🏷️ Basic Information Identification Make: Aprilia Model: RS 655 / Tuono 655 (Rotax 655 EFI Engine) Engine Code: Rotax 655 EFI Generation Covered Years: 1997-2001 Codes Engine Variant: EFI (Electronic Fuel Injection) 👋 Introduction Market Position Target Audience: Aprilia motorcycle owners, independent repair shops, technicians specializing in Aprilia or Rotax engines Competitive Analysis Value Proposition: Provides essential, detailed technical information for maintaining and repairing the specific Rotax 655 EFI engine, crucial for owners of models equipped with this powerplant. Key Features Manual Highlights: Focuses exclusively on engine overhaul and repair, includes essential technical data, structured disassembly and reassembly steps, comprehensive indexing for quick reference. 📋 Manual Details Coverage Areas Primary Coverage: Aprilia Rotax 655 EFI engine Page Count Total Pages: 192 Manual Type Type: Engine Repair Manual / Engine Service Manual Language Languages Provided: English, Italian, German Format Digital Format: PDF Compatibility: Windows/macOS Delivery Delivery Method: Instant Download 📖 Manual Coverage Systems Covered Engine Systems: Engine mechanicals, lubrication, cooling, fuel delivery (EFI), ignition, exhaust, starting system, internal components Procedures Included Repair Procedures: Engine removal, disassembly, reassembly, installation, component inspection and testing, troubleshooting Technical Depth Depth Of Information: Comprehensive rebuild and repair procedures, detailed diagnostic guidance, technical specifications 📊 Manual Specifications File Format File Type: PDF Print Quality Printability: Printable pages Binding Type Binding: N/A (Digital) Paper Type Paper Quality: N/A (Digital) ⚙️ Engine Specifications Primary Engine Engine Type: Rotax 655 EFI Engine Configuration: V-Twin (likely, based on typical Aprilia configurations of this era) Displacement: Approximately 650cc (exact specification will be detailed within the manual) Performance Horsepower: Estimated 60-75 HP (specific figures available in manual) Torque: Estimated 60-70 Nm (specific figures available in manual) Fuel System Fuel Injection: Electronic Fuel Injection (EFI) Throttle Body Size: To be detailed in manual (likely 38-40mm range) Ignition System Ignition Type: Electronic Ignition (likely Digital) Cooling System Cooling Method: Liquid-cooled Lubrication System Oil Type Recommendation: Specific grades detailed in manual (e.g., SAE 10W-40 or 15W-50, JASO MA compliant) Oil Capacity: To be detailed in manual (typically 2.5-3.5 liters including filter) Internal Components Valve Train: DOHC (Dual Overhead Camshafts) with 4 valves per cylinder (expected) Pistons: Specifications for bore, stroke, compression ratio detailed in manual Crankshaft: Specifications for journals, balancing detailed in manual 🔧 Transmission Standard Transmission Type: Manual (6-speed is typical for this class of Aprilia) Optional Transmission Variants: N/A (this is an engine manual, transmission details might be limited to removal/installation context) Features Clutch Type: Wet multi-plate clutch (typical for Aprilia) 📐 Dimensions Exterior Engine Dimensions: Specific external dimensions of the engine block itself are not typically provided in an engine manual, but the manual will cover its fitment within the chassis. Weights Engine Dry Weight: Approximate weight of engine assembly to be found in manual (likely 50-65 kg range) 🛡️ Safety Features Ratings Vehicle Safety Ratings: N/A (This is an engine manual, not a vehicle safety guide. Vehicle-specific ratings would be in a separate owner's manual.) Active Features Engine Safety Features: EFI system diagnostics, potential for ECU-based safety parameters (details within manual) Passive Features Engine Structural Safety: Material specifications and tolerances for engine components ensure structural integrity under operating conditions. 💡 Technology Features Infotainment Infotainment Systems: N/A (This manual pertains solely to the engine mechanics and operation, not vehicle infotainment systems.) Driver Assistance Driver Assistance Features: N/A (Focus is on engine technology, not vehicle driver aids.) Connectivity Engine Connectivity: Electronic Fuel Injection (EFI) represents the primary technological advancement covered, managing fuel and ignition timing for optimal performance and emissions. 🔧 Maintenance Service Intervals Oil Change Interval: Details on recommended oil change intervals based on mileage or time will be in the manual. Spark Plug Replacement: Specifications for spark plug type, gap, and replacement intervals will be provided. Valve Clearance Check: Crucial maintenance procedure, with specified intervals and adjustment procedures detailed in the manual. Fluid Specifications Coolant Type: Recommended coolant type and mixture ratio (e.g., ethylene glycol-based antifreeze) will be specified. Brake Fluid Type: While primarily an engine manual, it may reference brake system interaction or maintenance points where fluid types are relevant. Gearbox Oil Type: If integrated with engine lubrication or if a separate gearbox oil is specified, it will be detailed. Known Issues Common Engine Problems: The manual's troubleshooting section will address common issues like starting problems, performance degradation, leaks, and component wear specific to the Rotax 655 EFI. Diagnostic Troubleshooting Efi System Diagnosis: Detailed guidance on diagnosing issues related to the fuel injection system, sensors, and ECU will be a key feature. 📚 Vehicle History Brand Heritage Aprilia Heritage: Aprilia has a strong heritage in sportbike and performance motorcycle manufacturing, known for innovative engineering and racing success. Model Evolution Rotax 655 Engine Application: The Rotax 655 engine was a key powerplant for Aprilia's mid-size performance motorcycles in the late 1990s and early 2000s, including models like the RS 655 and Tuono...