Positioning:
High-performance 125cc sportbike, popular for track days and street use, often chosen by younger riders for its racing pedigree.
Competitors:
Yamaha YZF-R125 (later models), Honda CBR125R (later models), Cagiva Mito 125.
Unique Selling Points:
Race-derived styling, strong performance for its class, potent 2-stroke engine, sophisticated chassis and suspension.
Benefit To User:
Empowers owners to perform repairs and maintenance themselves, saving significant costs compared to professional shop labor. Provides in-depth knowledge for proper upkeep and restoration.
Primary Coverage:
Full service, repair, diagnostics, maintenance, and restoration.
Secondary Coverage:
Technical specifications, troubleshooting guides, wiring diagrams.
Estimated Pages:
Refer to specific edition for exact count; comprehensive coverage implies extensive pages.
Type:
Service Repair Manual
Delivery:
Instant Digital Download
Engine Mechanical:
General Information, Engine Removal and Installation, Cylinder Head/Valves, Crankcase/Piston/Cylinder, Crankshaft/Transmission/Balancer, Engine Combustion System.
Engine Ancillary:
Engine Fuel System, Engine Lubrication and Cooling, Lubrication System, Cooling System, Fuel Injection System.
Transmission:
Gearbox & Clutch, Transmission System.
Chassis And Suspension:
Front Wheel and Steering System, Rear Wheel System, Chassis, Suspension.
Electrical:
Alternator/Starter Clutch, Battery/Charging System, Ignition System, Electric Starter, Lights/Meters/Switches, Wiring Diagrams.
Bodywork And Exhaust:
Fenders and Exhaust Pipe, Body & Fixtures, Frame/Body Panels/Exhaust System.
Wheels And Tires:
Wheels & Tyres.
Maintenance:
Periodic checks & Adjustments, routine service, fluid changes, filter replacements.
Repair:
Engine rebuild, gearbox overhaul, suspension service, brake caliper servicing, electrical component replacement.
Diagnostics:
Troubleshooting, fault finding, diagnostic flowcharts.
Disassembly Assembly:
Engine removal/installation, component disassembly and reassembly for all covered systems.
Depth:
Comprehensive, from basic maintenance to complete engine and chassis rebuilds, including detailed electrical schematics and fuel injection system diagnostics.
Engine Type:
2-stroke, single-cylinder
Displacement:
124.8 cc (7.6 cu in)
Bore X Stroke:
54 mm x 54.5 mm (2.13 in x 2.15 in)
Cooling System:
Liquid-cooled
Ignition System:
Electronic ignition (CDI)
Horsepower:
Approx. 30-35 HP (varies by market regulations and specific model variant)
Torque:
Approx. 20-23 Nm (varies)
Carburetor:
Dell'Orto PHBH 28 (or similar)
Fuel Injection:
May feature electronic fuel injection (CAT-I) on later models within this range.
Lubrication Type:
Pre-mix or Autolube system (depending on exact model variant)
Length:
Approx. 2000 mm (78.7 in)
Width:
Approx. 700 mm (27.6 in)
Height:
Approx. 1130 mm (44.5 in)
Dry Weight:
Approx. 130-135 kg (287-298 lbs)
Fuel Capacity:
Approx. 7.8 - 9.5 Liters (2.0 - 2.5 Gallons), including reserve.
Crash Safety:
Not officially rated in the same way as cars; relies on rider skill and protective gear.
Braking System:
Front: Disc brake (e.g., Brembo calipers); Rear: Disc brake.
Suspension Features:
Upside-down (USD) front forks, Monoshock rear suspension.
Lighting:
Halogen headlights, taillights, turn signals.
Oil Change:
Refer to manual for specific interval based on usage; 2-stroke requires oil for fuel/oil mixture or autolube system.
Spark Plug Inspection:
Typically every 3,000-5,000 km (1,800-3,000 miles).
Air Filter Cleaning:
Regular inspection and cleaning/replacement as per manual, often every 5,000-10,000 km.
Chain Lubrication Adjustment:
Every 500-1000 km, or after riding in wet conditions.
Coolant:
Ethylene glycol-based coolant (e.g., Motul Motocool Expert, Castrol Radicool).
Gearbox Oil:
SAE 10W-40 API SG or higher, or specific Aprilia recommendation.
2-Stroke Oil:
High-quality synthetic 2-stroke engine oil for performance applications (e.g., Motul 710 2T, Castrol TTS).
Common Problems:
Potential for exhaust power valve issues if not maintained, carburetor jetting sensitivity to altitude/temperature, wear on the 2-stroke piston and rings at higher mileage.
Electrical Quirks:
Occasional issues with stator or rectifier on older models, wiring harness integrity.
Cooling System Maintenance:
Regular flushing and inspection of hoses due to the liquid-cooled nature of the engine.
Brand Focus:
Aprilia is renowned for its motorsport heritage, particularly in Grand Prix racing, specializing in high-performance sportbikes and scooters.
Rs125 Lineage:
The RS 125 is a long-standing model in Aprilia's lineup, evolving from earlier designs to incorporate advanced technologies and styling cues from larger Aprilia sportbikes.
Manufacturing Location:
Italy
Motorsport Success:
The RS 125 platform has a strong racing pedigree and has been a dominant force in 125cc racing classes, contributing to its desirability and performance reputation.
Performance Reviews:
Generally praised for its handling, braking, and spirited engine performance, often considered one of the best in its class for its era.
🏆 Professional Vehicle Manual Information
Comprehensive technical documentation for maintenance, repair, and operation
