Product Name:
Yamaha MA50 1979-1992 Workshop Repair Service Manual PDF Download
Chassis Code Series:
Likely SA01/SA02 series based on era, specific code not provided in product info
Engine Code Series:
Likely A351E or similar air-cooled 2-stroke designation, specific code not provided in product info
Market Segment:
Scooter/Moped, entry-level personal transportation
Key Competitors:
Honda Dio, Suzuki Address, Tomos models, Vespa models of the era
Vehicle Type:
Lightweight scooter, primarily for urban commuting
Target Demographic:
Commuters, students, individuals seeking economical and easy-to-operate transportation
Covered Years:
1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992
Manual Type:
Workshop Service Manual / Repair Manual
Language:
Likely English (standard for Yamaha workshop manuals of this era and region of sale)
Engine Systems:
Engine disassembly, assembly, tuning, carburetor overhaul, ignition system, cooling system (air-cooled), lubrication, exhaust system
Transmission Drivetrain Systems:
Gearbox operation, clutch assembly, drive chain, final drive maintenance
Chassis Suspension Steering:
Front fork suspension, rear shock absorber(s), steering column, wheel bearings, chassis components
Brakes Systems:
Front and rear brake systems (likely drum brakes for this model/era), brake cable adjustment, brake shoe replacement
Electrical Systems:
Lighting circuits, ignition coil, CDI unit, battery maintenance, wiring diagrams, horn, indicators
Bodywork Fittings:
Body panel removal and installation, seat, fuel tank, fenders, reflectors
Maintenance Procedures:
Routine maintenance checks, lubrication points, air filter cleaning/replacement, spark plug service, brake adjustment, chain lubrication and adjustment
Diagnostic Procedures:
Troubleshooting common problems, identifying causes of poor performance, electrical fault finding
Repair Procedures:
Engine rebuilding, carburetor tuning and repair, suspension component replacement, electrical component repair, brake system servicing
Disassembly Assembly:
Step-by-step instructions for disassembling and reassembling major components
Technical Depth:
Comprehensive, covering everything from basic maintenance to full engine rebuilds and electrical system diagnostics
Target Audience:
Professional mechanics and experienced DIY enthusiasts
Engine Type:
Air-cooled, 2-stroke, single-cylinder
Displacement:
Approximately 49cc (common for 50cc class scooters)
Bore X Stroke:
Specific dimensions not provided, but typical for 50cc 2-stroke moped engines
Power Output:
Estimated 3-5 HP, specific figures vary by year and tune
Torque Output:
Low torque, focused on acceleration from standstill
Fuel Delivery:
Carburetor (e.g., Mikuni VM series or similar)
Fuel Type:
Unleaded gasoline mixed with 2-stroke oil (pre-mix or oil injection system depending on specific variant)
Oil Type:
Yamaha recommends specific 2-stroke engine oil, or equivalent JASO FD/FC rated oil
Ignition Type:
CDI (Capacitor Discharge Ignition)
Cooling Method:
Air-cooled
Length:
Specific dimensions not provided, but typically around 1600-1800 mm for 50cc scooters
Width:
Specific dimensions not provided, but typically around 650-750 mm
Height:
Specific dimensions not provided, but typically around 1000-1100 mm
Dry Weight:
Likely in the range of 60-80 kg
Gross Vehicle Weight Rating:
Not specified, but designed for single rider plus minimal cargo
Fuel Tank Capacity:
Typically around 4-6 liters
Seat Height:
Low for ease of use, accessible for most riders
Crash Safety Ratings:
Not applicable for this class/era of vehicle in modern terms
Lighting:
Headlight, taillight, brake light, turn signals (indicators)
Frame Construction:
Steel frame construction, designed for lightweight maneuverability
Oil Change Frequency:
2-stroke: Check oil level regularly, replenish as needed. Gearbox oil change: Per manual, typically every 5,000-10,000 km.
Spark Plug Replacement:
Per manual, typically every 3,000-6,000 km, depending on plug type.
Air Filter Cleaning:
Inspect every 1,000-2,000 km, clean or replace as needed. Service interval varies greatly with operating conditions.
Drive Belt Inspection:
Inspect periodically for wear and tension, replace as per manual recommendations (e.g., 10,000-15,000 km).
Transmission Oil Type:
Yamaha recommends specific gear oil, likely API GL-4 or GL-5, viscosity SAE 80W-90 or similar.
Brake Fluid Type:
If hydraulic brakes are present (unlikely for base MA50, but possible for some variants), DOT 3 or DOT 4.
Coolant Type:
N/A (Air-cooled engine)
Common Issues:
Carburetor clogging due to infrequent use, worn drive belt, weak ignition spark, general wear and tear on suspension components, exhaust system leaks.
Maintenance Priority:
Proper fuel-oil mix, regular cleaning of air filter and carburetor, and chain maintenance are critical for 2-stroke engine longevity.
Yamaha Motor Corporation:
Founded in 1955, Yamaha is a renowned global manufacturer of motorcycles, marine products, musical instruments, and more. Known for innovation and performance across its product lines.
Ma50 Lineage:
The MA50 was part of Yamaha's entry into the popular 50cc scooter market, offering a stylish and economical urban transport solution. Successors likely included models with updated styling and minor mechanical revisions within the 50cc segment.
Production Period:
1979-1992, indicating a long and successful production run for this model
Manufacturing Location:
Likely Japan or Southeast Asia, common Yamaha production bases
