🏷️ Basic Information Identification Make: Aprilia Model: RS 125 Year: 1997 Generation Model Generation: First Generation (Rotax 122) Codes Engine Code: Rotax 122 (often referred to as 122 EGS or similar variants) 👋 Introduction Market Position Motorcycle Segment: Lightweight sportbike, entry-level performance Competitive Analysis Key Competitors 1997: Yamaha YZF-R125 (though R125 came later, similar displacement class competitors like Cagiva Mito 125, Honda NSR125R, Suzuki RG125 GAMMA) Key Features Design Philosophy: Aggressive styling, sporty handling, performance-oriented 2-stroke engine, representing a premium offering in the 125cc class. Target Audience: Young riders, those seeking a stylish and fun-to-ride motorcycle with a performance edge, often favored for track days or spirited road riding. 📋 Manual Details Coverage Areas Manual Coverage Scope: Comprehensive service, repair, maintenance, and restoration Page Count Estimated Page Count: Likely 200-400 pages (typical for a full service manual of this era) Manual Type Manual Type: Full Service and Repair Manual Language Language: Likely English (standard for international markets, potentially others depending on origin) Format Digital Format: PDF (assumed for modern digital sales, original may have been printed) 📖 Manual Coverage Systems Covered Engine System Coverage: Engine disassembly, assembly, tuning, cooling system, lubrication system, fuel system (carburetor), exhaust system, starting system, ignition system (CDI), 2-stroke specific lubrication (oil injection). Drivetrain Coverage: Clutch (multi-plate wet), gearbox (6-speed), final drive (chain), gearbox oil specifications. Chassis Coverage: Frame, swingarm, suspension (front telescopic forks, rear monoshock), steering head, wheels, hubs, spokes, bearings. Braking System Coverage: Front and rear disc brake systems, hydraulic components, caliper maintenance, pad replacement, fluid specifications (DOT 3/4), bleeding procedures. Electrical System Coverage: Wiring diagrams, lighting systems (headlight, taillight, turn signals), battery, charging system (alternator/stator), starter motor, fuses, switches, instrumentation. Procedures Included Maintenance Procedures: Regular servicing, oil changes (gearbox, 2-stroke injection), filter replacements (air, fuel), spark plug checks, chain adjustment, brake checks, general cleaning and lubrication. Repair Procedures: Engine rebuild (top-end and bottom-end), carburetor overhaul, suspension fork service, brake caliper rebuild, electrical component replacement, chassis component repairs. Troubleshooting Guides: Diagnostic procedures for common starting, running, electrical, and braking issues, often with symptom-based flowcharts. Technical Depth Diagnostic Capabilities: Detailed diagnostic information for engine performance, electrical faults, and chassis issues, including specific measurements and tolerances. Rebuild Level: Complete engine and gearbox rebuilds, including specifications for piston rings, crankshaft, bearings, seals, and clutch components. Torque Specifications: Precise torque values for all critical fasteners, including cylinder head bolts, crankcase bolts, wheel nuts, and brake caliper mounting bolts. 📊 Manual Specifications File Format Digital File Type: PDF (Portable Document Format) Print Quality Digital Image Resolution: High resolution (typically 300 DPI or higher for clarity of diagrams and text) Binding Type Original Binding Style: Likely saddle-stitched or perfect bound (for printed versions) Paper Type Original Paper Quality: Heavyweight, semi-gloss paper stock (common for workshop manuals to withstand use). ⚙️ Engine Specifications Primary Engine Engine Type: Liquid-cooled, 2-stroke, single-cylinder Displacement: 125 cc (cubic centimeters) Bore X Stroke: Typically 54 mm x 54.5 mm (check specific manual for exact figure) Compression Ratio: Around 12.5:1 (subject to specific variant and tuning) Performance Horsepower: Approximately 30-33 HP (depending on homologation and market restrictions) Torque: Approximately 18-20 Nm (Newton-meters) (at peak RPM) Fuel System Carburetor Type: Dell'Orto VHSH 30 CS (common specification, can vary) Fuel Type: Unleaded gasoline (RON 95 or higher recommended) Oil System 2 Stroke Oil Injection: Automatic oil injection system for pre-mixing 2-stroke oil with fuel. Cooling System Cooling Method: Liquid cooling with radiator and fan. 🔧 Transmission Standard Transmission Type: 6-speed constant mesh sequential gearbox. Optional Clutch Type: Multi-plate wet clutch. Features Gear Ratios: Specific gear ratios will be detailed in the manual, crucial for performance tuning. Gearbox Oil Spec: API GL-4, SAE 80W/90 hypoid gear oil is typical (verify with manual). 📐 Dimensions Exterior Length: Approximately 1950 mm (check specific manual) Width: Approximately 740 mm (handlebar width, check specific manual) Height: Approximately 1100 mm (seat height, check specific manual) Weights Dry Weight: Approximately 131 kg (dry weight) Fuel Tank Capacity: Approximately 12 Liters Oil Tank Capacity: Approximately 1.2 Liters (for 2-stroke oil injection) 🛡️ Safety Features Ratings Crash Test Standards: Motorcycles of this era did not typically undergo standardized crash testing like automobiles. Active Features Braking System Type: Dual disc front, single disc rear (standard for performance). Tires Front: Typically 110/70-17 (verify with manual for exact spec) Tires Rear: Typically 150/60-17 (verify with manual for exact spec) Passive Features Lighting System: Halogen headlight, LED or incandescent taillight and indicators. 💡 Technology Features Infotainment Instrument Cluster: Analog tachometer, speedometer, odometer, and warning lights. Basic but functional for its era. Driver Assistance ABS Availability: ABS was not a standard or common option on 125cc sportbikes of this vintage. Connectivity Connectivity Features: None (motorcycle technology of this era did not include digital connectivity). 🔧 Maintenance Service Intervals Oil Change Interval Gearbox: Every 5,000-10,000 km or annually (refer to manual for precise interval)....