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Yamaha YZ 125 2001 Motorcycle Service Repair Workshop Manual
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🏷️ Basic Information Identification Make: Yamaha Model: YZ125 Year: 2001 Vehicle Type: Motorcycle Product Name: Yamaha YZ 125 2001 Motorcycle Service Repair Workshop Manual Download 👋 Introduction Market Position Segment:...
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🏷️ Basic Information
Identification
Make:
Yamaha
Model:
YZ125
Year:
2001
Vehicle Type:
Motorcycle
Product Name:
Yamaha YZ 125 2001 Motorcycle Service Repair Workshop Manual Download
👋 Introduction
Market Position
Segment:
Performance motocross motorcycle.
Competitive Analysis
Competitors 2001:
Honda CR125R, Kawasaki KX125, Suzuki RM125, KTM 125 SX.
Key Features
Engine Type:
Two-stroke, single-cylinder, liquid-cooled.
Suspension Type:
Upside-down front forks, Monocross rear suspension.
📋 Manual Details
Coverage Areas
General Coverage:
Comprehensive service, repair, and maintenance for the 2001 Yamaha YZ125 motorcycle.
Page Count
Estimated Pages:
Refer to product listing for exact count, typically 300-500 pages for this era's detailed manuals.
Manual Type
Type:
Service Repair Workshop Manual
Language
Language:
English
Format
Format:
Digital Download (PDF)
📖 Manual Coverage
Systems Covered
Engine System:
Complete engine overhaul, disassembly, inspection, assembly, tuning, and troubleshooting.
Fuel System:
Carburetor removal, cleaning, adjustment, jetting, fuel pump operation (if applicable), fuel tank, and fuel lines.
Cooling System:
Radiator, hoses, coolant types, bleeding procedures, water pump operation and seal replacement.
Ignition System:
CDI unit, spark plug selection and gap, ignition coil, timing specifications, and troubleshooting.
Transmission System:
Clutch operation, removal, inspection, and adjustment; gearbox disassembly, inspection, and reassembly; gear oil specifications.
Suspension System:
Front fork disassembly, oil replacement, seal replacement, spring rates, internal components, and rear shock absorber service and specifications.
Brake System:
Front and rear brake caliper service, hydraulic fluid replacement and bleeding, brake pad replacement, rotor inspection, and master cylinder service.
Electrical System:
Wiring diagrams, component testing (lights, horn, CDI), battery maintenance, charging system diagnostics.
Frame And Bodywork:
Frame inspection, seat removal, fuel tank removal, fenders, handlebars, and controls.
Wheels And Tires:
Tire inspection and replacement, spoke tension adjustment, wheel bearing service, and rim specifications.
Procedures Included
Preventative Maintenance:
Regular service checks, lubrication points, filter replacements, and scheduled maintenance tasks.
Troubleshooting Guide:
Diagnostic flowcharts and common problem identification for engine, electrical, and mechanical issues.
Engine Rebuild:
Step-by-step instructions for complete engine disassembly, cleaning, inspection of internal components (piston, rings, cylinder, crankshaft, bearings), and reassembly.
Carburetor Tuning:
Detailed procedures for carburetor adjustment, idle speed setting, and main jet/pilot jet selection for varying conditions.
Suspension Servicing:
Fork seal replacement, oil level and viscosity adjustments, and rear shock absorber maintenance.
Brake Bleeding:
Proper procedures for flushing and bleeding the hydraulic brake system.
Electrical Diagnostics:
Interpreting wiring diagrams, testing components with a multimeter, and troubleshooting electrical faults.
Technical Depth
Depth:
Comprehensive, covering basic maintenance to full engine and gearbox overhauls, including detailed torque specifications.
📊 Manual Specifications
File Format
Type:
PDF
Searchability:
Typically searchable text content allowing for quick information retrieval.
Print Quality
Quality:
High-resolution illustrations and clear text for easy readability and printing.
