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Introduction
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Market Position
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Motorcycle Segment:
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Lightweight sportbike, popular among younger riders and for track day use due to its performance and handling characteristics.
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Competitive Analysis
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Competitors 2002:
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Yamaha YZF-R125 (later models), Honda CBR125R, Suzuki GSX-R125, Kawasaki Ninja 125.
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Key Features
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Aprilia Rs125 Reputation:
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Renowned for its sharp styling, aggressive riding posture, potent two-stroke engine (in many variants), and excellent chassis dynamics, often considered a 'baby superbike'.
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Manual Value Proposition
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Diy Support:
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Empowers owners to perform their own maintenance and repairs, saving on labor costs and fostering a deeper understanding of the machine.
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Manual Coverage
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Systems Covered
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Engine Systems:
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Engine assembly/disassembly, cylinder head, piston, crankshaft, lubrication, cooling (if applicable), ignition system, fuel injection/carburetion system, exhaust system.
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Transmission And Drivetrain:
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Gearbox assembly/disassembly, clutch operation and service, final drive (chain and sprockets).
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Chassis And Suspension:
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Front fork (telescopic, upside-down), rear shock absorber, swingarm, frame, steering system, wheel bearings.
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Braking System:
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Front and rear brake calipers, master cylinders, brake lines, brake fluid, disc servicing.
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Electrical System:
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Wiring diagrams, battery, starter motor, alternator/stator, lighting system (headlight, taillight, indicators), instrumentation, ignition coils, ECUs.
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Fuel System:
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Fuel tank, fuel lines, fuel pump (if applicable), carburetor(s) or fuel injector(s), throttle control.
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Bodywork And Trim:
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Fairings, seat, fuel tank cover, fenders, levers, footpegs, mirrors.
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Procedures Included
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Maintenance Procedures:
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Routine maintenance checks, oil changes, filter replacements, chain adjustment, brake pad inspection, coolant checks (if liquid-cooled), spark plug replacement, air filter cleaning/replacement.
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Repair Procedures:
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Complete engine rebuilds, gearbox overhauls, suspension fork servicing, brake system repairs, electrical component replacement, bodywork panel repairs and installation.
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Troubleshooting Guides:
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Diagnostic procedures for common issues, symptom-based troubleshooting charts.
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Specifications And Data:
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Torque values, clearances, fluid capacities, electrical resistance values, diagnostic trouble codes (DTCs).
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Special Tools:
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Identification and use of specialized tools required for specific repair operations.
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Technical Depth
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Depth Of Information:
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Highly detailed, covering complete disassembly and reassembly of all major components, suitable for both DIY enthusiasts and professional mechanics.
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Engine Specifications
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Primary Engine
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Engine Type:
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Two-stroke, single-cylinder (common for RS125, though some later Rotax 125 engines were liquid-cooled).
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Displacement:
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124.8 cc (approx.)
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Bore X Stroke:
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54 mm x 54.5 mm (typical for Rotax 123/122 engines).
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Cooling System:
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Liquid-cooled (Radiator and fan).
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Valvetrain:
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Reed valve induction, Rotary disc valve (on crankshaft), Power valve system (e.g., RSV).
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Performance
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Horsepower Output:
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Approximately 30-34 HP (depending on market restrictions and specific engine tune).
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Torque Output:
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Approximately 2.0-2.2 kgf-m (14.5-16.0 lb-ft) at 7,000-8,000 RPM.
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Fuel System
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Carburetor Type:
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Dell'Orto VHST 28 or similar performance carburetor.
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Fuel Grade Recommendation:
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Premium Unleaded Gasoline (95 RON or higher).
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Oil Mixing Ratio:
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Typically 1:20 to 1:30 (premix or oil injection system) with high-quality 2-stroke synthetic oil.
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Maintenance
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Service Intervals
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Oil Change Interval:
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Every 3,000-5,000 km (1,800-3,000 miles) or annually, depending on usage and oil type. Critical for 2-stroke longevity.
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Spark Plug Replacement:
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Every 5,000-10,000 km (3,000-6,000 miles), depending on plug type and usage. Manual will specify recommended spark plug models and gap.
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Chain Maintenance:
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Lubricate and adjust chain every 500-1,000 km (300-600 miles). Check for wear and tension.
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Fluid Specifications
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Engine Oil 2Stroke:
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High-quality 2-stroke synthetic oil (e.g., Motul 7100 2T, Castrol Power 1 Racing 2T). Manual will specify API/JASO ratings.
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Coolant Type:
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Ethylene glycol based antifreeze mixed with distilled water (50/50 ratio). Manual specifies specific type.
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Brake Fluid Type:
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DOT 4 or DOT 5.1 brake fluid (check manual for exact specification). Flush and replace every 2 years.
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Gearbox Oil Type:
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Manual transmission fluid (e.g., SAE 75W-90 or 80W-90). Manual will specify API GL-4 or GL-5 rating and capacity.
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Known Issues
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Common Wear Items:
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Piston rings, clutch plates, fork seals, power valve mechanisms, electrical connectors.
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Power Valve Maintenance:
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Requires regular cleaning to prevent carbon buildup and ensure proper operation, critical for consistent performance.
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Carburetor Tuning:
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Can be sensitive to atmospheric conditions and modifications; requires proper jetting and setup. Manual provides baseline settings.
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