This manual covers the Yamaha Exciter Twin jet boat, model variant Exciter 270, produced in 1998. Model codes EXT1200 and EXT1200W are included. Yamaha's heritage in marine craft is marked by a commitment to reliable performance, and the Exciter line represented a significant development in personal watercraft, focusing on enhanced handling and power. This specific model features a twin-cylinder, 2-stroke engine with a displacement of 1198cc, likely equipped with dual or triple carburetors and an oil injection system. The propulsion is handled by a direct-drive jet pump unit, with potential for a twin-engine and pump configuration indicated by the model codes. This comprehensive Factory Service Manual is designed as an essential diagnostic and repair resource for owners and technicians. It provides detailed guidance on repair and maintenance procedures, covering critical systems such as the engine mechanicals, cooling and fuel systems, the jet pump unit, the electrical system including wiring diagrams, and the hull and deck. Within its pages, you will find step-by-step repair instructions, scheduled maintenance guidelines, adjustments, troubleshooting procedures, and clear component illustrations. The manual serves as the authoritative technical guide, enabling users to effectively maintain and repair their Yamaha Exciter Twin jet boat. 🏷️ Basic Information Identification Make: Yamaha Model: Exciter Twin Model Variant: Exciter 270 Year: 1998 Vehicle Type: Jet Boat Engine Configuration: Twin Engine (implied by EXT1200W model code) Codes Model Codes Covered: EXT1200, EXT1200W 👋 Introduction Market Position Positioning: Essential diagnostic and repair resource for Yamaha Exciter Twin owners and technicians. Competitive Analysis Analogy: Serves as the authoritative technical guide, akin to official manufacturer workshop manuals. Key Features Access: Instant download upon purchase. Durability: Permanent digital storage on user devices. 📋 Manual Details Coverage Areas Primary Coverage: Repair and Maintenance Specific Chapters: General Information, Maintenance and Adjustments, Fuel System, Cooling System, Engine, Jet Pump Unit, Electrical System, Hull and Deck, Wiring Diagrams, Troubleshooting. Manual Type Type: Factory Service Manual / Repair Manual Format Format: Digital Download (PDF) Language Language: English Page Count Page Count: Not Specified (Comprehensive) 📖 Manual Coverage Systems Covered Engine Systems: Engine mechanical, cooling system, fuel system Powertrain Systems: Jet Pump Unit Electrical Systems: Electrical System, Wiring Diagrams Body Systems: Hull and Deck Procedures Included Maintenance Procedures: Scheduled maintenance, adjustments Repair Procedures: Component removal and installation, detailed step-by-step repairs Troubleshooting: Diagnostic procedures for various systems Component Illustrations: Assembly/system illustrations, diagrams, exploded parts views, pictures. Technical Depth Depth: Comprehensive, covering all aspects of repair and maintenance Diagnostic Charts: Includes troubleshooting sections with diagnostic procedures. 📊 Manual Specifications File Format File Type: PDF Searchability: Likely text-searchable PDF, enhancing ease of use. Print Quality Quality: Identical to printed version, high resolution Binding Type Binding: N/A (Digital) Paper Type Paper: N/A (Digital) Software Requirements Software: No special software required (standard PDF reader) ⚙️ Engine Specifications Primary Engine Engine Type: Twin-cylinder, 2-stroke Displacement: 1198cc (Refer to specific model variants for precise details) Performance Horsepower: Refer to manual for specific output, typically in the 130-150 HP range for this class of engine. Torque: Refer to manual for specific figures, typically strong low-end torque for acceleration. Fuel System Fuel Delivery: Carburetor (likely dual or triple carburetors, specific details in manual) Lubrication Oil System: Oil injection system (common for 2-stroke marine engines of this era) Cooling System Cooling Type: Closed-loop cooling system with heat exchanger, or raw water cooling (details in manual) 🔧 Transmission Standard Type: Direct drive jet propulsion unit Features Drive System: Single or twin jet pump system depending on configuration (EXT1200W implies twin engine/pump setup) 📐 Dimensions Exterior Length: Refer to model-specific specifications (typically 10-13 feet for this class) Weights Dry Weight: Refer to model-specific specifications (typically 700-900 lbs) 🛡️ Safety Features Passive Features Buoyancy: Integral hull flotation Active Features Ignition Safety: Lanyard kill switch system 💡 Technology Features Infotainment Instrumentation: Analog gauges for speed, RPM, fuel level, engine temperature, oil level (typical for the era). Driver Assistance Performance Features: Trim control systems for optimizing ride characteristics (if equipped). Connectivity Diagnostics: Onboard diagnostics may be limited; manual is primary diagnostic tool. 🔧 Maintenance Service Intervals Routine Checks: Daily/Pre-ride checks, post-ride flushing (detailed in manual) Annual Maintenance: Refer to manual for specific intervals (e.g., spark plug replacement, impeller inspection, fuel filter change). Fluid Specifications Engine Oil: 2-stroke marine oil, TC-W3 or equivalent (specific grade and type in manual) Coolant: Engine coolant (specific type and mixture ratio in manual) Jet Pump Grease: Marine-grade grease (specific type and lubrication points in manual) Gearbox Oil: If applicable for jet pump bearings/gearbox, refer to manual for type and viscosity. Known Issues Common Wear Items: Impeller wear, carbon fiber reed valves (if applicable), fuel system components (carburetor jets, fuel lines). Seasonal Storage: Proper winterization procedures are critical for preventing damage (detailed in manual). 📚 Vehicle History Brand Heritage Heritage: Yamaha has a long-standing reputation for reliable and high-performance marine engines and watercraft. Model...