Official Service Manual for Aprilia SR 50, SR 50 SP, SR 50 R (50cc) (1997–1999) (163 P.) | Ready to Print
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Sample pages from the Official Service Manual for Aprilia SR 50, SR 50 SP, SR 50 R (50cc) (1997–1999) (163 P.) | Ready to Print manual
Purchase Information
Technical Specifications
- Document Number / Seller:
- 31831 / David Cooper
- File Size:
- 8.57 MB
- File Type:
- Language:
- English, Italian, Spanish
- Pages:
- 193
- Printable:
- Yes
- Estimated Download Time:
- 0.18 Minutes
- Delivery Format:
- Digital (PDF) - Instant Access
- Category:
- Scooter
- Brand:
- Aprilia
- Reviewed and Approved:
- Jan 12, 2026
Aprilia Models and Parts Covered in this Scooter Manual
- Aprilia SR 50 50cc Series (1997–1999) | Series: 8140212
- Full Coverage: Aprilia SR 50, Aprilia SR 50 SP, Aprilia SR 50 R
Aprilia Ignition Architectures specify a spark advance of 14° ± 2° BTDC for precision timing across all SR 50 variants. Aprilia Carburetion Parameters utilize Dell'Orto PHBN 12 or TEI KEI TK3AA framework for fuel delivery logic. Aprilia Torque Logic identifies 110 Nm (11 kgm) for the rear wheel nut and 50 Nm (5 kgm) for the front wheel pin nut. Aprilia Cooling Framework outlines thermistor resistance values of 226 ± 50 Ohms at 50°C using a pocket tester (ohmmeter). Aprilia Maintenance Parameters mandate SAE 75W–90 transmission oil and GREEN HIT 2-stroke oil to preserve engine logic.
Complete Manual Information
Aprilia SR 50 (50cc) Service and Repair Manual
Technical Applicability & Serial Ranges
- Aprilia SR 50 (50cc) (1997–1999): Ignition advance logic of 14° ± 2° BTDC.
- Aprilia SR 50 SP (50cc) (1997–1999): Dell'Orto PHBN 12 carburetion framework.
- Aprilia SR 50 R (50cc) (1997–1999): 110 Nm rear wheel torque specifications.
- Aprilia SR 50 Liquid Cooled (50cc) (1997–1999): 226 ± 50 Ohms thermistor architectures.
- Aprilia SR 50 Air Cooled (50cc) (1997–1999): Spark plug gap logic 0.5–0.6 mm.
Engineering Intelligence & Logic
| Aprilia SR 50 (50cc) Calibration Matrix | Component | Specification |
|---|---|---|
| Ignition Timing | 14° ± 2° BTDC | |
| Idle Engine Speed | 1800 ± 100 rpm | |
| Rear Wheel Nut Torque | 110 Nm | |
| Front Wheel Pin Torque | 50 Nm | |
| Thermistor Resistance @ 50°C | 226 ± 50 Ω | |
| Spark Plug Electrode Gap | 0.5–0.6 mm |
Aprilia SR 50 (50cc) Revision 8140212 mandates a specialized maintenance framework where the synchronization of the capacitive discharge ignition requires a precise advance of 14° ± 2° before top dead center at an idle speed of 1800 ± 100 rpm to ensure optimal combustion logic within the vertical or horizontal engine architectures. Precision is paramount.
Scooter technicians must utilize a Pocket Tester configured as an ohmmeter to verify the thermal resistance parameters of the coolant sensor, which should indicate approximately 226 ± 50 Ohms when the liquid reaches a stabilized temperature of 50°C. Accurate calibration is achieved.
Aprilia hardware integrity is further secured by applying exactly 110 Nm of force to the rear wheel nut, preventing axle oscillations and ensuring the mechanical framework remains within factory tolerances during high-vibration operation. Failure to adhere to these torque specifications can compromise the structural logic of the drivetrain. Precise torque saves components.
FAQ
Relationship between Aprilia Part # 8140212 and other Aprilia SR 50 (50cc) service volumes? Aprilia Part # 8140212 provides primary vehicle procedures, but for internal engine overhauls or specific component architectures, technicians must consult the Engine Service and Repair Manual # 921 to ensure a complete maintenance framework.
Diagnostic tool and pressure point logic for Aprilia SR 50 (50cc)? Pocket Tester set as an ohmmeter is required to verify the thermistor resistance parameters, which must indicate approximately 226 ± 50 Ohms when the coolant temperature reaches a stabilized logic of 50°C.
Engine and drivetrain repair coverage for Aprilia SR 50 (50cc)? 110 Nm is the mandatory torque specification for the rear wheel nut logic to ensure drivetrain stability.
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Frequently Asked Questions - Aprilia Scooter Manual
Is this manual suitable for beginners?
Yes, this Aprilia manual is designed for both professional technicians and DIY enthusiasts. It includes step-by-step procedures with clear illustrations and safety guidelines for Scooter maintenance and repair.
What file format will I receive?
You will receive this manual as a PDF file (8.57 MB), which is compatible with all devices. The manual is fully searchable and printable for your convenience.
How quickly can I access the manual after purchase?
You'll receive instant access to your Aprilia Scooter manual immediately after payment completion. The download link is valid for 3 days, with lifetime re-download guarantee.
Can I print specific sections of the manual?
Absolutely! This digital manual allows you to print any section you need, from individual pages to complete chapters, making it perfect for workshop use.
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