🏷️ Basic Information

Make:

Yamaha

Model:

JOG

Year:

1999

Product Name:

1999 Yamaha JOG Service Repair Maintenance Manual

👋 Introduction

Market Position:

The Yamaha JOG series is a long-standing and popular line of scooters, known for their reliability, ease of use, and affordability, particularly in urban commuting and entry-level rider segments. The 1999 model represents a mature iteration of this successful platform.

Competitors:

Competes with other 50cc scooters of the era, such as Honda Dio, Suzuki Address, and various European and Taiwanese manufacturers. The JOG often distinguished itself with its sporty styling and robust engine performance for its class.

Key Features:

Compact and lightweight design, agile handling, user-friendly operation, fuel-efficient two-stroke engine, reliable CVT automatic transmission, ample storage under the seat.

📋 Manual Details

Language:

English

Manual Type:

Service Repair Maintenance Manual

Applicable Models:

Yamaha JOG Scooter models from 1999 (specific chassis codes like SA16J or 5BM may be detailed within the manual depending on region)

Page Count:

Estimated 250-350 pages

Format:

Digital PDF

📖 Manual Coverage

Systems:

Engine, Transmission (CVT), Fuel System, Ignition System, Cooling System, Exhaust System, Electrical System, Chassis, Suspension, Brakes, Steering, Bodywork, Routine Maintenance

Electrical System Detail:

Includes detailed wiring diagrams, component testing procedures for ignition, lighting, charging system, and starter motor.

Procedures:

Complete disassembly and reassembly, troubleshooting diagnostics, component testing, routine maintenance procedures, lubrication schedules, fluid changes, electrical wiring diagrams, torque specifications, repair instructions

Troubleshooting Guides:

Step-by-step troubleshooting for common starting problems, electrical faults, running issues, and transmission performance problems.

Depth:

Comprehensive, covering everything from basic fluid checks and filter replacements to major engine and transmission overhauls, electrical system diagnostics, and body panel repairs.

📊 Manual Specifications

File Format:

Searchable PDF

Searchability:

Full text search capability allowing quick access to specific topics.

Print Quality:

High-resolution scans suitable for printing

Binding Type:

N/A (Digital)

Paper Type:

N/A (Digital)

⚙️ Engine Specifications

Engine Type:

Air-cooled, 2-stroke, single-cylinder

Displacement:

49cc (common for JOG variants)

Bore X Stroke:

Approx. 39.0 mm x 43.0 mm (typical for 49cc 2-stroke)

Compression Ratio:

Approx. 7.4:1 (typical for 2-stroke scooters)

Horsepower:

Approx. 4.0 - 5.0 HP @ 6500-7000 RPM (varies by specific JOG model and tuning)

Torque:

Approx. 4.0 - 4.5 Nm @ 6000-6500 RPM (varies by specific JOG model)

Fuel Delivery:

Carburetor (e.g., Mikuni VM12 or similar)

Fuel Type:

Unleaded Gasoline (87 octane minimum recommended)

Fuel Tank Capacity:

Approx. 4.0 - 5.0 Liters (varies by specific JOG model)

Oil Type:

2-stroke Engine Oil (API TC or JASO FD rated recommended)

Oil Mixing Ratio:

Yamaha recommends specific premix ratios or the use of the automatic oil injection system, typically 50:1 for premix if auto-lube is bypassed.

🔧 Transmission

Transmission Type:

Automatic (CVT - Continuously Variable Transmission)

Drive Type:

V-belt drive with centrifugal clutch

Gear Ratios:

Continuously variable, optimized by variator and clutch engagement

Transmission Fluid:

Gear oil for final drive (e.g., SAE 80 API GL-4 or GL-5)

Transmission Fluid Capacity:

Approx. 0.08 - 0.12 Liters (final drive)

📐 Dimensions

Overall Length:

Approx. 1650 - 1700 mm (varies by specific JOG model)

Overall Width:

Approx. 650 - 670 mm

Overall Height:

Approx. 1000 - 1050 mm

Wheelbase:

Approx. 1160 - 1180 mm

Dry Weight:

Approx. 70 - 80 kg (varies by specific JOG model)

Gross Vehicle Weight Rating Gvwr:

Approx. 150 - 160 kg

Seat Height:

Approx. 730 - 750 mm

🛡️ Safety Features

Crash Test Ratings:

N/A (Scooters typically not subjected to standardized crash testing like automobiles)

Braking System Front:

Drum brake or Disc brake (depending on specific JOG variant)

Braking System Rear:

Drum brake

Lighting System:

12V Halogen headlight, taillight, brake light, turn signals

Frame Type:

Underbone steel frame

Tires Front:

3.00-10 or 90/90-10 (common sizes)

Tires Rear:

3.00-10 or 90/90-10 (common sizes)

Ignition System:

CDI (Capacitor Discharge Ignition)

💡 Technology Features

Infotainment System:

N/A (Basic scooter)

🔧 Maintenance

Oil Change Recommendation:

Every 1000-2000 km or annually for transmission fluid. 2-stroke oil should be checked and topped up regularly, and the injection system serviced as per manual.

Spark Plug Replacement:

Every 4000-6000 km or as needed based on inspection.

Air Filter Cleaning Replacement:

Clean every 2000 km, replace every 4000-8000 km or as condition dictates.

Belt Check Replacement:

Inspect CVT belt every 5000 km, replace at 10,000-15,000 km or sooner if wear is evident.

Coolant Type:

N/A (Air-cooled engine)

Brake Fluid Type:

DOT 3 or DOT 4 (if equipped with disc brake front)

Common Issues:

CVT belt wear, carburetor clogging due to infrequent use, weak starter motor, aging electrical components (e.g., rectifier, stator), exhaust system corrosion.

2 Stroke Engine Care:

Proper oil mixing/injection is critical to prevent premature engine wear and seizure. Regular decarbonization of the exhaust port and piston crown is recommended.

📚 Vehicle History

Brand Heritage:

Yamaha Motor Company, founded in 1955, has a long and storied history in motorcycles, scooters, and musical instruments. Yamaha is renowned for its engineering prowess, innovation, and performance across its product lines.

Model Evolution:

The JOG (Jogging) line was introduced in the early 1980s and has undergone numerous revisions and model updates. The 1999 model is part of the '5BM' or 'SA16J' generation depending on market, often featuring updated styling, improved emissions control (for its time), and minor performance tweaks over earlier iterations.

Production Period:

The JOG line has been in continuous production for decades, with the 1999 model being a significant iteration of its popular 50cc platform.

Manufacturing Locations:

Typically manufactured in Japan, Taiwan, and other Asian countries for various global markets.

🏆 Awards & Recognition

Awards:

While specific awards for the 1999 JOG are not readily documented, the Yamaha JOG series consistently received praise for its reliability, value, and popularity in the scooter market, often being a benchmark for 50cc scooters.

Customer Satisfaction Ratings:

Generally high for the JOG line due to its durability and low running costs.

Emission Standards Compliance:

Compliant with the emissions standards of its time for the respective markets (e.g., EPA, Euro standards).