🏷️ Basic Information Identification Make: Aprilia Model: RS125 Year: 1998 Codes Internal Model Code: AP98RS125 👋 Introduction Market Position Segment: Lightweight sport motorcycle segment, popular for track days and street performance. Competitive Analysis Competitors: Yamaha YZF-R125, Honda CBR125R, Suzuki GSX-R125, Cagiva Mito 125. Key Features Performance Focus: High-revving two-stroke engine, aggressive styling, sporty handling. Target Audience: Young riders seeking a performance-oriented and stylish motorcycle. Manual Value Utility: Essential for owners and technicians to perform accurate maintenance, diagnostics, and repairs, ensuring longevity and optimal performance. 📋 Manual Details Coverage Areas Primary Coverage: Mechanical Systems, Electrical Systems, Bodywork, Troubleshooting Regional Coverage: Global (International Specifications) Page Count Estimated Pages: 300-400 Manual Type Type: Factory Service Repair Manual Language Language: English Format Format: Downloadable PDF 📖 Manual Coverage Systems Covered Engine Mechanical: Complete disassembly, inspection, repair, and reassembly of the Rotax 125cc two-stroke engine. Fuel System: Carburetor (Dell'Orto PHBH 28 QD) tuning, cleaning, and overhaul; fuel tank and lines inspection. Ignition System: CDI ignition system, stator, ignition coil, spark plug specifications and testing. Cooling System: Radiator, coolant hoses, thermostat, water pump maintenance and repair. Transmission Drivetrain: 6-speed sequential gearbox, clutch operation and adjustment, chain drive maintenance. Suspension: Front telescopic fork (Showa/Marzocchi variations) overhaul, oil change, and adjustments. Rear monoshock absorber (Sachs/Ohservations) inspection and service. Braking System: Front and rear hydraulic disc brakes, caliper service, master cylinder overhaul, brake fluid bleeding, pad replacement. Electrical System: Wiring diagrams, battery service, lighting system, starter motor, charging system testing and repair. Bodywork Chassis: Fairing removal and installation, seat maintenance, frame inspection, steering head bearing service. Procedures Included Preventative Maintenance: Scheduled maintenance tasks, fluid changes, filter replacements, general inspection guidelines. Troubleshooting: Diagnostic charts and procedures for common issues and malfunctions across all systems. Engine Rebuild: Detailed step-by-step instructions for complete engine teardown and rebuild, including piston, cylinder, crankshaft, and bearing replacement. Carburetor Tuning: Jetting charts, idle speed adjustment, mixture screw settings, and float height calibration. Suspension Adjustment: Preload, compression, and rebound damping adjustments for front and rear suspension. Electrical Diagnostics: Component testing using multimeters, fuse identification, and troubleshooting electrical faults. Wheel Tire Service: Tire pressure recommendations, wheel balancing, and axle maintenance. Technical Depth Depth: Comprehensive: Covers everything from basic fluid changes and checks to complete engine and transmission rebuilds, advanced electrical diagnostics, and suspension tuning. 📊 Manual Specifications File Format File Type: PDF Searchability: Searchable text content for quick information retrieval. Print Quality Quality: High-resolution scans ensuring clarity of diagrams, schematics, and text. Binding Type Binding: N/A (Digital PDF Download) Paper Type Paper Type: N/A (Digital PDF Download) ⚙️ Engine Specifications Primary Engine Engine Type: Rotax 125cc, Liquid-Cooled, 2-Stroke, Single-Cylinder Bore X Stroke: 54 mm x 54.5 mm Compression Ratio: 12.0:1 Valve Mechanism: Reed Valve Intake, Exhaust Power Valve (Rotax A.P.C.S.) Performance Horsepower: Approx. 30-33 HP (depending on market restrictions) Torque: Approx. 21 Nm (15.5 lb-ft) at 8,000 RPM Fuel System Carburetor Model: Dell'Orto PHBH 28 QD Fuel Type: Unleaded Gasoline (95 RON Recommended) Lubrication Lubrication System: Separate Oil Injection System 2T Oil Type: API TC+, JASO FD certified Fully Synthetic 2-Stroke Oil 🔧 Transmission Standard Gearbox Type: 6-Speed Sequential Manual Clutch Type: Wet Multi-Plate Clutch Features Drive Type: Chain Drive Final Drive Ratio: 17/44 (Standard) 📐 Dimensions Exterior Length: Approx. 1,950 mm (76.8 in) Width: Approx. 720 mm (28.3 in) Height: Approx. 1,130 mm (44.5 in) Weights Dry Weight: Approx. 120 kg (264.5 lbs) Fuel Tank Capacity: Approx. 7.2 Liters (1.9 US gal) Oil Tank Capacity: Approx. 1.5 Liters (0.4 US gal) 🛡️ Safety Features Ratings Crash Test Data: N/A (Motorcycle specific safety is determined by design and rider input) Active Features Braking System: Dual Piston Front Caliper, Single Piston Rear Caliper, Hydraulic Disc Brakes Suspension Dynamics: Sport-tuned suspension for stability and control during cornering. Passive Features Chassis Design: Sturdy perimeter frame for torsional rigidity. Ergonomics: Sportbike riding position, providing rider feedback and control. 💡 Technology Features Infotainment Display: Analog Tachometer, Speedometer, Odometer, Fuel Gauge, Temperature Gauge (integrated into instrument cluster). Driver Assistance ABS: Not available on the 1998 model. Connectivity Bluetooth Usb: Not available on the 1998 model. 🔧 Maintenance Service Intervals Oil Change Interval: Every 3,000 km or annually. (Refer to manual for specific details) Spark Plug Replacement: Every 6,000 km or as per manual recommendation. Air Filter Cleaning: Every 3,000 km, cleaning or replacement as needed. Chain Lubrication Adjustment: Every 500 km or after riding in wet conditions. Fluid Specifications Engine Oil Type: Refer to manual for specific 2T oil; Crankcase Oil: SAE 75W/90 (or equivalent API GL-4/GL-5 gear oil for gearbox) Coolant Type: Mixture of Ethylene Glycol Antifreeze and Distilled Water (50/50 mix recommended) Brake Fluid Type: DOT 4 Hydraulic Brake Fluid Fork Oil Type: SAE 10W (or specified by manual for Showa/Marzocchi forks) Known Issues Common Wear Items: Clutch plates, piston rings, exhaust power valve (carbon build-up), chain and sprockets, fork seals, wheel...