🏷️ Basic Information Identification Make: Aprilia Model: MX 125 Model Year: 2003 Codes Engine Code: Rotax 122 👋 Introduction Market Position Target Audience: Aprilia MX 125 M.Y.2003 owners, mechanics, and service technicians. Key Features Unique Selling Points: Official manufacturer-written documentation, comprehensive coverage of all major systems, detailed diagrams. Manual Value Purpose: To provide the most accurate and complete diagnostic, repair, and maintenance information for the Aprilia MX 125 M.Y.2003. 📋 Manual Details Coverage Areas Comprehensive Coverage: Diagnostic, Repair, and Maintenance Page Count Total Pages: 139 Manual Type Type: Workshop Service Repair Manual Language Language: English Format File Format: PDF 📖 Manual Coverage Systems Covered Engine System: Engine from vehicle, Engine, Power Supply, Cooling System Chassis And Suspension: Suspensions, Chassis, Braking System Electrical System: Electrical System, Wiring Diagrams Bodywork And Cosmetics: Bodywork Procedures Included Routine Maintenance: Pre-Delivery Checks, Regular Maintenance Procedures Diagnostics: Troubleshooting Guides, Fault Diagnosis Repair And Rebuild: Component Disassembly, Assembly, and Repair Procedures Technical Depth Level Of Detail: Professional Technician Level with Detailed Diagrams and Specifications 📊 Manual Specifications File Specifications PDF Quality: High-resolution, searchable text Printability: Printable pages for workshop use Compatibility Operating Systems: All Versions of Windows & Mac Requirements Software Needed: Adobe PDF Reader ⚙️ Engine Specifications Primary Engine Engine Type: 2-stroke, single cylinder, liquid-cooled Displacement: 124.8 cc Performance Bore X Stroke: 54 x 54.5 mm Compression Ratio: 8.4:1 Power Output: Approx. 33.6 HP (24.7 kW) @ 11,500 rpm (Varies by market and tuning) Torque: Approx. 2.25 kgm (22.1 Nm) @ 10,500 rpm (Varies by market and tuning) Fuel System Carburetor: Dell'Orto VHSH 30 CS (or similar) Fuel Type: Unleaded gasoline (minimum octane rating usually 95) Lubrication Premix Ratio: 1:50 (2-stroke oil to gasoline), consult manual for specific oil type. Ignition Ignition System: Digital electronic ignition with variable advance 🔧 Transmission Standard Transmission Type: 6-speed constant mesh Features Clutch: Wet multi-plate clutch Final Drive: Chain drive 📐 Dimensions Exterior Length: Approx. 2130 mm Width: Approx. 800 mm Height: Approx. 1170 mm Seat Height: Approx. 870 mm Weights Dry Weight: Approx. 105 kg Fuel Tank Capacity: Approx. 8.5 Liters 🛡️ Safety Features Active Features Braking System Front: Hydraulic disc brake, Ø 260 mm Braking System Rear: Hydraulic disc brake, Ø 220 mm Passive Features Frame Type: Steel perimeter frame 💡 Technology Features Infotainment Instrumentation: Analog tachometer, speedometer, odometer, and basic indicator lights. Driver Assistance Electronic Aids: None (typical for this class of off-road/motard bike). 🔧 Maintenance Service Intervals Oil Change Recommendation: Consult manual for specific intervals, typically every 3,000-5,000 km for the gearbox oil. Spark Plug Check: Regular inspection and replacement as per manual recommendations. Air Filter Cleaning: Frequent cleaning/replacement, especially in dusty conditions, as detailed in the manual. Fluid Specifications Engine Oil Type: Specific 2-stroke premix oil (API TC, JASO FD recommended). Consult manual for exact specification. Gearbox Oil Type: API GL-4 SAE 75W/90 or similar gearbox oil. Consult manual for capacity and specification. Coolant Type: Ethylene glycol based coolant with corrosion inhibitors. Consult manual for mix ratio and type. Known Issues Common Wear Items: Clutch plates, piston rings, carburetor jets, exhaust packing. Maintenance Priority: Proper carburetor tuning and consistent 2-stroke oil mixing are critical for engine longevity. 📚 Vehicle History Brand Heritage Aprilia Motorsport: Aprilia has a rich heritage in motorcycle racing, particularly in off-road and Grand Prix disciplines, influencing their sport-oriented models. Model Evolution Mx Series Development: The MX series represents Aprilia's foray into the motocross and supermoto segments, often featuring advanced engines and chassis for their class. Production Manufacturing Location: Italy 🏆 Awards & Recognition Recognitions Model Reputation: The Aprilia MX 125 is known for its performance-oriented chassis and potent 2-stroke engine, making it a popular choice for its segment.