🏷️ Basic Information Identification Make: Mercury Model: Mariner Outboard Generation: 20jet/20/25 HP 2-stroke Covered Models: 20Jet, 20, 25, 25 Marathon, 25 Sea Pro Serial Number Us: 0G044027 and above Serial Number Belgium: 09807909 and above 📋 Manual Details Manual Information Manual Type: Service Repair Manual Language: English File Format: PDF Printable: Yes Compatibility: WINDOWS and MAC Requirements: Adobe PDF Reader Manual Origin: Not a scanned service repair manual ⚙️ Engine Specifications Engine Details Engine Type: 2-stroke Horsepower: 20 HP / 25 HP Displacement: Not specified in product description (typical for this era might be around 25 cu. in. or 400-450 cc) Cooling System: Water Cooled Ignition System: CDI (Capacitor Discharge Ignition) - assumed for this era Fuel Delivery: Carburetor Starting System: Manual Starter 🔧 Transmission Gear System Type: Outboard Gearcase Gear Ratios: Not specified in product description (typically 2.00:1 or similar for this HP range) 🔧 Maintenance Service Procedures Covered Procedures: Maintenance and repair procedures, complete disassembly, electrical, fuel system, powerhead, mid-section, lower unit, attachments/control linkage Target Audience: Do-it-yourselfer and experienced mechanic Content Detail: Step-by-step instructions, hundreds of photos and illustrations