🏷️ Basic Information Identification Make: Mercury Mariner Model: 20jet / 20 / 25 / 25 Marathon / 25 Sea Pro Year: Unknown Generation: Unknown 📋 Manual Details Manual Information Manual Type: Factory Service Repair Manual Delivery Method: Digital Download Format: PDF Language: English Page Count: Unknown ⚙️ Engine Specifications Engine Type Engine Type: 2-stroke Displacement Displacement: Unknown Power Horsepower: 20-25 HP Carburetion Fuel System: Carbureted Ignition Ignition System: Unknown Cooling Cooling System: Water-cooled Exhaust Exhaust System: Through propeller 🔧 Transmission Drive System Drive Type: Outboard Gear Ratio Gear Ratio: Unknown Shift Positions Shift Positions: Forward, Neutral, Reverse 🔧 Maintenance Lubrication Oil Type: 2-stroke outboard oil Oil Mixture Ratio: Refer to manual Fuel Recommended Fuel: Unleaded gasoline Spark Plugs Recommended Spark Plug: Refer to manual 📄 Troubleshooting Electrical Electrical System Coverage: Included Fuel System Fuel System Coverage: Included Powerhead Powerhead Coverage: Included Mid Section Mid Section Coverage: Included Lower Unit Lower Unit Coverage: Included Controls Control Linkage Coverage: Included Starter Manual Starter Coverage: Included 📄 Serial Numbers Identification Us Serial Number Range Start: 0G044027 Belgium Serial Number Range Start: 09807909