Target Audience:
        
        
            Aprilia V990 engine owners, independent repair shops, performance tuners.
        
     
    
    
        
            Value Proposition:
        
        
            Provides essential technical data for maintaining and repairing a complex V-Twin motorcycle engine, crucial for longevity and performance.
        
     
    
    
        
            Table Of Contents:
        
        
            Includes a detailed table of contents for easy navigation.
        
     
    
        
            Comprehensiveness:
        
        
            Aims to be the definitive guide for engine service and repair.
        
     
 
    
    
    
        
            Primary Coverage:
        
        
            Engine Service and Repair
        
     
    
        
            Secondary Coverage:
        
        
            Maintenance, Rebuilding, Refurbishment, Restoration
        
     
    
    
        
            Estimated Page Count:
        
        
            Hundreds
        
     
    
    
        
            Manual Type:
        
        
            Service Repair Manual
        
     
    
    
        
            Language:
        
        
            English (assumed, standard for this type of manual)
        
     
    
    
 
    
    
    
        
            Engine Mechanical:
        
        
            Cylinder head, valve train, pistons, connecting rods, crankshaft, lubrication system, cooling system, timing components.
        
     
    
        
            Engine Electrical:
        
        
            Ignition system, fuel injection system, sensors, ECU (Electronic Control Unit) diagnostics.
        
     
    
        
            Fuel System:
        
        
            Fuel pump, injectors, fuel lines, pressure regulator, throttle body.
        
     
    
        
            Cooling System:
        
        
            Radiator, water pump, thermostat, coolant passages, fan operation.
        
     
    
        
            Lubrication System:
        
        
            Oil pump, oil filter, oil passages, oil cooler (if applicable).
        
     
    
    
        
            Disassembly Assembly:
        
        
            Complete engine disassembly and reassembly procedures, including torque specifications and sequences.
        
     
    
        
            Maintenance:
        
        
            Scheduled maintenance tasks, fluid changes, filter replacements, spark plug replacement.
        
     
    
        
            Troubleshooting:
        
        
            Diagnostic procedures for common engine problems, fault codes, and symptom-based troubleshooting guides.
        
     
    
        
            Rebuild Refurbishment:
        
        
            Detailed instructions for engine rebuilding, including component inspection, measurement, and replacement.
        
     
    
    
        
            Depth:
        
        
            Comprehensive, covering from basic checks to full engine overhauls.
        
     
 
    
    
    
        
            Engine Configuration:
        
        
            Liquid-cooled, four-stroke, 90-degree V-Twin
        
     
    
        
            Bore X Stroke:
        
        
            Typically 97 mm x 68 mm (V990 variants)
        
     
    
    
        
            Valve Train:
        
        
            DOHC (Dual Overhead Camshafts), 4 valves per cylinder
        
     
    
        
            Compression Ratio:
        
        
            Typically 10.8:1 or 11.3:1 (depending on model/variant)
        
     
    
    
        
            Horsepower:
        
        
            Approximately 130-140 hp @ 9,000-9,500 rpm (model dependent)
        
     
    
        
            Torque:
        
        
            Approximately 100-105 Nm @ 7,000-7,500 rpm (model dependent)
        
     
    
    
        
            Fuel Delivery:
        
        
            Electronic Fuel Injection (EFI), often with dual injectors per cylinder.
        
     
    
        
            Fuel Type:
        
        
            Unleaded gasoline, minimum 95 RON (Research Octane Number)
        
     
 
    
    
    
        
            Infotainment System:
        
        
            N/A (Motorcycle engine, focus is on performance and control systems)
        
     
    
    
        
            Engine Management:
        
        
            Advanced ECU controlling fuel injection, ignition timing, and sometimes idle speed control.
        
     
    
    
        
            Diagnostic Port:
        
        
            Diagnostic port for reading fault codes and performing system checks.
        
     
 
    
    
    
        
            Oil Change Interval:
        
        
            Typically every 3,000-6,000 miles or annually (refer to specific model service manual for exact interval).
        
     
    
        
            Spark Plug Replacement:
        
        
            Typically every 7,500-15,000 miles (depending on spark plug type).
        
     
    
        
            Valve Clearance Check:
        
        
            Significant interval, often around 12,000-18,000 miles, due to shim-under-bucket design.
        
     
    
    
        
            Engine Oil Type:
        
        
            Fully synthetic motorcycle engine oil, SAE 10W-40 or 15W-50 API SG, JASO MA/MA2 certified (confirm with specific model manual).
        
     
    
        
            Coolant Type:
        
        
            Ethylene glycol-based coolant with corrosion inhibitors, 50/50 mix with distilled water.
        
     
    
        
            Brake Fluid Type:
        
        
            DOT 4 or DOT 5.1, high-temperature brake fluid.
        
     
    
    
        
            Stator Failure:
        
        
            Some models may experience stator failures, leading to charging system issues.
        
     
    
        
            Cam Chain Tensioner Wear:
        
        
            Wear on automatic cam chain tensioners can lead to rattling noises and potential timing issues.
        
     
    
        
            Fueling Issues:
        
        
            Erratic fueling or lean conditions can sometimes arise from sensor issues or intake leaks.
        
     
    
        
            Oil Leaks:
        
        
            Common leak points can include valve cover gaskets or crankshaft seals.
        
     
 
    
    
    
        
            Manufacturer:
        
        
            Aprilia is an Italian manufacturer known for its high-performance motorcycles, particularly in racing and sportbike segments.
        
     
    
    
        
            V990 Development:
        
        
            The V990 engine platform was developed by Aprilia for their flagship sportbikes and naked bikes, evolving from earlier V-twin designs.
        
     
    
    
        
            Production Period:
        
        
            Introduced in the late 1990s, with the V990 powering models through the 2000s and beyond in various iterations.
        
     
 
    
    
    
        
            Racing Success:
        
        
            The V990 engine platform powered Aprilia motorcycles to numerous victories and championships in various motorcycle racing series (e.g., WSBK, AMA Superbike).
        
     
    
    
        
            Performance Reputation:
        
        
            Widely regarded for its strong performance, character, and sound among motorcycle enthusiasts.
        
     
    
    
        
            Emissions Compliance:
        
        
            Euro 1, Euro 2, or later emissions standards depending on the specific model year and market.