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Now Yamaha YZ125 YZ 125 2002 02 Service Repair Workshop Manual
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🏷️ Basic Information Identification Make: Yamaha Model: YZ125 Model Year: 2002 Product Name: Yamaha YZ125 YZ 125 2002 02 Service Repair Workshop Manual Codes Chassis Code: Not specified in product...
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类型: Motorcycle
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斯库: 245535
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🏷️ Basic Information
Identification
Make:
Yamaha
Model:
YZ125
Model Year:
2002
Product Name:
Yamaha YZ125 YZ 125 2002 02 Service Repair Workshop Manual
Codes
Chassis Code:
Not specified in product data, typically varies by region and minor updates
Engine Code:
Not specified in product data, refer to VIN/engine serial number on the vehicle
👋 Introduction
Market Position
Market Segment:
Motocross/Off-Road Competition
Target Audience:
Enthusiast owners, mechanics, and tuners seeking detailed repair and maintenance information.
Competitive Analysis
Competitors 2002:
Honda CR125R, Kawasaki KX125, Suzuki RM125
Key Features Vehicle
Yz125 Reputation:
Known for its nimble handling and potent two-stroke power delivery.
Key Features Manual
Manual Value Proposition:
Provides in-depth technical guidance crucial for maintaining peak performance and longevity of the YZ125.
📋 Manual Details
Coverage Areas
Primary Coverage:
Yamaha YZ125 (2002 Model Year)
Secondary Coverage:
Similar years and models (as stated in product description)
Page Count
Page Count:
Estimated 300-500 pages (typical for a comprehensive service manual)
Manual Type
Manual Type:
Service Repair Workshop Manual
Language
Language:
English (Assumed, typical for this type of manual)
Format
Format:
Digital (Likely PDF, given common sales practices for manuals)
📖 Manual Coverage
Systems Covered
Engine System:
Complete engine teardown, assembly, tuning, lubrication, cooling, and component diagnostics.
Fuel System:
Carburetor specifications, jetting, maintenance, fuel pump, fuel lines, and tank.
Ignition System:
CDI, spark plug specifications, timing, troubleshooting, and component testing.
Transmission System:
Gearbox disassembly, assembly, lubrication, clutch operation, and shift mechanism.
Suspension System:
Front fork (USD) and rear shock absorber service, oil levels, pressure adjustments, and seal replacement.
Braking System:
Front and rear hydraulic disc brake service, caliper maintenance, bleeding procedures, and pad replacement.
Electrical System:
Wiring diagrams, lighting, charging system, troubleshooting electrical faults, and component testing.
Frame And Bodywork:
Chassis inspection, seat, fenders, handlebars, footpegs, and general bodywork repairs.
Cooling System:
Radiator inspection, coolant type, fill procedures, and troubleshooting overheating.
Exhaust System:
Exhaust pipe and silencer maintenance and inspection.
Procedures Included
Routine Maintenance:
Oil changes, filter replacements, chain adjustment, air filter cleaning, spark plug inspection, and general lubrication.
Troubleshooting Diagnostics:
Step-by-step diagnostic procedures for common starting issues, performance problems, and component failures.
Engine Rebuild:
Complete engine overhaul procedures, including piston, ring, cylinder, crankshaft, and bearing replacement.
Suspension Rebuild:
Front fork seal replacement, oil changes, and rear shock absorber servicing.
Brake System Repair:
Brake pad replacement, caliper service, and brake fluid bleeding.
Carburetor Tuning:
Idle speed adjustment, mixture screw settings, and jetting recommendations for different conditions.
Electrical Troubleshooting:
Using wiring diagrams to diagnose and repair electrical faults.
Clutch Service:
Clutch lever adjustment, cable replacement, and clutch pack inspection/replacement.
Wheel And Tire Service:
Tire changes, spoke tensioning, and wheel bearing maintenance.
Technical Depth
Depth Level:
Comprehensive Workshop Level
Diagnostic Capabilities:
Advanced diagnostics for engine, electrical, and mechanical systems.
Rebuild Instructions:
Detailed instructions for complete engine and component rebuilds.
Specifications Data:
Precise torque values, clearances, fluid specifications, and electrical resistance readings.
📊 Manual Specifications
File Format
File Type:
PDF (Portable Document Format)
Searchability:
Likely text-searchable if professionally scanned and OCR'd.
Print Quality
Print Readability:
High quality, suitable for printing individual pages or the entire manual.
