🏷️ Basic Information Identification Make: Mercury Model: Mariner Outboard Optimax DFI Year: 1997-1998 Generation: Optimax DFI (200/225 HP) 📋 Manual Details Documentation Manual Type: Service Manual / Repair Manual Language: English Delivery Format: PDF Delivery Method: Instant Download ⚙️ Engine Specifications General Engine Type: Outboard Motor Engine Configuration: 4-Stroke Power Output Horsepower: 200 HP / 225 HP Fuel System Fuel Injection Type: Multi-point Sequential Electronic Fuel Injection (DFI) Valvetrain Camshaft Type: DOHC (Double Overhead Camshaft) Cooling System Cooling Method: Water Cooled Lubrication System Oil System: Wet Sump Starting System Type: Electric Start Fuel Recommendations Octane Rating: 87, 91, 92, 93 Octane, Race Gas Performance Recommended Operating Range: Specific RPM range provided in manual 🔧 Transmission Gearing Gear Selection: Forward-Neutral-Reverse Propeller Rotation Standard Rotation: Right-hand rotation Counter Rotation: Available (specific models) 🔧 Maintenance Intervals Maintenance Schedule: Comprehensive chart provided in manual Fluid Capacities Gearcase Oil Capacity: Specified in ml (details vary by model) Engine Oil Amount: Specified in liters/quarts (details vary by model) Filters Oil Filter Change: Procedure detailed in manual Fuel Filter Change: Low Pressure and High Pressure filter procedures detailed Ignition Spark Plug Replacement: Procedure and specifications detailed Cooling System Water Pump Impeller Replacement: Procedure detailed Engine Components Tappet Clearance Adjustment: Procedure detailed 📄 Electrical Charging System System Type: Battery Charging System (Coil, Rectifier/Regulator) Ignition System Ignition Timing: Specifications and adjustment procedures provided Spark Plug Type: Specific type and resistance values detailed Crank Position Sensor Resistance: Resistance values specified Ignition Coil Resistance: Resistance values specified 📄 Diagnostics Troubleshooting Coverage: Extensive troubleshooting guides for common issues (e.g., engine not starting, rough idle, overheating) Wiring Diagrams Availability: Included 📄 Powerhead Rebuild Coverage: Complete rebuild procedures for engine block, cylinder head, crankshaft, pistons, etc. 📄 Mid Section Components Coverage: Inspection, removal, installation of driveshaft housing, oil pan, swivel bracket, steering bracket 📄 Lower Unit Rebuild Coverage: Gear case, gears, shimming, adjustment, drive shaft, oil seals, water pump, shift guide housing, propeller shaft 📄 Attachments Control Linkage Coverage: Throttle/Shift Linkage, Tiller Handle procedures