🏷️ Basic Information Identification Make: Aprilia Model: RS 125 Model Code: RS 125 (Rotax 122) Generation Generation Years: 1999-2004 Codes Vin Prefix: ZDA 👋 Introduction Market Position Positioning: Performance-oriented lightweight sportbike, popular for track days and street riding, known for its potent Rotax engine. Competitive Analysis Competitors: Yamaha YZF-R125, Cagiva Mito 125, Honda CBR125R. Key Features Engine Performance: Free-revving 2-stroke single-cylinder, powerful for its displacement class. Handling: Excellent chassis dynamics, capable suspension, sharp steering geometry. Design: Aggressive sportbike styling mimicking larger Aprilia RSV models. Manual Value Cost Savings: Significant savings on dealership service fees for maintenance, repairs, and diagnostics. Diy Empowerment: Enables owners to perform their own maintenance and repairs, fostering a deeper understanding of the machine. 📋 Manual Details Coverage Areas Language: English Format: Digital Download (PDF) Page Count Page Count: 300+ Manual Type Manual Type: Service & Repair Workshop Manual 📖 Manual Coverage Systems Covered Engine Mechanical: Full rebuild procedures, piston, cylinder, crankshaft, bearings, seals, timing (rotary valve). Fuel System: Carburetor (Dell'Orto PHBH/PHBL series) tuning, jetting, cleaning, fuel pump, fuel lines, fuel tank maintenance. Ignition System: CDI ignition, stator, rotor, spark plug specifications, troubleshooting. Cooling System: Liquid cooling, radiator, water pump, thermostat, coolant specifications and bleeding procedures. Exhaust System: Expansion chamber, silencer, gaskets, maintenance. Transmission Drivetrain: Clutch operation, gearbox disassembly/assembly, gear selection, lubrication, chain drive maintenance. Chassis Frame: Frame inspection, welding points, frame geometry. Suspension Front: Upside-down telescopic forks (e.g., Marzocchi), oil type, level, seal replacement, damping adjustments. Suspension Rear: Monoshock, linkage system, shock absorber servicing, spring pre-load adjustment. Brakes Front: Brake caliper (e.g., Brembo), master cylinder, brake lines, disc specifications, pad replacement, fluid type and bleeding. Brakes Rear: Brake caliper, master cylinder, brake lines, disc specifications, pad replacement, fluid type and bleeding. Wheels Tires: Wheel bearing maintenance, tire pressure specifications, rim specifications. Electrical System: Wiring diagrams, lighting system, horn, battery specifications, charging system, starter motor, troubleshooting. Bodywork Plastics: Fairing removal and installation, seat, fuel tank cover, body panel fasteners. Controls Cables: Throttle cable, clutch cable, brake lever adjustment, operation. Procedures Included Preventive Maintenance: Oil changes, filter replacements, chain lubrication and adjustment, spark plug checks, fluid level checks. Troubleshooting: Diagnostic procedures for common problems (e.g., starting issues, poor running, electrical faults). Engine Rebuild: Complete engine overhaul, component replacement, torque specifications for critical fasteners. Suspension Servicing: Fork seal replacement, fork oil change, shock absorber service. Brake System Overhaul: Master cylinder rebuild, caliper servicing, bleeding procedures. Carburetor Tuning Rebuild: Detailed instructions for Dell'Orto PHBH/PHBL series, including jetting charts and float height adjustment. Electrical Diagnosis: Step-by-step guides for diagnosing electrical faults using wiring diagrams. Cooling System Service: Coolant flush, replacement, and bleeding procedures. Technical Depth Depth: Comprehensive: Covers basic maintenance to full engine and chassis rebuilds, including detailed specifications and troubleshooting. 📊 Manual Specifications File Format File Type: PDF Searchability: Searchable text Print Quality: High resolution, printable pages Binding Type Binding: Not applicable (Digital Download) Paper Type Paper: Not applicable (Digital Download) ⚙️ Engine Specifications Primary Engine Engine Type: 2-stroke, single cylinder, liquid-cooled, reed valve induction. Engine Code: Rotax 122 E (and variations) Bore X Stroke: 54 mm x 54.5 mm Displacement: 124.8 cc Compression Ratio: 12.5:1 (approx.) Valvetrain: Reed valve intake, exhaust port controlled by rotary valve (APTS - Aprilia Performance Powerup System). Performance Horsepower Peak: Approx. 30-34 HP @ 11,000 RPM (varies by market and specific model year/tuning). Torque Peak: Approx. 18-20 Nm @ 10,000 RPM (varies). Fuel System Carburetor Model: Dell'Orto PHBH 28 (often with dual-pull throttle cable) or PHBL 26. Fuel Type: Unleaded gasoline, minimum 95 RON (octane rating). Fuel Mixture: Automatic oil injection system (separate oil tank). Oil Type: 2-stroke synthetic oil specifically for high-performance motorcycles. 🔧 Transmission Standard Transmission Type: 6-speed constant mesh, sequential manual gearbox. Features Clutch Type: Wet multi-plate clutch, cable-operated. Final Drive: Chain drive (DID 520 type). Gear Ratios: Specific ratios detailed in the manual (e.g., 1st: 2.538, 2nd: 1.765, 3rd: 1.333, 4th: 1.087, 5th: 0.957, 6th: 0.850). Transmission Oil Type: API GL-4 or GL-5 SAE 75W/90 synthetic gear oil. 📐 Dimensions Exterior Length: Approx. 2,010 mm (79.1 in) Width: Approx. 720 mm (28.3 in) Height: Approx. 1,135 mm (44.7 in) Wheelbase: Approx. 1,345 mm (53.0 in) Seat Height: Approx. 810 mm (31.9 in) Weights Dry Weight: Approx. 131 kg (289 lbs) Wet Weight: Approx. 145 kg (320 lbs) (with fluids) Fuel Tank Capacity: 12 Liters (3.17 US gal) 🛡️ Safety Features Ratings Safety Ratings: N/A (Motorcycle safety ratings are typically performance-based and not comparable to automotive crash test ratings). Active Features Braking System: Hydraulic disc brakes front and rear, often with Brembo components. Lighting: Full lighting system (headlight, taillight, brake lights, turn signals). Passive Features Frame Construction: Aluminum alloy twin-spar frame for rigidity and light weight. 💡 Technology Features Infotainment Infotainment System: N/A (Motorcycle of this era features a basic analog instrument cluster). Performance Enhancement Rotax Apts System: Aprilia Performance Powerup...