Yamaha TZ125 TZ125G1 1990-2005 Workshop Service Manual

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Taper: Motorcycle

Distributeur:

UGS: 56705

Mots clés: 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 Marine Motorcycle Sterndrive TZ125 TZ125G1 Yamaha

Variantes de produits

Description

This manual covers the TZ125G1, a performance racing motorcycle produced from 1990 to 2005. Engineered for track days and club racing, the TZ125 is renowned for its high-revving, liquid-cooled two-stroke engine, lightweight race-bred chassis, and exceptional handling capabilities. Its design emphasizes extensive tuning potential and a focus on delivering peak performance in competitive environments, building on a rich heritage in Grand Prix racing. This comprehensive workshop service and repair manual provides detailed guidance for maintaining and repairing your TZ125G1. It covers all essential systems, including engine overhaul, transmission, chassis, electrical systems, and braking. The manual offers step-by-step instructions for periodic maintenance, troubleshooting common faults, and complete component repair and overhaul procedures, making it an indispensable resource for owners and technicians seeking to ensure optimal performance and longevity.

🏷️ Basic Information

Identification

Make:

Yamaha

Model:

TZ125G1

Production Years Covered:

1990-2005

Codes

Manual Code:

Not Specified

👋 Introduction

Market Position

Segment:

Performance Racing Motorcycle

Usage:

Track days, club racing, high-performance riding.

Competitive Analysis

Competitors 125Cc Class:

Honda RS125, Aprilia RS 125 (though TZ is more track-focused).

Key Features

Engine Type:

High-revving two-stroke, liquid-cooled, single-cylinder.

Chassis Design:

Lightweight, race-bred chassis for exceptional handling.

Tuning Potential:

Designed for extensive tuning and modification for racing.

Suspension:

High-performance adjustable front forks and rear shock absorber.

📋 Manual Details

Coverage Areas

Primary Coverage:

Workshop Service and Repair

Secondary Coverage:

Periodic Maintenance, Troubleshooting, Overhaul Procedures, Wiring Diagrams

Page Count

Estimated Page Count:

Hundreds (as per description)

Manual Type

Type:

Workshop Service Manual / Repair Manual

Language

Language:

English

Format

Format:

PDF Download

📖 Manual Coverage

Systems Covered

Engine System:

Complete engine overhaul, tuning, carburetor, ignition system, cooling system (if applicable), lubrication.

Transmission System:

Gearbox inspection, maintenance, repair, clutch operation.

Chassis System:

Frame inspection, suspension (front and rear), steering, wheels, tires.

Electrical System:

Wiring diagrams, lighting, ignition, charging system, battery, instrumentation.

Braking System:

Brake caliper, master cylinder, brake lines, fluid replacement, adjustments.

Bodywork And Trim:

Fairings, body panels, seat, controls, exhaust system.

Carburetor System:

Detailed breakdown, adjustment, cleaning, and jetting information for Mikuni carburetors.

Fuel System:

Fuel tank, lines, fuel cock, carburetor.

Procedures Included

Maintenance:

Regular scheduled maintenance, oil changes, filter replacements, chain adjustment, spark plug service.

Troubleshooting:

Diagnostic procedures for common and uncommon faults, symptom-based solutions.

Repair:

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

Overhaul:

Detailed procedures for engine, gearbox, and other major component rebuilds.

Engine Tuning:

Information on port timing, exhaust modifications, and ignition curve adjustments.

Diagnostics:

Systematic diagnosis of electrical and mechanical faults.

Technical Depth

Depth:

Comprehensive, suitable for professional technicians and advanced DIY enthusiasts.

Detail Level:

Detailed diagrams, torque specifications, clearances, adjustment procedures.

📊 Manual Specifications

File Format

Format:

Requirements:

Adobe PDF Reader, WinRAR

Compatibility:

All Versions of Windows & Mac

Print Quality

Printability:

Full Printable

Zoom Capability:

YES (Zoom IN/OUT)

Binding Type

Binding:

Digital Download (Printable)

Paper Type

Paper Type Suggestion:

Not Applicable (Digital)

⚙️ Engine Specifications

Primary Engine

Engine Type:

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

Bore X Stroke:

Typically around 56 mm x 50.7 mm (subject to specific TZ125 variant evolution).

Displacement:

124 cc

Compression Ratio:

Variable, typically high for racing (e.g., 10.0:1 or higher).

Cooling System:

Liquid-cooled

Performance

Horsepower:

Estimated 30-40+ HP (depending on year, tuning, and exhaust).

Torque:

Not typically the primary focus for this class, but significant at high RPM.

Fuel System

Carburetor:

Mikuni VM series (e.g., VM28SS or similar high-performance variant).

Fuel Type:

High-octane gasoline, often mixed with two-stroke oil.

Ignition System

Ignition:

CDI (Capacitor Discharge Ignition), often with adjustable timing.

🔧 Transmission

Standard

Type:

6-speed constant mesh

Optional

Features:

Close-ratio gear sets for optimal track performance.

Features

Clutch Type:

Wet, multi-plate

📐 Dimensions

Exterior

Length:

Approximately 1915 mm (varies slightly by year).

Width:

Approximately 690 mm (varies slightly by year).

Height:

Approximately 1050 mm (varies slightly by year).

Weights

Dry Weight:

Around 90-95 kg (highly dependent on year and specific race configuration).

Fuel Capacity:

Approximately 9.5 - 10.5 Liters.

🛡️ Safety Features

Ratings

Classification:

Competition Motorcycle (not street legal in most configurations).

Active Features

Handling:

Designed for extreme lean angles and precise control.

Passive Features

Frame Construction:

Lightweight aluminum alloy frame for rigidity and mass centralization.

💡 Technology Features

Infotainment

Features:

Basic instrumentation focused on essential riding information (tachometer, speedometer, temperature).

Driver Assistance

Features:

None (This is a pure racing machine).

Connectivity

Features:

None.

🔧 Maintenance

Service Intervals

Oil Change:

After every few race sessions or as specified for track use (pre-mix or oil injection system).

Spark Plug:

Regularly inspected and replaced based on plug type and usage.

Chain Adjustment:

Frequent checks and adjustments required due to high performance.

Engine Rebuild:

Typically performed after a set number of race hours or performance degradation.

Fluid Specifications

Coolant:

High-quality motorcycle-specific coolant with anti-corrosion additives.

Transmission Oil:

Yamaha's recommended 2-stroke transmission oil or equivalent.

Brake Fluid:

DOT 4 or DOT 5.1, depending on specific brake system requirements.

Premix Ratio:

Specific ratio for two-stroke oil to gasoline as per manual or manufacturer recommendation.

Known Issues

Two Stroke Tuning:

Sensitivity to fuel quality, jetting, and environmental conditions.

Clutch Wear:

Can experience rapid wear under aggressive track use.

Engine Seals:

Regular inspection and replacement of crank seals are crucial.

📚 Vehicle History

Brand Heritage

Yamaha Racing Legacy:

Yamaha has a long and illustrious history in Grand Prix motorcycle racing, with the TZ series being a cornerstone of their 125cc and 250cc efforts.

Model Evolution

Tz Lineage:

The TZ125 evolved from earlier Yamaha racing designs, becoming a dominant force in its class for many years.

Production

Manufacturing Location:

Japan

Production Duration:

The TZ125 model line spanned several decades, with the G1 designation representing a specific period of its development.

🏆 Awards & Recognition

Recognitions

Racing Success:

The TZ125 platform has a long history of championship wins and podium finishes in various national and international 125cc racing series.