🏷️ Basic Information Identification Make: Aprilia Model: RS250 Year: 1998 Manual Product Name: 1998 Aprilia RS250 Factory Service Repair Manual 👋 Introduction Market Position Positioning: The Aprilia RS250 was a highly regarded, lightweight, and potent supersport motorcycle, celebrated for its racing pedigree and performance. It occupied a niche market segment of pure sportbikes, often compared to its Suzuki RG250 Gamma roots. Competitive Analysis Competitors: Competed against other 250cc two-stroke sportbikes of the era such as the Yamaha TZR250, Kawasaki KR-1/KR-1S, and Suzuki RGV250. Key Features Performance Highlights: High-revving two-stroke engine, excellent power-to-weight ratio, agile handling, advanced suspension and braking for its class, racing-derived chassis. 📋 Manual Details Coverage Areas Engine: Yes Transmission: Yes Chassis: Yes Electrical System: Yes Suspension: Yes Brakes: Yes Fuel System: Yes Cooling System: Yes Exhaust System: Yes Bodywork: Yes Troubleshooting: Yes Maintenance: Yes Specifications: Yes Page Count Estimated Pages: Hundreds (typical for factory service manuals) Manual Type Type: Factory Service Repair Manual Language Language: English (typical for factory manuals distributed internationally) Format Format: Digital (Instant Download, likely PDF) 📖 Manual Coverage Systems Covered Engine Mechanics: Detailed disassembly, assembly, inspection, and repair of the V-twin two-stroke engine, including cylinder head, piston, connecting rod, crankshaft, crankcase, reed valves, and power valve systems. Carburetion: Comprehensive coverage of the dual Mikuni TM34SS flat-slide carburetors, including tuning, cleaning, and jetting specifications. Ignition System: Detailed information on the electronic ignition system, including CDI unit, spark plugs, and troubleshooting ignition faults. Lubrication System: Coverage of the automatic oil injection system, including pump adjustment and troubleshooting. Cooling System: Information on the liquid cooling system, including radiator, water pump, thermostat, and coolant specifications. Transmission: In-depth procedures for clutch operation, gearbox disassembly, inspection, and reassembly, including gear sets, shift drum, and shift forks. Fuel Delivery: Details on the fuel tank, fuel lines, fuel filter, and petcock operation. Electrical Schematics: Complete wiring diagrams for all electrical components, including lighting, ignition, instruments, and charging system. Suspension Front: Full service procedures for the upside-down front fork, including oil change, seal replacement, spring rate information, and damping adjustments. Suspension Rear: Detailed service for the monoshock rear suspension, including linkage disassembly, shock absorber adjustment, and bearing service. Brakes Front: Information on the dual front disc brake system, including caliper overhaul, pad replacement, rotor specifications, and bleeding procedures. Brakes Rear: Coverage of the rear disc brake system, including caliper overhaul, pad replacement, rotor specifications, and bleeding procedures. Wheels And Tires: Specifications for wheel bearings, tire pressures, and recommended tire sizes. Frame And Bodywork: Procedures for removing and installing fairings, seat, fuel tank, and other body panels. Frame inspection and alignment considerations. Instruments And Controls: Information on the speedometer, tachometer, warning lights, and switchgear operation. Procedures Included Routine Maintenance: Oil changes, filter replacements, spark plug checks, chain adjustment, and general inspection procedures. Engine Rebuild: Complete step-by-step instructions for engine disassembly, component inspection, measurement, and reassembly for a full engine overhaul. Carburetor Tuning: Detailed guidance on synchronizing carburetors and adjusting mixture and idle speed for optimal performance. Suspension Rebuild: Instructions for rebuilding both front forks and the rear shock absorber, including seal and oil replacement. Brake System Service: Procedures for bleeding the brake system, replacing brake pads, and servicing brake calipers and master cylinders. Electrical Troubleshooting: Diagnostic steps for common electrical issues, utilizing wiring diagrams to pinpoint faults. Power Valve Adjustment: Guidance on servicing and adjusting the electronically controlled power valve system for proper exhaust scavenging. Clutch Replacement: Step-by-step instructions for clutch plate replacement and adjustment. Technical Depth Depth: Comprehensive, covering all aspects from basic maintenance to complete engine and component overhaul. Suitable for professional mechanics and experienced DIY enthusiasts. 📊 Manual Specifications File Format Format: PDF Print Quality Quality: High-resolution scans of original factory documentation, ensuring clarity of text and diagrams. Binding Type Binding: N/A (Digital Format) Paper Type Paper: N/A (Digital Format) Searchable Text Search: Likely searchable text for quick information retrieval. Illustrations Diagrams And Photos: Includes detailed exploded diagrams, schematics, and potentially photographic illustrations of procedures. ⚙️ Engine Specifications Primary Engine Engine Type: Liquid-cooled, 90-degree V-twin, two-stroke Displacement: 249 cc Bore X Stroke: 54.0 mm x 54.5 mm Compression Ratio: 7.4:1 (typical, subject to revision) Power Valve System: Aprilia Power Exhaust (APEX) system, electronically controlled Performance Horsepower: Approx. 70 HP @ 11,000 RPM (may vary by market) Torque: Approx. 30 lb-ft @ 10,000 RPM (may vary by market) Fuel System Carburetors: 2 x Mikuni TM34SS (flat-slide, twin-pipe) Fuel Type: Unleaded gasoline (95 RON recommended) Lubrication System Oil System: Automatic oil injection Cooling System Coolant Type: Ethylene glycol-based coolant (50% mixture with distilled water) 🔧 Transmission Standard Type: 6-speed sequential, constant mesh Features Clutch: Wet, multi-plate, cable-actuated Final Drive: O-ring sealed chain 📐 Dimensions Exterior Length: Approx. 1990 mm (78.3 in) Width: Approx. 710 mm (28.0 in) Height: Approx. 1110 mm (43.7 in) Wheelbase: Approx. 1365 mm (53.7 in) Weights Dry Weight:...