Segment:
Lightweight scooter, urban mobility, entry-level transportation.
Competitors:
Honda Dio, Suzuki Address, Kymco Agility, Aprilia Scarabeo (in its class).
Design:
Compact, agile, easy to handle, distinctive JOG styling.
Performance:
Fuel-efficient, suitable for city commuting and light recreational use.
Users:
New riders, urban commuters, owners seeking to perform their own maintenance.
Engine:
Complete engine disassembly, assembly, inspection, and repair procedures for the 50cc 2-stroke engine.
Fuel System:
Carburetor adjustment, cleaning, and rebuilding; fuel pump operation; fuel tank and lines.
Cooling System:
Air cooling system components and maintenance.
Ignition System:
CDI ignition system, spark plug specifications, testing, and replacement.
Transmission:
Automatic CVT (Continuously Variable Transmission) clutch, drive face, driven face, torque cam, and belt inspection and replacement.
Brakes:
Front and rear brake system maintenance, adjustment, pad replacement, and fluid bleeding (if applicable).
Suspension:
Front fork inspection, seal replacement, and rear shock absorber maintenance.
Electrical System:
Wiring diagrams, lighting system, starter system, battery specifications, charging system diagnosis.
Frame And Bodywork:
Chassis inspection, body panel removal and installation, seat, handlebars, and controls.
Wheels And Tires:
Tire pressure specifications, wheel removal and installation, bearing maintenance.
Routine Maintenance:
Oil changes, air filter cleaning/replacement, spark plug checks, belt inspection, brake adjustments.
Troubleshooting:
Step-by-step diagnostic procedures for common starting, running, and electrical issues.
Engine Repair:
Piston and ring replacement, cylinder head service, crankshaft and bearing service.
Transmission Repair:
CVT unit overhaul, clutch shoe replacement, roller weight service.
Electrical Diagnostics:
Testing of ignition coil, stator, regulator/rectifier, and lighting circuits.
Suspension Repair:
Front fork oil replacement and seal installation.
Brake Service:
Brake pad replacement, caliper service, and hydraulic system maintenance.
Depth:
Detailed repair procedures, torque specifications, clearances, diagnostic charts, and exploded views.
Engine Type:
50cc, 2-stroke, air-cooled, single-cylinder
Bore X Stroke:
Approx. 39.0 mm x 43.0 mm
Compression Ratio:
Approx. 7.1:1
Carburetor Model:
Mikuni VM14 (or similar 14mm flat slide)
Spark Plug Type:
NGK BR7HS (or equivalent)
Horsepower:
Approx. 4.5 - 5.0 PS @ 6500-7000 RPM
Torque:
Approx. 4.5 - 5.0 Nm @ 6000-6500 RPM
Fuel Type:
Unleaded gasoline (minimum 87 octane recommended)
Fuel Mixture:
Pre-mix or separate oil injection system (check specific model variant).
Engine Oil Type:
2-stroke scooter oil (API TC, JASO FB or FD)
Type:
Automatic, V-belt type continuously variable transmission (CVT)
Drive System:
Centrifugal clutch, V-belt, planetary gear reduction (final drive).
Gear Ratios:
Variable, optimized by CVT unit.
Transmission Oil Type:
Gear oil (e.g., SAE 80 or SAE 90 for final drive, consult manual for exact specification)
Crash Test Results:
N/A (Scooters of this era typically did not undergo standardized crash testing like automobiles).
Braking System:
Front: Drum or Disc Brake (depending on sub-model/market), Rear: Drum Brake.
Lighting:
Headlight, taillight, brake light, turn signals.
Oil Change:
Every 3,000 - 5,000 km or 6-12 months (for 4-stroke, but this is a 2-stroke. For 2-stroke, check gearbox oil and premix/injection oil levels regularly).
Air Filter Cleaning:
Every 2,000 - 3,000 km or as needed based on riding conditions.
Spark Plug Replacement:
Every 5,000 - 10,000 km, or inspect at 2,000 km.
Cvt Belt Inspection:
Every 5,000 km, replace every 10,000-15,000 km or when wear is evident.
Gearbox Oil Type:
Yamalube Gear Oil (or equivalent SAE 80/90 GL-4)
Gearbox Oil Capacity:
Approx. 0.1 Liters (refer to manual for exact capacity)
Brake Fluid Type:
DOT 3 or DOT 4 (if equipped with disc brakes)
Common Problems:
Carburetor clogging due to infrequent use, worn CVT belt and rollers, aging electrical connections, weak starter motor clutch on some models.
Preventative Maintenance:
Regular use, fuel stabilizer for storage, periodic carburetor cleaning, and checking of electrical connections are crucial.
Yamaha Legacy:
Yamaha Motor Company, founded in 1955, has a rich history in motorcycles, scooters, and performance engines, known for innovation and reliability.
Jog Lineage:
The JOG line is one of Yamaha's longest-running and most popular scooter series, originating in the early 1980s, known for its compact size and user-friendliness.
Manufacturing Locations:
Primarily manufactured in Japan and other Yamaha global production facilities.
Key Changes 2002:
Minor aesthetic updates or refinements likely occurred for the 2002 model year, building on the established CS50 platform.
