Now Yamaha YZ125 YZ 125 2007 07 Service Repair Workshop Manual

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🏷️ Basic Information Identification Make: Yamaha Model: YZ125 Year: 2007 Model Code: YZ125X Engine Type: 2-Stroke Category: Motocross Generation Generation Designation: Fifth Generation (1996-2001), Sixth Generation (2002-2014) Current Generation Year...

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Type: Motorcycle

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Sku: 245540

Tags: 2007 Motorcycle Motorcycles Yamaha YZ 125 YZ Models YZ125

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Description

🏷️ Basic Information

Identification

Make:

Yamaha

Model:

YZ125

Year:

Model Code:

YZ125X

Engine Type:

2-Stroke

Category:

Motocross

Generation

Generation Designation:

Fifth Generation (1996-2001), Sixth Generation (2002-2014)

Current Generation Year Range:

2002-2014

👋 Introduction

Market Position

Segment:

Performance Motocross Motorcycle

Competitors 2007:

Honda CR250R, Kawasaki KX250, KTM 250 SX, Suzuki RM250

Competitive Analysis

Yz125 Advantage 2007:

Renowned for its sharp handling, potent 2-stroke powerband, and tractable power delivery. The 2007 model continued to refine the chassis and suspension.

Key Features

Engine Technology:

Yamaha Power Valve System (YPVS) for enhanced low-to-mid range torque and broader powerband.

Suspension Technology:

Industry-leading Kayaba Speed-Sensitive System (SSS) front forks and Monoshock rear suspension for superior damping and adjustability.

Chassis Design:

Lightweight aluminum frame providing excellent rigidity and rider feedback.

Performance Focus:

Optimized for competitive motocross racing and aggressive off-road riding.

📋 Manual Details

Coverage Areas

Primary Coverage:

Yamaha YZ125 (2007 Model)

Secondary Coverage Notes:

Will work with similar years/models, referencing broader YZ125 lineage.

Page Count

Estimated Page Count:

400-500

Manual Type

Manual Type:

Service Repair Workshop Manual

Language

Language:

English

Format

Format:

Digital (PDF)

📖 Manual Coverage

Systems Covered

Engine System:

Complete overhaul, troubleshooting, component diagnosis, top-end, bottom-end, cooling system (liquid).

Fuel System:

Carburetor tuning and overhaul (Mikuni VM34), fuel pump, fuel lines, fuel tank.

Exhaust System:

Pipe and silencer maintenance, proper sealing.

Ignition System:

CDI unit, spark plug, ignition timing, stator and flywheel troubleshooting.

Clutch System:

Clutch plate replacement, clutch lever adjustment, hydraulic clutch system (if applicable to specific variants, though this is typically cable-actuated).

Transmission System:

Gearbox disassembly, inspection, and reassembly, gear selection, shift mechanism, lubrication.

Suspension System:

Front forks (Kayaba 48mm Speed-Sensitive System - SSS) overhaul, seal replacement, oil levels and viscosity; rear shock absorber (Monoshock) overhaul, linkage maintenance, spring adjustment.

Braking System:

Front and rear brake caliper service, pad replacement, master cylinder overhaul, hydraulic line bleeding, rotor inspection.

Wheel And Tire System:

Wheel bearing replacement, spoke tensioning, tire mounting and balancing, rim maintenance.

Electrical System:

Wiring diagrams, lighting (if applicable for specific models), kill switch, basic troubleshooting.

Cooling System:

Radiator maintenance, coolant type and capacity, water pump service.

Chassis And Frame:

Frame inspection, steering head bearing service, swingarm bearing maintenance.

Bodywork And Plastics:

Fairing removal and installation, seat, tank, fenders.

Procedures Included

Preventative Maintenance:

Scheduled service intervals, lubrication points, filter replacements, spark plug checks.

Troubleshooting:

Diagnostic flowcharts for common problems, symptom-based troubleshooting.

Repair Procedures:

Step-by-step instructions for component disassembly, repair, and reassembly.

Diagnostics:

Component testing procedures, specifications for key measurements.

Adjustment Procedures:

Carburetor jetting, clutch, throttle cable, suspension settings.

Special Tools:

Identification and usage of specialized tools required for certain procedures.

Technical Depth

Depth Level:

Comprehensive - covers basic maintenance to full engine rebuilds and suspension overhauls.

Diagnostic Capability:

Advanced, including electrical system diagnostics and component testing.

📊 Manual Specifications

File Format

File Type:

Searchability:

Text-searchable for efficient information retrieval.

Print Quality

Image Resolution:

High-resolution images and diagrams for clarity.

Vector Diagrams:

Includes vector-based diagrams for precise detail.

Binding Type

Binding:

N/A (Digital Format)

Paper Type

Paper:

N/A (Digital Format)

⚙️ Engine Specifications

Primary Engine

Engine Type:

Liquid-cooled, 2-stroke, reed valve, YPVS

Displacement:

124cc (7.57 cu. in.)

