cooled 🔧 Transmission Drive Drive Type: Outboard Propeller Drive Gear Ratio Gear Ratio: Varies by model/propeller, typically around 2.00:1 or similar 🔧 Maintenance Routine Tune Up Procedures: Included Timing Adjustments: Included Lubrication Gear Case Oil Type: Specific marine gear lubricant Fuel Oil Mix Ratio: Typically 50:1 (or as specified by manual) 📄 Repair Topics Troubleshooting Troubleshooting Guide: Comprehensive A-Z Systems Electrical System Repair: Included Fuel System Repair: Included Components Lower Unit Repair: Included Tilt Trim System: Included Rewind Starter Repair: Included Assembly Base Repair: Included Visuals Diagrams And Pictures: High Quality Pictures & Diagrams