🏷️ Basic Information

Make:

Yamaha (MBK)

Model:

CS50/Z Jog

Year:

2002

Model Code:

Likely CS50Z (specific model code may vary by region/market)

👋 Introduction

Market Position:

The Yamaha MBK CS50/Z Jog is a popular entry-level, lightweight scooter, often favored for urban commuting, student use, and recreational riding due to its nimble handling, fuel efficiency, and ease of use. MBK is a subsidiary of Yamaha, sharing many components and design philosophies.

Competitive Analysis:

Competes with other 50cc scooters from brands like Honda (Dio, Tact), Suzuki (Address), Kymco, and Sym during its production era. Key differentiators are often reliability, performance for its class, and Yamaha's engineering reputation.

Key Features:

Compact and lightweight design, reliable two-stroke engine, automatic transmission (CVT), practical storage, and agile maneuverability ideal for city navigation.

Target Audience:

Owners looking to perform routine maintenance and minor repairs, professional motorcycle/scooter technicians, and enthusiasts with mechanical aptitude.

📋 Manual Details

Coverage Areas:

Comprehensive service and repair procedures for the 2002 Yamaha MBK CS50/Z Jog scooter.

Page Count:

Estimated 150-250 pages (typical for this type of manual, exact count not provided in product info)

Manual Type:

Service and Repair Manual

Language:

English (presumed, standard for international sales)

Format:

Digital (PDF) / Printed (Product information implies a sales item, format needs confirmation)

📖 Manual Coverage

Systems Covered:

Engine internal components, cooling system, fuel system (carburetor, fuel tank), ignition system, exhaust system, transmission (CVT), drive system, chassis, suspension (front fork, rear shock), brakes (front disc, rear drum), electrical system (wiring diagrams, lighting, battery, starter), steering, bodywork and trim, troubleshooting, routine maintenance.

Procedures Included:

Engine disassembly and assembly, carburetor overhaul and adjustment, valve clearance adjustment, transmission belt inspection and replacement, suspension fork seal replacement, brake pad and fluid replacement, electrical component testing and replacement, chassis lubrication, troubleshooting diagnostic trees, general maintenance procedures.

Technical Depth:

Detailed workshop-level procedures, including torque specifications, special tool requirements, diagnostic fault codes (if applicable), and component overhaul instructions suitable for experienced mechanics and advanced DIY enthusiasts.

Troubleshooting Coverage:

Extensive troubleshooting section covering common starting issues, poor running conditions, electrical faults, braking problems, and transmission quirks, with diagnostic flowcharts and symptom-based solutions.

Specifications Included:

All essential technical specifications for engine, transmission, chassis, electrical system, including torque values, clearances, and tolerances.

Diagrams Illustrations:

Detailed exploded diagrams for all major assemblies, clear step-by-step repair illustrations, and comprehensive wiring diagrams.

Emissions Control Systems:

Covers emissions control components and adjustments as per regulations for the model year.

Bodywork Trim Procedures:

Instructions for removal, installation, and replacement of body panels, fairings, seat, and related trim components.

📊 Manual Specifications

File Format:

PDF (for digital version), Print (for physical version). High-resolution scans or professionally typeset content.

Print Quality:

Professional print quality with clear diagrams and legible text for printed versions. Optimized for digital viewing with searchable text and bookmarking for PDF.

Binding Type:

Coil-bound or perfect-bound for printed versions to allow for flat lay and durability in workshop environments.

Paper Type:

Durable, coated paper stock for printed versions to resist oil and grease stains in a workshop setting.

Searchability:

PDF versions should have OCR (Optical Character Recognition) for text searchability, allowing quick location of specific procedures or parts.

⚙️ Engine Specifications

Primary Engine:

50cc, air-cooled, 2-stroke, single-cylinder engine (likely Minarelli-based, a common Yamaha/MBK supplier).

Horsepower:

Approximately 5-7 hp (typical for a 50cc 2-stroke scooter of this era, exact figure subject to specific tuning and regulations).

Torque:

Low to mid-range torque focused for acceleration from a standstill, precise figures typically found in the manual.

Fuel System:

Carburetor-fed. Typically a Mikuni or Keihin carburetor, size around 12-17.5mm. Requires proper fuel-oil mixture for 2-stroke lubrication (autolube system).

Bore Stroke:

Typically around 40mm x 39.2mm (for a 50cc 2-stroke, exact dimensions in manual).

Compression Ratio:

Approx. 7.0:1 to 8.0:1 (typical for 2-stroke engines of this class).

Cooling System:

Forced air cooling via a fan shroud and cooling fins.

Ignition System:

CDI (Capacitor Discharge Ignition) system.

