Yamaha YZ125 Workshop Repair Manual All 2009-2010 ModelS COVERED

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🏷️ Basic Information Identification Make: Yamaha Model: YZ125 Model Variant: Motocross Competition Motorcycle Codes Year Code: Specific to 2009 and 2010 models 👋 Introduction Market Position Category: High-performance 125cc two-stroke...

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类型: Motorcycle

斯库: 270392

标签: 2009 2010 AT Models Motorcycle Motorcycles Yamaha YZ125

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Description

🏷️ Basic Information

Identification

Make:

Yamaha

Model:

YZ125

Model Variant:

Motocross Competition Motorcycle

Codes

Year Code:

Specific to 2009 and 2010 models

👋 Introduction

Market Position

Category:

High-performance 125cc two-stroke motocross motorcycle.

Target Audience:

Motocross racers, off-road enthusiasts, and motorcycle mechanics.

Competitive Analysis

Competitors:

KTM 125 SX, Honda CR125R (previous generations), Suzuki RM125 (previous generations), Kawasaki KX125 (previous generations).

Key Features

Performance Focus:

Designed for aggressive competition, emphasizing power-to-weight ratio and handling.

Engine Type:

Liquid-cooled, reed valve, 2-stroke, single-cylinder.

Suspension Technology:

Advanced KYB Speed Sensitive System front forks and KYB rear shock for superior damping and adjustability.

📋 Manual Details

Coverage Areas

Covered Models:

All Yamaha YZ125 models from 2009 to 2010 inclusive.

Page Count

Estimated Page Count:

Approximately 500-700 pages (typical for a comprehensive workshop manual).

Manual Type

Type:

Workshop Service Repair Manual

Language

Language:

English

Format

Format:

Digital Download (PDF)

📖 Manual Coverage

Systems Covered

Engine And Powertrain:

Complete engine assembly, disassembly, tuning, troubleshooting, and component specifications for the 125cc liquid-cooled 2-stroke engine.

Suspension And Steering:

Front fork (KYB Speed Sensitive System) and rear monoshock (KYB) overhaul, tuning, and adjustment procedures; steering system.

Braking System:

Front and rear hydraulic disc brake system maintenance, including caliper, master cylinder, lines, and fluid replacement.

Fuel And Ignition:

Carburetor (Mikuni VM26) specifications, tuning, and overhaul; ignition system diagnostics and components (CDI, stator, spark plug).

Cooling System:

Liquid cooling system maintenance, including radiator, coolant hoses, and water pump.

Electrical System:

Basic electrical system, lighting, ignition, and wiring diagrams for diagnostic purposes.

Chassis And Frame:

Frame, sub-frame, swingarm, and bearing maintenance and inspection.

Procedures Included

Scheduled Maintenance:

Detailed maintenance schedules, including oil changes, filter replacements, chain adjustments, and general inspections.

Engine Overhaul:

Complete engine rebuild procedures, including piston, cylinder, crankshaft, and connecting rod replacement.

Suspension Tuning:

In-depth guidance on adjusting suspension settings (compression, rebound, preload) for various track conditions.

Troubleshooting:

Systematic diagnostic procedures for common issues and faults, with symptom-to-cause mapping.

Part Replacement:

Step-by-step instructions for replacing all major components and wear items.

Special Tools:

Identification of required special tools for specific repair procedures.

Technical Depth

Depth:

Comprehensive, covering everything from basic rider maintenance to full engine and suspension rebuilds.

Diagnostic Level:

Advanced diagnostics and troubleshooting for complex mechanical and electrical issues.

📊 Manual Specifications

File Format

File Type:

Searchability:

Likely text-searchable for quick information retrieval.

Print Quality

Print Readability:

Optimized for clear printing of diagrams, illustrations, and text.

Binding Type

Binding:

N/A (Digital Download - User prints and binds if desired).

Paper Type

Paper Recommendation:

Recommended: High-quality, durable paper for workshop use.

⚙️ Engine Specifications

Primary Engine

Engine Type:

125cc Liquid-Cooled 2-Stroke

Bore X Stroke:

54.0 mm x 54.5 mm

Displacement:

124cc

Compression Ratio:

Approx. 8.6:1 (with specified ignition timing and exhaust port timing)

Valve System:

Reed Valve Intake, Exhaust Power Valve System (YPVS)

Lubrication:

Pre-mix (2-stroke engine oil mixed with gasoline)

Performance

Horsepower Estimate:

Estimated 35-40 HP at peak RPM (exact figures vary by model year and tuning).

Torque Estimate:

Estimated 17-20 lb-ft at peak RPM.

Fuel System

Carburetor Model:

Mikuni VM26

Fuel Type:

Unleaded gasoline with minimum octane rating of 91.