Bore X Stroke:

54mm x 54.5mm

Compression Ratio:

8.2:1 (when TDC is 1.0mm)

Carburetor:

Mikuni VM34, single, with throttle position sensor (TPS)

Spark Plug:

NGK BR9ES or equivalent

Performance

Horsepower Estimated:

~35-38 HP (at crankshaft, estimated)

Torque Estimated:

~18-20 lb-ft (at crankshaft, estimated)

Fuel System

Fuel Type:

Unleaded gasoline (91 octane or higher recommended)

Fuel Mixture:

Pre-mix (50:1 ratio of gasoline to high-quality 2-stroke engine oil)

Fuel Tank Capacity:

7.0 Liters (1.85 US gal)

🔧 Transmission

Standard

Transmission Type:

Constant mesh 6-speed

Clutch Type:

Wet, multi-plate, cable-actuated

Features

Gear Ratios:

Refer to manual for specific ratios (e.g., 1st: 2.615, 2nd: 1.933, 3rd: 1.500, 4th: 1.235, 5th: 1.045, 6th: 0.917)

Final Drive:

Chain drive (520 O-ring type)

Transmission Oil Type:

Yamalube 10W-30 or equivalent API 'SE' or 'SF' 2-stroke transmission oil

Transmission Oil Capacity:

0.65 Liters (0.69 US qt)

📐 Dimensions

Exterior

Overall Length:

2130mm (83.9 in.)

Overall Width:

825mm (32.5 in.)

Overall Height:

1260mm (49.6 in.)

Seat Height:

970mm (38.2 in.)

Wheelbase:

1475mm (58.1 in.)

Ground Clearance:

360mm (14.2 in.)

Weights

Wet Weight:

96kg (211.6 lbs) (fully fueled and with all standard equipment)

Dry Weight:

89kg (196.2 lbs)

Front Fork Travel:

300mm (11.8 in.)

Rear Shock Travel:

315mm (12.4 in.)

🛡️ Safety Features

Ratings

Safety Certification:

Not applicable for off-road competition motorcycles in the same way as street-legal vehicles. Designed for closed-course competition.

Active Features

Braking System Type:

Hydraulic disc brakes, front and rear

Front Brake Rotor Diameter:

250mm (9.8 in.)

Rear Brake Rotor Diameter:

245mm (9.6 in.)

Passive Features

Frame Construction:

Lightweight aluminum alloy twin-spar frame for strength and rigidity.

💡 Technology Features

Infotainment

Infotainment System:

N/A - This is a competition motocross motorcycle, not equipped with infotainment systems.

Driver Assistance

Driver Assistance Features:

N/A - This is a competition motocross motorcycle, not equipped with driver assistance features.

Connectivity

Connectivity Features:

N/A - This is a competition motocross motorcycle, not equipped with connectivity features.

Engine Management

Throttle Position Sensor Tps:

Integrated TPS on the carburetor for optimized fuel delivery and YPVS control.

🔧 Maintenance

Service Intervals

Oil Change Interval:

Every 15-20 hours of riding or annually. Refer to manual for specific schedule.

Air Filter Cleaning:

After every 5-10 hours of riding, or more frequently in dusty conditions.

Spark Plug Inspection:

Every 10-15 hours of riding.

Chain Maintenance:

Inspect and lubricate chain every 5-10 hours of riding; adjust tension as needed.

Suspension Service:

Fork seal replacement as needed, fork oil change every 20-30 hours. Linkage bearings inspected every 20 hours.

Fluid Specifications

Engine Oil Type:

Yamalube 2R or equivalent high-performance 2-stroke racing oil.

Cooling System Coolant:

Permanent type anti-freeze coolant (e.g., Yamalube Coolant) mixed 50:50 with distilled water.

Brake Fluid:

DOT 4 hydraulic brake fluid.

Known Issues

Common Wear Items:

Piston, piston rings, clutch plates, brake pads, wheel bearings, fork seals.

Potential Engine Issues:

Carburetor jetting sensitivity to altitude and temperature; YPVS operation issues if not maintained; premature wear if pre-mix is incorrect or of low quality.

Suspension Considerations:

Proper setup is crucial for optimal performance; frequent fork seal replacement may be needed with hard use.

📚 Vehicle History

Brand Heritage

Yamaha Motor Cycle Division:

Founded in 1955, Yamaha Motor Company is a global leader in motorcycles, renowned for innovation and racing success.

Model Evolution

Yz Lineage:

The YZ series has a long and storied history in motocross, dating back to the early 1970s. The YZ125 has consistently been a benchmark in the 125cc class.

Yz125 Key Milestones Pre 2007:

Introduction of liquid cooling, reed valve induction, YPVS, aluminum frames, and advanced suspension (like the SSS forks introduced in 2006) have marked its progression.

Production

Production Location:

Japan

Model Introduction Year:

First YZ125 introduced in 1974.

🏆 Awards & Recognition

Recognitions

Motocross Magazine Awards Past:

The YZ125 has consistently received high marks and awards from leading motocross publications for its performance, handling, and engine characteristics throughout its lineage.

Ratings

Suspension Performance Rating:

Generally rated as top-tier in its class due to the Kayaba SSS components.

Certifications

Competition Homologation:

Designed to meet FIM and AMA specifications for motocross racing, where applicable.