🏷️ Basic Information Identification Make: Aprilia Model: RS125 Year: 1998 Codes Model Code: RP 👋 Introduction Market Position Motorcycle Segment: Lightweight sportbike. Target Audience: Riders seeking performance and handling in the 125cc class, often for track days or spirited street riding. Competitive Analysis Competitors: Yamaha YZF-R125, Honda CBR125R, Kawasaki Ninja 125 (though some of these are later models). Key Features Design Philosophy: Represents Aprilia's entry into the competitive 125cc sportbike segment, emphasizing aggressive styling and performance. Visual Elements: Often features distinctive Aprilia racing livery and aerodynamic fairings. 📋 Manual Details Coverage Areas Manual Type: Owner's Manual Language: English Format: PDF Downloadable: Yes Compatibility: All versions of Windows & Mac Requirements: Adobe PDF Reader 📖 Manual Coverage Systems Covered Engine: Operation, basic maintenance, lubrication, cooling system. Fuel System: Fuel tank, fuel lines, carburetion setup, fuel filter. Ignition System: Spark plug specifications, ignition timing basics. Exhaust System: Muffler and exhaust pipe information, emissions controls. Transmission: Gearbox operation, clutch adjustment, chain maintenance. Brakes: Brake lever and pedal operation, fluid checks, pad wear indicators. Suspension: Front fork operation, rear shock absorber adjustment, maintenance. Wheels Tires: Tire pressure recommendations, wheel balancing, tire replacement. Electrical System: Battery maintenance, lighting system operation, fuse identification. Controls: Handlebar controls, throttle, clutch, brake levers, foot controls. Bodywork: Fairing components, seat removal, care and cleaning. Procedures Included Routine Maintenance: Oil level checks, chain lubrication, air filter cleaning, spark plug inspection. Troubleshooting: Common starting issues, performance problems, basic electrical faults. Fluid Checks: Engine oil, coolant, brake fluid level and condition checks. Tire Maintenance: Inflation pressure adjustments, visual inspection for wear and damage. Chain Adjustment: Correct slack measurement and adjustment procedures. Cleaning And Storage: Proper methods for cleaning the motorcycle and preparing for storage. Safety Precautions: Guidelines for safe operation and maintenance. Technical Depth Depth Level: Comprehensive owner-level information, including basic maintenance and troubleshooting. Diagnostics: Basic diagnostic guidance for common issues. Repair Scope: Focuses on user-serviceable parts and adjustments, not full mechanical overhauls. 📊 Manual Specifications File Format File Type: PDF Searchable: Likely text-searchable PDF, though not explicitly stated. High likelihood given modern digital manual practices. Print Quality Printability: All pages are printable. Binding Type Binding: Digital download (not physically bound). Paper Type Paper Type: N/A (Digital Format) ⚙️ Engine Specifications Primary Engine Engine Type: Two-stroke, single-cylinder, liquid-cooled. Displacement: 124.8 cc (7.6 cu. in.) Bore X Stroke: 54 mm x 54.5 mm (2.13 in x 2.15 in) Power Output: Approx. 34 hp (25 kW) at 11,000 rpm (depending on market regulations) Torque: Approx. 2.1 kg-m (15 lb-ft) at 10,500 rpm (depending on market regulations) Performance Redline: 12,000 rpm (approx.) Top Speed: Approx. 150 km/h (93 mph) (rider dependent) Fuel System Carburetor: Dell'Orto PHBH 28 (or similar, often specified in manual). Fuel Type: Unleaded gasoline, minimum 95 RON (octane). Fuel Capacity: 7.3 Liters (1.9 US gal) Oil Mixture: Two-stroke oil injection system. Pre-mix not recommended. 🔧 Transmission Standard Transmission Type: 6-speed constant mesh manual. Features Clutch Type: Wet multi-plate. Final Drive: Chain drive. 📐 Dimensions Exterior Length: Approx. 1945 mm (76.6 in) Width: Approx. 720 mm (28.3 in) (at handlebars) Height: Approx. 1150 mm (45.3 in) (at windscreen) Wheelbase: Approx. 1340 mm (52.8 in) Weights Dry Weight: Approx. 130 kg (286.6 lbs) Wet Weight: Approx. 144 kg (317.5 lbs) 🛡️ Safety Features Ratings Safety Features: Standard safety features for a motorcycle of this era, including effective braking system, lighting, and rider protection through fairings. Active Features Braking System: Front: 260mm disc brake with dual-piston caliper. Rear: 220mm disc brake with single-piston caliper. Lighting: Headlight, taillight, brake lights, turn signals. 💡 Technology Features Infotainment Instrumentation: Analog tachometer, speedometer, odometer, trip meter, coolant temperature warning light, neutral indicator. Driver Assistance Assistance Systems: None (typical for a 1998 125cc sportbike). Connectivity Connectivity Features: None. 🔧 Maintenance Service Intervals Oil Change: Refer to manual for specific intervals, typically based on mileage or operating hours for the gearbox oil. Engine oil is part of the 2-stroke injection system. Air Filter Cleaning: Recommended every 3,000-5,000 km (1,800-3,000 miles), or as indicated by performance drop. Spark Plug Inspection: Recommended every 3,000-5,000 km (1,800-3,000 miles). Chain Lubrication: Recommended every 500-1,000 km (300-600 miles) and after riding in wet conditions. Fluid Specifications Engine Oil: API TC-W3 certified two-stroke oil for the injection system. Specific Aprilia recommendations should be followed. Gearbox Oil: SAE 10W-40 API GL-4 transmission oil. Capacity: 0.8 Liters (0.85 US qt). Coolant: Ethylene glycol-based coolant, typically a 50/50 mix with distilled water. Capacity: 1.1 Liters (1.16 US qt). Brake Fluid: DOT 4 hydraulic brake fluid. Known Issues Common Wear Items: Clutch plates, piston rings, exhaust valve (power valve) carbon buildup, chain and sprockets. Two Stroke Considerations: Requires specific two-stroke oil for the injection system; incorrect oil can cause engine damage. Proper jetting and exhaust valve maintenance are critical for performance and longevity. 📚 Vehicle History Brand Heritage Aprilia History: Aprilia is...