Market Position:
The Aprilia RS50 was positioned as a premium, high-performance 50cc sportbike, targeting younger riders and enthusiasts with its race-inspired styling, advanced chassis, and potent two-stroke engine for its class. It aimed to provide a gateway into the world of sportbike riding.
Competitive Analysis:
Competed directly with other European 50cc sportbikes such as the Yamaha TZR50, MBK X-Power, Derbi GPR50, and Honda NSR50. The RS50 was often lauded for its superior handling, braking, and authentic supersport aesthetics compared to many competitors.
Key Features:
Aggressive styling mirroring larger Aprilia RSV Mille/Falco models, advanced aluminum twin-spar frame, high-performance liquid-cooled 2-stroke engine (often Rotax 140 or similar), capable suspension, powerful disc brakes, and a lightweight chassis.
Systems Covered:
Engine, Fuel System, Ignition System, Cooling System, Exhaust System, Transmission, Clutch, Drive Train, Suspension (Front & Rear), Braking System (Front & Rear), Wheels & Tires, Electrical System, Chassis, Frame, Bodywork, Controls, Tools & Equipment
Procedures Included:
Routine Maintenance, Scheduled Servicing, Troubleshooting, Diagnostics, Component Removal & Installation, Engine Rebuilding, Carburetor Tuning, Electrical System Repair, Brake Bleeding & Servicing, Suspension Adjustment & Overhaul, Frame Inspection & Repair, Bodywork Repair & Adjustment, Torque Specifications, Wiring Diagrams, Special Tools Usage
Technical Depth:
Comprehensive. Covers everything from basic checks and fluid changes to full engine teardown and rebuild, electrical diagnostics, and chassis repairs. Suitable for experienced DIY mechanics and professional technicians.
Primary Engine:
Liquid-cooled, 2-stroke, single-cylinder
Engine Details:
Typically features a reed valve induction, possibly with a power valve (A.E.S. - Aprilia Exhaust System) for improved torque and power delivery across the rev range. Displacement is 49.3 cc.
Horsepower:
Approx. 6.4 hp (4.7 kW) @ 8000 rpm (typically restricted for legal 50cc classes, de-restricted potential higher)
Torque:
Approx. 5.0 Nm (3.7 lb-ft) @ 7500 rpm (estimated)
Fuel System:
Carbureted. Typically uses a Dell'Orto PHVA 17.5 or similar 17.5mm carburetor.
Ignition System:
Electronic CDI (Capacitor Discharge Ignition)
Cooling System:
Liquid-cooled, with a front-mounted radiator and fan.
Lubrication System:
Premix (fuel/oil mixture) or separate oil injection system.
Bore X Stroke:
Approx. 39.5 mm x 40.0 mm
Compression Ratio:
Approx. 8.5:1 (typical for this class, varies with de-restriction)
Length:
Approx. 1940 mm (76.4 in)
Width:
Approx. 710 mm (28.0 in) at handlebars
Height:
Approx. 1040 mm (40.9 in) at seat
Wheelbase:
Approx. 1360 mm (53.5 in)
Seat Height:
Approx. 810 mm (31.9 in)
Dry Weight:
Approx. 115 kg (253.5 lbs)
Fuel Tank Capacity:
Approx. 13 liters (3.4 US gal)
Oil Tank Capacity:
Approx. 1.5 liters (0.4 US gal) for separate injection systems
Coolant Capacity:
Approx. 0.8 liters (0.2 US gal)
Safety Ratings:
As a 50cc sportbike primarily for younger riders, formal crash test ratings like NCAP are not typically applicable. Safety relies on rider skill and adherence to traffic laws.
Active Features:
Powerful front and rear disc brakes, capable suspension geometry for stability, responsive steering.
Passive Features:
Frame integrity, rider protective gear is paramount.
Front Brake:
Single disc, hydraulic caliper (e.g., 280mm disc, 2-piston caliper)
Rear Brake:
Single disc, hydraulic caliper (e.g., 220mm disc, 1-piston caliper)
Front Tire Size:
110/70-17
Rear Tire Size:
130/70-17
Wheel Type:
Cast aluminum alloy, 17-inch diameter
Infotainment System:
N/A - This is a basic sportbike focused on performance and riding experience; no complex infotainment systems.
Instrumentation:
Analog speedometer and tachometer, odometer, trip meter, coolant temperature warning light, neutral indicator, turn signal indicators, high beam indicator.
Service Intervals:
Detailed schedules provided in the manual, typically including: Oil change/check (every few hundred km or monthly), Spark plug replacement (e.g., 3000-5000 km), Air filter cleaning/replacement (e.g., 3000-6000 km), Chain cleaning & lubrication (frequent, e.g., every 500 km), Brake fluid flush (e.g., annually), Coolant flush (e.g., every 2 years), Full engine service (e.g., 6000-10000 km). Specific intervals are critical and are detailed in the manual.
Engine Oil Type:
2-stroke engine oil (specific API TC, JASO FD or higher specification, often recommended as semi-synthetic or fully synthetic for performance). The manual will specify the exact grade and standard. If separate oil injection, Aprilia brand or equivalent 2T oil is recommended.
Coolant Type:
Ethylene glycol based antifreeze coolant (e.g., 50/50 mix with distilled water). Manual will specify color and type.
Brake Fluid Type:
DOT 4 brake fluid.
Gearbox Oil Type:
Specific 2-stroke gearbox oil (e.g., SAE 75W/80 or 80W/90 GL-4). Capacity approx. 0.6 - 0.8 liters.
Common Issues:
Carburetor tuning sensitivity, exhaust port clogging (especially with aggressive premix or short-distance use), potential for stator/ignition coil failure, wear on the power valve mechanism (if equipped), rear shock absorber degradation over time, and general wear and tear on suspension components and bearings due to the bike's sporty nature.
Spark Plug Recommendation:
NGK BR9EG or similar, with specific gap (e.g., 0.7-0.8 mm) detailed in manual.
Air Filter Type:
Foam or paper element, depending on original specification.
Brand Heritage:
Aprilia, an Italian manufacturer, has a rich history in motorcycle racing, particularly in smaller displacement classes like 125cc and 250cc Grand Prix, as well as success in Supermoto and World Superbike. This racing pedigree heavily influenced the design and engineering of their road-going sportbikes, including the RS50.
Model Evolution:
The RS50 model line evolved through several iterations. The 1999-2005 period covers a significant generation that refined the original design, often featuring updated styling and minor mechanical improvements. Later models saw changes in engine specifications (e.g., more advanced engine management or emission controls depending on market) and aesthetics. The manual covers a specific, well-regarded era of this model's development.
Production Years:
1999-2005 for this specific manual coverage. The RS50 model line itself has had a longer production run, with significant redesigns in later years.
Manufacturing Location:
Italy
Recognitions:
While specific awards for the 1999-2005 RS50 generation are not widely publicized, the model was consistently praised in enthusiast and motorcycle media of its time for its class-leading handling, braking, and premium feel, often being considered the benchmark 50cc sportbike.
Enthusiast Ratings:
Highly regarded by owners and reviewers for its authentic supersport experience and build quality, making it a desirable machine for young riders and collectors.
