🏷️ Basic Information Identification Make: Aprilia Model: RS125 Year: 1998 Codes Chassis Code: RS 125 (Rotax 122) 👋 Introduction Market Position Bike Segment: Lightweight sportbike / Supersport Target Audience: Enthusiasts seeking performance, handling, and track-day capability in a manageable package. Competitive Analysis Key Competitors: Yamaha YZF-R125 (later models), Cagiva Mito 125, Honda NSR125R, Suzuki RG125F Key Features Design Philosophy: Aggressive, race-inspired styling and performance orientation. Engine Type: High-performance two-stroke, liquid-cooled 📋 Manual Details Coverage Areas Systems Covered: Engine, Fuel System, Ignition System, Cooling System, Lubrication System, Transmission, Clutch, Chassis, Suspension (Front & Rear), Brakes (Front & Rear), Electrical System, Wiring Diagrams, Bodywork, Frame, Tools & Equipment, Troubleshooting, Maintenance Page Count Page Count: Estimated 300-400 pages (typical for comprehensive service manuals) Manual Type Manual Type: Service Repair Workshop Manual Language Language: English Format Format: Digital (PDF) 📖 Manual Coverage Systems Covered Engine Overhaul: Detailed procedures for engine disassembly, inspection, repair, and reassembly of the Rotax 122 engine. Fuel System Servicing: Carburetor tuning and rebuilding (Dell'Orto PHBH 28/29/30), fuel pump, fuel lines, and fuel tank maintenance. Ignition System Diagnostics: Ignition timing, spark plug specifications, CDI unit testing, and stator/rotor inspection. Cooling System Maintenance: Radiator, hoses, water pump, thermostat replacement, and coolant specifications. Transmission And Clutch: Gearbox overhaul, clutch plate replacement, clutch cable adjustment, and transmission oil specifications. Suspension And Steering: Front fork (Marzocchi/Paioli) service and seal replacement, rear shock absorber adjustment and replacement, steering head bearing service. Braking System Service: Brake pad replacement, caliper service, master cylinder overhaul, brake fluid specifications (DOT 4), and bleeding procedures. Electrical System Troubleshooting: Comprehensive wiring diagrams, battery testing, starter motor, lighting system, and switchgear diagnostics. Procedures Included Routine Maintenance: Oil changes, filter replacements (air, fuel), chain cleaning and lubrication, tire pressure checks, brake adjustments. Major Repairs: Engine rebuild, gearbox disassembly, suspension fork rebuild, carburetor overhauls, electrical component replacement. Troubleshooting Guides: Diagnostic flowcharts and common problem resolution for starting issues, performance problems, electrical faults. Specifications And Tolerances: Precise measurements, torque values, and wear limits for all major components. Technical Depth Depth Of Coverage: Comprehensive. Suitable for both DIY enthusiasts performing routine maintenance and professional mechanics undertaking complete rebuilds. 📊 Manual Specifications File Format File Format: PDF Searchable Text: Yes (typically) Printable: Yes Print Quality Image Resolution: High-resolution, suitable for clear viewing of diagrams and illustrations. Binding Type Binding Type: N/A (Digital) Paper Type Paper Type: N/A (Digital) ⚙️ Engine Specifications Primary Engine Engine Type: Rotax 122 (two-stroke, single-cylinder) Displacement: 124.8 cc Bore X Stroke: 54 mm x 54.5 mm Compression Ratio: 12.0:1 Cooling System: Liquid-cooled Power Output: Approx. 30-32 hp @ 11,000 rpm (depending on market restrictions) Torque Output: Approx. 19-20 Nm @ 10,000 rpm Performance Top Speed: Approx. 140-150 km/h (87-93 mph) Fuel System Carburetor: Dell'Orto PHBH 28/30 (dual jet) Fuel Type: Unleaded gasoline (95 RON minimum) Oil Mixing: Automatic oil injection system 🔧 Transmission Standard Transmission Type: 6-speed constant mesh Clutch Type: Wet multi-plate Features Gear Ratios: Refer to manual for specific ratios for each gear. Final Drive: Chain drive (520 pitch) 📐 Dimensions Exterior Length: Approx. 1950 mm Width: Approx. 750 mm Height: Approx. 1100 mm Wheelbase: Approx. 1370 mm Weights Dry Weight: Approx. 130 kg Fuel Tank Capacity: 10 Liters (2.6 US gal) 🛡️ Safety Features Ratings Crash Safety Ratings: N/A (Motorcycles are not typically rated by agencies like NHTSA/Euro NCAP in the same way as cars). Active Features Braking System: Hydraulic disc brakes front and rear. Typically single disc front with 2-piston caliper, single disc rear with 1-piston caliper. Suspension Stability: Tuned for sporty handling and stability. Passive Features Chassis Construction: Aluminum alloy twin-spar frame for rigidity. Lighting: Halogen headlight, LED taillight. 💡 Technology Features Infotainment Instrument Cluster: Analog tachometer, speedometer, odometer, trip meter, and warning lights. Driver Assistance ABS: Not typically equipped with ABS on this model year. Connectivity Electronic Aids: Minimal; focused on mechanical performance. Features like an electric starter are standard. 🔧 Maintenance Service Intervals Oil Change Interval: Every 3,000-5,000 km or annually (refer to manual for specific guidance, especially concerning two-stroke oil). Spark Plug Replacement: Typically every 5,000-10,000 km, depending on plug type and usage. Chain Lubrication: Every 500-800 km and after riding in wet conditions. Fluid Specifications Engine Oil Type: High-quality 2-stroke motorcycle oil (synthetic recommended for best performance and longevity). Transmission Oil Type: API GL-4 or GL-5 SAE 75W/90 or SAE 80W/90 gear oil (refer to manual for exact specification). Coolant Type: Ethylene glycol-based antifreeze/coolant, typically a 50/50 mix with distilled water. Brake Fluid Type: DOT 4 (fully synthetic). Known Issues Power Valve Sticking: The exhaust powervalve can accumulate carbon deposits and stick, leading to poor performance. Requires periodic cleaning. Carburetor Tuning: Dell'Orto carburetors can be sensitive to altitude and atmospheric changes, requiring occasional tuning. Clutch Wear: Clutch plates can wear over time, especially with aggressive riding, leading to slipping. Electrical Gremlins: Older wiring harnesses can...