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.