Carburetor Model:

Likely Mikuni VM12 or similar, specific model number detailed in the manual.

🔧 Transmission

Transmission Type:

Automatic Continuously Variable Transmission (CVT) with dry centrifugal clutch.

Optional Transmission:

None (CVT is standard for this model).

Drive Type:

Belt drive to the rear wheel via the CVT and final drive gearbox.

Gear Ratios:

Continuously variable, detailed ratios for specific speed points are typically provided in the service manual for diagnostic purposes.

📐 Dimensions

Length:

Approx. 1700-1800 mm (typical for a 50cc scooter).

Width:

Approx. 650-700 mm.

Height:

Approx. 1050-1100 mm.

Dry Weight:

Approx. 75-85 kg (typical for this class).

Gross Vehicle Weight Rating:

Typically around 230-250 kg (GVWR).

Curb Weight:

Includes all necessary operating consumables, approximately 80-90 kg.

Underseat Storage:

Standard feature, capable of storing a full-face helmet (depending on helmet size).

Wheelbase:

Approx. 1250-1300 mm.

Front Tire Size:

Typically 120/90-10 or similar.

Rear Tire Size:

Typically 130/90-10 or similar.

🛡️ Safety Features

Crash Test Ratings:

Not applicable for scooters in the same manner as automobiles. Safety is primarily addressed through design and braking systems.

Active Features:

Front disc brake for improved stopping power, rear drum brake for reliable braking. Wide handlebars for stable control.

Passive Features:

Integrated bodywork for rider protection from elements and minor impacts. Headlight, taillight, and turn signals for visibility.

Headlight Type:

Halogen bulb (e.g., 12V 35/35W P15D-25-1).

Taillight Type:

Incandescent bulb (e.g., 12V 21/5W).

💡 Technology Features

Infotainment System:

Basic analog instrument cluster including speedometer, odometer, fuel gauge (if applicable), and indicator lights for turn signals, high beam, etc. No advanced infotainment features.

Driver Assistance Features:

No electronic driver assistance systems. Focus is on mechanical reliability and rider control.

Connectivity Features:

None.

🔧 Maintenance

Oil Change Interval:

Engine oil: Every 3,000-5,000 km or annually. Gear oil: Every 6,000-10,000 km or bi-annually. 2-stroke oil reservoir: Top-up as needed, check level weekly.

Spark Plug Replacement:

Every 5,000-8,000 km or as needed based on inspection.

Air Filter Cleaning Replacement:

Clean every 3,000 km, replace every 6,000-10,000 km or as condition dictates.

Drive Belt Inspection Replacement:

Inspect belt wear and condition every 6,000 km, replace typically around 15,000-20,000 km depending on usage.

Engine Oil Type:

API SE, SF, SG, SH or SJ grade 2-stroke scooter oil (fully synthetic recommended for best performance and longevity). Autolube system uses dedicated 2-stroke oil.

Gear Oil Type:

Yamaha recommended gear oil or equivalent SAE 80W/90 hypoid gear oil.

Brake Fluid Type:

DOT 3 or DOT 4 hydraulic brake fluid.

Known Issues:

Common issues can include carburetor clogging due to infrequent use or poor fuel quality, worn drive belt, weak battery, seized piston rings (due to improper lubrication or overheating), and worn suspension bushings. Exhaust system carbon buildup can also affect performance.

Typical Repairs:

Carburetor cleaning/rebuild, drive belt and roller replacement, spark plug replacement, air filter cleaning/replacement, brake pad replacement, and occasional top-end engine rebuild (piston/rings) for high-mileage units.

Gear Oil Capacity:

Approx. 0.08 - 0.10 liters (check manual for precise amount).

Coolant Capacity:

Not applicable (air-cooled).

Fuel Tank Capacity:

Approx. 5.0 - 6.0 liters.

2 Stroke Oil Tank Capacity:

Approx. 1.0 - 1.5 liters.

Recommended Tire Pressure Front:

Typically 22-25 PSI (1.5-1.7 bar) when cold.

Recommended Tire Pressure Rear:

Typically 25-28 PSI (1.7-2.0 bar) when cold.

📚 Vehicle History

Brand Heritage:

Yamaha has a long history of producing high-quality motorcycles and scooters since its inception. MBK (Motobecane-Krasan) has French origins and became a part of the Yamaha Motor Company, contributing its expertise in smaller displacement vehicles.

Model Evolution:

The Jog line has been in production for decades, with continuous updates to styling, engine technology (from air-cooled to liquid-cooled in later models), and features. The 2002 model represents a refinement of this established platform.

Production Locations:

Likely manufactured in Europe (France for MBK) or Asia, reflecting Yamaha's global production network.

Model Line Start Year:

The Jog line originated in the late 1980s.