Recommended Oil:

Yamaha recommended 2-stroke outboard motor oil or equivalent API TC, JASO FD, or ISO-L-EGD certified 2-stroke oil (for premix).

Fuel Tank Capacity:

Approximately 7.0 Liters (1.85 Gallons)

🔧 Transmission

Standard

Type:

5-Speed Manual Constant Mesh

Clutch:

Wet, Multiple-Disc

Final Drive:

Chain Drive

Features

Gear Ratios:

Specific gear ratios are detailed within the manual for each gear.

Transmission Oil Type:

Yamalube SAE 10W-30 API SE SC or SF engine oil or equivalent.

Transmission Oil Capacity:

Approximately 0.65 Liters (0.69 US qt).

📐 Dimensions

Exterior

Overall Length:

Approx. 2,160 mm (85.0 in)

Overall Width:

Approx. 825 mm (32.5 in)

Overall Height:

Approx. 1,280 mm (50.4 in)

Seat Height:

Approx. 986 mm (38.8 in)

Wheelbase:

Approx. 1,475 mm (58.1 in)

Ground Clearance:

Approx. 335 mm (13.2 in)

Weights

Wet Weight:

Approx. 94 kg (207 lbs)

Dry Weight:

Approx. 87 kg (192 lbs)

Front Tire Size:

80/100-21 M/C 51M

Rear Tire Size:

100/90-19 M/C 57M

Wheel Type:

Spoked Aluminum Rims

🛡️ Safety Features

Ratings

Safety Certifications:

N/A (Competition off-road vehicle, not subject to road safety regulations).

Active Features

Braking Performance:

Hydraulic disc brakes front and rear for effective stopping power.

Suspension Control:

Advanced suspension system designed to maintain tire contact and stability during aggressive riding.

Passive Features

Frame Construction:

Durable aluminum frame designed for rigidity and impact resistance.

Ergonomics:

Designed for rider control and comfort during competition.

💡 Technology Features

Infotainment

Features:

N/A (Competition motorcycle focused on performance, not infotainment features).

Driver Assistance

Features:

N/A (No electronic rider aids or driver assistance systems).

Connectivity

Features:

N/A (No connectivity features).

🔧 Maintenance

Service Intervals

Engine Oil Change:

Recommended every 10-15 hours of operation or as per competition usage.

Air Filter Cleaning:

Recommended every 5-10 hours of operation, or more frequently in dusty conditions.

Spark Plug Replacement:

Inspect every 15-20 hours, replace as needed based on wear and fouling.

Chain Lubrication And Adjustment:

Lubricate before every ride; check and adjust tension every 5-10 hours.

Suspension Service:

Fork oil and seal replacement recommended every 20-30 hours; full suspension service annually or as per competition schedule.

Fluid Specifications

Coolant:

Yamaha's recommended premixed coolant or a permanent type antifreeze with a 50:50 mix of ethylene glycol and distilled water.

Brake Fluid:

DOT 4 hydraulic brake fluid.

Known Issues

Common Wear Items:

Piston rings, piston, clutch plates, wheel bearings, steering head bearings, swingarm bearings, chain, and sprockets are typical wear items.

Power Valve Maintenance:

The exhaust power valve system (YPVS) requires regular cleaning and inspection to ensure proper function and prevent carbon buildup.

Carburetor Tuning:

Proper jetting of the Mikuni VM26 carburetor is crucial for optimal performance and can vary with altitude, temperature, and humidity.

📚 Vehicle History

Brand Heritage

Manufacturer:

Yamaha Motor Corporation.

Heritage Focus:

Long-standing reputation for producing high-performance, reliable motorcycles, particularly in the off-road and motocross segments.

Model Evolution

Yz Lineage:

The YZ125 is part of Yamaha's storied YZ line, which has been a dominant force in motocross for decades.

Key Updates 2009-2010:

The 2009-2010 models represent a refinement of earlier generations, incorporating improvements in engine performance, suspension tuning, and chassis components to maintain competitiveness.

Production

Production Period:

The YZ125 has been in continuous production for many years, with the 2009-2010 models being part of its modern iteration.

Manufacturing Location:

Typically manufactured in Japan or by Yamaha's international production facilities.

🏆 Awards & Recognition

Recognitions

Motocross Wins:

The YZ125 platform has a rich history of success in amateur and professional motocross racing, contributing to Yamaha's brand prestige.

Ratings

Customer Reviews:

Highly regarded by riders for its light weight, nimble handling, and exciting 2-stroke power delivery.

Certifications

Manual Quality:

This workshop manual is a professional-grade document providing factory-accurate information for effective repair and maintenance.