Binding Type
Binding Type:
N/A (Digital Format)
Paper Type
Paper Type:
N/A (Digital Format)
⚙️ Engine Specifications
Primary Engine
Engine Type:
Liquid-cooled, 2-stroke, reed valve, single-cylinder
Displacement:
124 cc (Cubic Centimeters)
Bore X Stroke:
54.0 mm x 54.5 mm
Compression Ratio:
8.8:1 (or as specified in the manual)
Intake Method:
Reed valve induction
Performance
Horsepower:
Approx. 34-38 HP (at crankshaft, varies by tuning and specific model year)
Torque:
Not explicitly stated, but significant for its displacement class
Fuel System
Carburetor Model:
Keihin PWK38 (typical for this era YZ125)
Fuel Type:
Unleaded gasoline (minimum 91 octane recommended)
Oil Mixing:
2-stroke premix oil, typically 20-40:1 ratio (refer to manual for exact specification)
Lubrication
Engine Oil Type:
Yamalube 2R or equivalent 2-stroke racing oil (for premix)
🔧 Transmission
Standard
Transmission Type:
Constant mesh, 6-speed
Clutch Type:
Wet, multi-disc
Final Drive:
Chain drive
Features
Gear Ratios:
Specific gear ratios will be detailed in the manual.
Transmission Oil Type:
Yamalube 10W-40 or equivalent motorcycle gear oil (check manual for specific viscosity and API classification).
📐 Dimensions
Exterior
Length:
Not explicitly stated, but typical for 125cc motocross bikes of the era.
Width:
Not explicitly stated, but typical for 125cc motocross bikes of the era.
Height:
Not explicitly stated, but typical for 125cc motocross bikes of the era.
Weights
Dry Weight:
Approx. 94 kg (207 lbs) (without fluids)
Wet Weight:
Not explicitly stated, but includes oil, coolant, and fuel.
🛡️ Safety Features
Ratings
Safety Certification:
Not applicable for competition off-road motorcycles in standard safety rating systems (e.g., NHTSA, Euro NCAP).
Active Features
Braking System:
Hydraulic disc brakes front and rear for effective stopping power.
Passive Features
Chassis Design:
Designed for off-road use with robust construction.
💡 Technology Features
Infotainment
Infotainment System:
Not applicable for this competition off-road motorcycle.
Driver Assistance
Electronic Aids:
None (designed for pure rider input).
Connectivity
Connectivity Features:
None (designed for pure rider input).
🔧 Maintenance
Service Intervals
Oil Change Interval:
Refer to manual for specific hours or mileage. Typically every 10-20 hours of use.
Air Filter Cleaning:
Frequent cleaning recommended, especially in dusty conditions. Check manual for interval.
Spark Plug Replacement:
Refer to manual for recommended interval (e.g., every 30-50 hours).
Chain Lubrication Adjustment:
Regularly, check tension as per manual.
Fluid Specifications
Engine Oil:
Yamalube 2R or equivalent 2-stroke racing oil (for premix).
Transmission Oil:
Yamalube 10W-40 or equivalent motorcycle gear oil.
Coolant Type:
Permanent type antifreeze coolant (ethylene glycol based), refer to manual for specific mix ratio.
Brake Fluid:
DOT 4 hydraulic brake fluid.
Known Issues
Common Wear Items:
Clutch plates, piston rings, seals (fork, engine), chain and sprockets, brake pads.
Carburetor Tuning Sensitivity:
Two-stroke carburetors can be sensitive to altitude and temperature changes, requiring periodic adjustment.
Two Stroke Engine Maintenance:
Requires diligent maintenance of the fuel/oil mixture and regular top-end rebuilds for optimal performance.
📚 Vehicle History
Brand Heritage
Yamaha Motorsports Legacy:
Yamaha has a long and successful history in motorcycle racing, particularly in motocross with the YZ lineage.
Model Evolution
Yz125 Development:
The YZ125 has been a staple in Yamaha's lineup for decades, continuously evolving with technological advancements in engine performance and chassis dynamics.
Production
Production Period:
The YZ125 has been in continuous production since its introduction.
🏆 Awards & Recognition
Recognitions
Motocross Contender:
The YZ125 has consistently been a strong contender in its class, often praised for its handling and competitive performance.
Ratings
Magazine Reviews 2002:
Contemporary motorcycle magazines likely reviewed and ranked the 2002 YZ125 against its rivals. Specific awards would be detailed in historical reviews.