🏷️ Basic Information Identification Make: Aprilia Model: RS125 Year: 1999 Model Code: External references suggest variants like AP8114530, AP8114532, etc., but specific internal codes for 1999 model year are best confirmed within the manual. 👋 Introduction Market Position Positioning: The Aprilia RS125 of this era was positioned as a premium, high-performance lightweight sportbike, often considered one of the best 125cc motorcycles available. It aimed to provide a near-superbike riding experience in a smaller displacement package. Competitive Analysis Competitors: Competed against other premium 125cc sportbikes of the late 1990s, such as the Yamaha YZF-R125 (later models), Honda RS125 GP (racing, but influenced road models), Cagiva Mito 125, and Suzuki GSX-R125. Key Features Features: DOHC, two-stroke, liquid-cooled engine; aggressive styling inspired by larger Aprilia RSV Mille; advanced chassis and suspension for its class; strong performance figures for a 125cc. 📋 Manual Details Coverage Areas Coverage Scope: Complete factory service repair Page Count Estimated Page Count: Hundreds (exact count varies by edition, but typically 300-500+ pages for this era of factory manuals) Manual Type Type: Factory Service Repair Manual Language Language: Likely English, with potential for other European languages depending on original distribution. Primary language for this listing is English. Format Format: Downloadable PDF 📖 Manual Coverage Systems Covered Engine Mechanical: Complete overhaul, internal components (piston, rings, cylinder, crankshaft, connecting rod), valve timing, compression testing, lubrication system. Engine Electrical: Ignition system, CDI unit, spark plug, charging system (alternator, stator), starter motor, wiring diagrams, sensor testing. Fuel System: Carburetor (likely Dell'Orto PHBH or similar) tuning, cleaning, rebuilding, fuel pump, fuel lines, fuel filter. Cooling System: Radiator, water pump, coolant hoses, thermostat, coolant specifications and flushing procedures. Exhaust System: Expansion chamber, muffler, catalytic converter (if applicable), gasket replacement, inspection. Transmission: Clutch operation, gear selection mechanism, gearbox disassembly and assembly, gear ratios, lubrication, clutch fluid. Brakes: Front and rear brake systems (likely hydraulic discs), caliper overhaul, brake fluid type and bleeding procedures, master cylinder, brake pad replacement, rotor inspection. Suspension: Front fork (telescopic, likely inverted) disassembly, seal replacement, oil type and level, rear shock absorber adjustment and overhaul, swingarm maintenance. Steering: Handlebar, steering head bearings inspection and adjustment, steering lock. Wheels And Tires: Tire pressure, wheel bearing inspection and replacement, rim specifications, spoke tension (if applicable). Electrical System: Lighting (headlight, taillight, turn signals), horn, battery maintenance, fuses, switches, instrument cluster troubleshooting. Bodywork And Frame: Fairing removal and installation, seat, fuel tank, body panel fasteners, frame inspection, chassis alignment. Procedures Included Routine Maintenance: Oil change, filter replacement, spark plug replacement, chain adjustment, brake inspection, tire pressure checks, air filter cleaning/replacement. Troubleshooting: Diagnostic charts for common issues, symptom-based problem solving for engine, electrical, and mechanical systems. Engine Rebuilding: Complete step-by-step instructions for engine disassembly, component inspection, repair, and reassembly. Electrical Diagnostics: Testing procedures for all electrical components, including use of multimeters and diagnostic tools. Suspension Service: Fork oil change, seal replacement, shock absorber servicing. Brake System Service: Bleeding, pad replacement, caliper and master cylinder overhaul. Carburetor Tuning: Detailed instructions for jetting, idle speed, and mixture adjustments. Wiring Diagrams: Complete and detailed electrical schematics for all factory equipment. Technical Depth Depth: Comprehensive. Covers everything from basic scheduled maintenance and routine checks to complete engine rebuilds, transmission overhauls, and detailed electrical system diagnostics. 📊 Manual Specifications File Format File Type: PDF Print Quality Quality: Downloadable PDF typically offers high resolution, ensuring clear text and diagrams. Ability to print at original quality. Binding Type Binding: N/A (Digital PDF) Paper Type Paper: N/A (Digital PDF) Searchability Text Searchable: Typically, factory PDF manuals are text-searchable, allowing users to quickly find specific topics. ⚙️ Engine Specifications Primary Engine Engine Type: Two-stroke, single-cylinder Displacement: 124.8 cc (approximately) Bore X Stroke: 54 mm x 54.5 mm (typical for Rotax 122 engine) Cooling System: Liquid-cooled Valve Train: Reed valve induction, electronically controlled exhaust valve (APCS - Aprilia Power Combustion System) Performance Horsepower: Typically around 30-34 HP at the crank, depending on market restrictions (e.g., 15 HP in some European markets for learner riders). Torque: Approximately 22-25 Nm (16-18 lb-ft) at the crank. Fuel System Carburetor: Dell'Orto PHBH 28 (common fitment), or similar 28mm carb. Later models may have used different configurations. The manual will specify the exact type. Fuel Type: Unleaded gasoline, minimum 95 RON (premium) Lubrication Oil System: Premix or separate oil injection system (manual will specify and cover maintenance). 🔧 Transmission Standard Type: 6-speed sequential manual transmission Optional Optional Types: N/A (Standard for this model) Features Clutch Type: Wet multi-plate clutch Gear Ratios: Specific gear ratios are detailed in the manual, crucial for performance tuning and maintenance. Final Drive: Chain drive 📐 Dimensions Exterior Length: Approximately 1970 mm Width: Approximately 730 mm (at handlebars) Height: Approximately 1060 mm (at seat) Wheelbase: Approximately 1345 mm Weights Dry Weight: Approximately 130-135 kg (this manual will provide the precise figure) Fuel Tank Capacity: Approximately 13 liters 🛡️ Safety...