1997-2006 Yamaha YQ50 Aerox 50 R Service Manual
YQ50 service documentation with complete engine diagnostics, transmission procedures, and CDI ignition tuning. Covers 2-stroke liquid-cooled engine, V-belt transmission, and dual disc brakes. Part numbers 5BS-AE2 reference.
Manual Preview
Sample pages from the 1997-2006 Yamaha YQ50 Aerox 50 R Service Manual manual
Purchase & Download
Models Covered & Key Technical Specifications
Yamaha YQ50 (Aerox 50 R) (5BS-AE2) — 1997–2006 Engineering Consolidated Portfolio | YQ50 Series File.
- Reference Consumption Data: 49 cm³ (2.99 cu in) is standardized to the engine displacement Architecture.
- Integral Electrical Load: For optimal ignition function, 7.9:1 determines the cylinder compression ratio Framework.
- General Cold Start Limits: Tank capacity is calibrated to 7.0 L (1.85 US gal) Mapping.
- Certified Form Factor: The scooter requires 97 kg (214 lb) rated at maximum basic vehicle weight Configuration.
- Factory Tightening Data: Engine idle speed reaches 1600–2000 rpm Benchmarks.
- Established Power Rating: Spark plug gap corresponds to 0.5–0.7 mm (0.020–0.028 in) Baseline.
Professional Workshop Service Manual & Technical Specifications
Commercial Electrical Manual: Yamaha YQ50 (Aerox 50 R) Service Manual
Architecture-Focus: YQ50, Aerox 50 R scooter models // Calibration-Scope: Electrical and ignition system operations documentation // Architecture-Focus: Complete diagnostic and service procedures including engine, transmission, chassis, and electrical systems.
| System Category | Coverage Details | Documentation Status |
|---|---|---|
| Engine and Transmission | Cylinder head, crankshaft, piston assemblies, V-belt transmission, clutch mechanisms | Complete specifications provided |
| Cooling and Electrical | Radiator, water pump, thermostatic control, ignition system, charging circuits | See Chapter 5 and 8 |
| Chassis and Suspension | Front fork, rear shock absorber, steering head, brake systems (front and rear disc brakes) | Complete specifications provided |
Repair procedures are structured around the engine overhaul process, beginning with cylinder head inspection and progressing through crankshaft measurements, piston ring installation, and transmission assembly. The manual documents cooling system components including radiator capacity (1.2 L total), water pump impeller specifications, and thermostatic valve operation requirements. Carburetion coverage details the DELL'ORTO PHBN 12 HS carburetor with jet configurations, float height measurements (15.0–17.0 mm), and needle valve inspection procedures.
Technical Interface
Diagnostic procedures are covered for the CDI magneto system, including pickup coil resistance (400–600 Ω at 20°C), source coil resistance (640–960 Ω at 20°C), and ignition coil specifications with minimum spark length documentation (6 mm). The electrical section encompasses starter motor assembly, battery specifications (12V 4Ah), voltage regulator operation, and complete wiring diagrams with color-coded circuit routing. This schematic interface provides comprehensive troubleshooting sequences for starting failures, charging system issues, and lighting system malfunctions.
Comprehensive Architecture
Suspension system architecture is documented for both front telescopic forks with 80 mm travel and rear unit swing suspension with 72 mm travel. The manual provides spring rate specifications (5.7 N/mm front, 28 N/mm rear) and shock absorber assembly procedures. Brake system documentation includes disc pad thickness specifications (4.5 mm standard, 2.0 mm wear limit), master cylinder bore diameter (11 mm), and caliper cylinder specifications (30 mm). Steering head assembly procedures detail ball bearing configurations with 15 pieces (4.75 mm) upper and lower, along with proper adjustment protocols.
Advanced Topology
The document includes detailed transmission component specifications covering main axle runout limits (0.08 mm), drive axle runout limits (0.08 mm), and V-belt width documentation (16.5 mm standard, 15.7 mm wear limit). Fuel system procedures document the fuel cock inspection process, reed valve clearance measurements (less than 0.2 mm), and valve stopper height specifications (6.0–6.4 mm). Oil pump assembly guides describe the Autolube system with stroke measurements (2.62 mm for F/B/P/I/E models, 2.5 mm for D/NL/CHE models) and bore specifications (0.5 mm).
Precise Interface
Ignition timing documentation specifies 14° B.T.D.C. at 5,000 r/min with detailed CDI unit assembly instructions. Battery specifications are provided with specific gravity reference (1.280 at 20°C) and charging current recommendations (0.4 amps/10 hrs). The manual documents torque specifications for engine mounting bolts, crankcase holding screws, and primary sheave assembly fasteners to ensure proper bolt stretch prevention.
Diagnostic Methodology
Troubleshooting procedures address starting failures through systematic checks of fuel systems, electrical components, and compression integrity. The guide provides inspection steps for hard starting conditions, poor idle speed performance, and high-speed operation issues. Automatic transmission diagnostics cover V-belt condition assessment, clutch shoe thickness measurements (2.0 mm standard, 1.0 mm wear limit), and secondary sheave spring free length documentation (29.9 mm nominal). Brake system troubleshooting includes procedures for bleeding hydraulic circuits, inspecting pad wear, and checking master cylinder fluid levels.
This service manual documents torque specifications for the steering head ring nut to ensure proper assembly integrity.
FAQ
Customer Reviews
Read what our customers say about this Yamaha Scooter manual and share your own experience.
Add a Review
This policy contains information about your privacy. By posting, you are declaring that you understand this policy:
- Your name, rating, website address, town, country, state and comment will be publicly displayed if entered.
- Aside from the data entered into these form fields, other stored data about your comment will include:
- Your IP address (not displayed)
- The time/date of your submission (displayed)
- Your email address will not be shared. It is collected for only two reasons:
- Administrative purposes, should a need to contact you arise.
- To inform you of new comments, should you subscribe to receive notifications.
- A cookie may be set on your computer. This is used to remember your inputs. It will expire by itself.
This policy is subject to change at any time and without notice.
These terms and conditions contain rules about posting comments. By submitting a comment, you are declaring that you agree with these rules:
- Although the administrator will attempt to moderate comments, it is impossible for every comment to have been moderated at any given time.
- You acknowledge that all comments express the views and opinions of the original author and not those of the administrator.
- You agree not to post any material which is knowingly false, obscene, hateful, threatening, harassing or invasive of a person's privacy.
- The administrator has the right to edit, move or remove any comment for any reason and without notice.
Failure to comply with these rules may result in being banned from submitting further comments.
These terms and conditions are subject to change at any time and without notice.
Reviews (2)