Binding Type
Type:
N/A (Digital Download)
Paper Type
Type:
N/A (Digital Download)
⚙️ Engine Specifications
Primary Engine
Engine Type:
Liquid-cooled, 2-stroke, reed valve, single-cylinder
Bore X Stroke:
54.0 mm x 54.5 mm
Displacement:
123 cm³ (7.52 cu in)
Compression Ratio:
8.6:1 (typical for this model, check manual for exact)
Ignition:
CDI (Capacitor Discharge Ignition)
Performance
Horsepower:
Approx. 35-40 HP (at crankshaft, vary by tuning and dyno, check manual)
Torque:
N/A (Manual provides specific torque figures for components)
Fuel System
Carburetor:
Keihin PWK38 (38mm) slide valve, with Power Jet
Fuel Type:
Unleaded gasoline, 91 octane or higher recommended
Fuel Mixture:
20:1 ratio of gasoline to 2-stroke oil (for premix, check manual for exact recommendations)
Engine Oil
Transmission Oil Type:
Yamaha Yamalube 10W-30 API SE or SF (check manual for specific designation and capacity)
Transmission Oil Capacity:
0.70 Liters (0.74 US qt)
Cooling System
Coolant Type:
Ethylene glycol based antifreeze with deionized water, 50:50 mixture
🔧 Transmission
Standard
Transmission Type:
Constant mesh 6-speed sequential
Features
Clutch Type:
Wet, multiple-disc
Final Drive:
Chain drive
📐 Dimensions
Exterior
Overall Length:
2170 mm (85.4 in)
Overall Width:
830 mm (32.7 in)
Overall Height:
1285 mm (50.6 in)
Wheelbase:
1475 mm (58.1 in)
Ground Clearance:
340 mm (13.4 in)
Weights
Dry Weight:
93 kg (205 lbs)
Curb Weight:
Not Specified (typically includes fluids)
Wheels And Tires
Front Tire:
80/100-21 51M
Rear Tire:
100/90-19 57M
Suspension Travel
Front Suspension Travel:
275 mm (10.8 in)
Rear Suspension Travel:
280 mm (11.0 in)
🛡️ Safety Features
Ratings
Crash Safety:
N/A (Motorcycles typically do not have standardized crash ratings like cars).
Active Features
Braking System:
Hydraulic disc brakes front and rear.
Passive Features
Lighting:
Headlight, taillight, brake light.
💡 Technology Features
Infotainment
System:
N/A (Pure performance motocross bike, no infotainment features).
Driver Assistance
Features:
N/A (No electronic rider aids or driver assistance systems).
Connectivity
Features:
N/A (No onboard electronics for connectivity).
🔧 Maintenance
Service Intervals
Oil Change Transmission:
Every 15 hours or annually (refer to manual for precise intervals based on usage).
Air Filter Cleaning:
Every 5-10 hours of riding or as needed, especially in dusty conditions.
Spark Plug Inspection:
Every 10-15 hours of riding.
Chain Cleaning Lubrication:
Every 5-10 hours of riding or after wet rides.
Fluid Specifications
Coolant:
Yamaha Genuine Coolant or equivalent (50% ethylene glycol and 50% deionized water).
Brake Fluid:
DOT 3 or DOT 4 hydraulic brake fluid.
Fork Oil:
Yamalube SAE 0W-30 or equivalent (check manual for exact viscosity and level).
Known Issues
Common Wear Items:
Clutch plates, piston and rings, spark plug, air filter, wheel bearings, fork seals, chain and sprockets.
Carburetor Jetting:
Can require adjustment for different altitudes and temperatures to maintain optimal performance and prevent premature engine wear.
Suspension Seals:
Fork seals can be prone to leaks, especially with aggressive riding. Regular inspection and timely replacement are recommended.
📚 Vehicle History
Brand Heritage
Manufacturer:
Yamaha Motor Company, Ltd. is a Japanese manufacturer of motorcycles, marine products, and other motorized products.
Model Evolution
Yz Series Significance:
The YZ series has a long and successful history in motocross racing, known for its performance and handling.
2001 Model Year Updates:
The 2001 YZ125 received significant updates including a revised chassis, new suspension settings, and a refined engine for improved power delivery and handling.
Production
Manufacturing Origin:
Japan
🏆 Awards & Recognition
Recognitions
Racing Success:
The YZ125 platform has a strong history of success in amateur and professional motocross racing. Specific awards for the 2001 model would be tied to race results.
Ratings
Review Aggregates:
Reviews from the era would generally praise its sharp handling and competitive power for a 125cc class machine.