Aprilia SR 50 / SR 50 SP / SR 50 R Scooter Service Manual (P/N 8140212)
Aprilia Models Covered & Key Technical Specifications
Models: Aprilia SR 50, Aprilia SR 50 SP, Aprilia SR 50 R
Sub-models / Variants: Liquid-cooled, Catalytic, Drum brake
Model Years: 1997–1999
Technical Data:
- Engine: Minarelli 2-stroke, horizontal single-cylinder
- Displacement: 49.26 cc
- Bore x Stroke: 40 mm x 39.2 mm
- Compression Ratio: 12.5 ± 0.5:1
- Transmission: Automatic stepless variator
- Cooling: Forced air or liquid-cooled
- Fuel Tank Capacity: 8 liters (including 2-liter reserve)
- Spark Plug: NGK BR7 HS or NGK BR8 HS
- Front Suspension: Hydraulically operated telescopic fork (90 mm stroke)
- Rear Suspension: Hydraulic mono-shock absorber (75 mm stroke)
- Front Brake: 190 mm hydraulic disc
- Rear Brake: 110 mm mechanical drum or 190 mm hydraulic disc
- Tire Size: 130/60 - 13" 53J
- Idle RPM: 1800 ± 100 rpm
Aprilia Manual Features & Content Preview
- Covers 1997–1999 Aprilia SR 50, SR 50 SP, and SR 50 R scooters equipped with Minarelli 2-stroke engine variants
- Original OEM publication part # 8140212, second edition released in June 1999
- Contains 193 pages of maintenance data, including 15 pages of technical specifications, chassis diagrams, and complete electrical schematics
- Provides official Aprilia service documentation required for factory-level maintenance, featuring expanded coverage for liquid-cooled and catalytic configurations over base models
Service and Maintenance Documentation
Getting accurate baseline numbers is critical when diagnosing a high-revving 2-stroke. This manual provides the structured chassis, engine, and electrical data you need for the SR 50 lineup. It outlines general shop safety rules, detailed service intervals, and exact system component layouts. You will find complete breakdowns of the fuel delivery and cooling systems. The documentation also covers braking system service for both drum and disc configurations. If you are tracking down a stubborn running issue, the comprehensive troubleshooting charts target engine starting problems and specific performance concerns directly.
Technical Data and Specifications
Rebuilding the Minarelli powerplant requires precise measurements. This publication delivers detailed specification tables covering bore, stroke, and compression ratios. Standard torque values for ISO metric threads, along with model-specific fastener torque settings, are thoroughly documented in both Nm and kgm to ensure safe, consistent assembly. Proper fluid levels are clearly outlined, with coolant capacities listed at 1.2 liters for liquid-cooled units and transmission oil set at 110 cm³. You also get crucial reference data like tire inflation pressures for solo or passenger riding, spark plug gaps of 0.5–0.6 mm, and electrical fuse ratings of 7.5 A. Keep in mind that working on high-pressure systems and electrical components carries inherent risks, so always cross-reference the original OEM specifications to ensure correct procedures before turning a wrench.
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