Yamaha TZ125 Service Repair Manual

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Basic Information Identification Make: Yamaha Model: TZ125 Model Years: 1995, 1996, 1997 Generation Generation Code: G1/G Introduction Market Position Market Segment: Competition Motorcycles (Track-focused 125cc class) Competitive Analysis Key Competitors:...

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Type: Motorcycle

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Sku: 24143

Tags: Marine Motorcycle Sterndrive TZ125 Yamaha

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Description

Basic Information
Identification
Make:	Yamaha
Model:	TZ125
Model Years:	1995, 1996, 1997
Generation
Generation Code:	G1/G

Introduction
Market Position
Market Segment:	Competition Motorcycles (Track-focused 125cc class)
Competitive Analysis
Key Competitors:	Honda RS125, Aprilia RS125 (though TZ is more dedicated track machine)
Key Features
Purpose:	High-performance, track-only racing motorcycle designed for entry-level and intermediate racing categories.
Manual Value Proposition:	Official Yamaha manual, identical to those used by professional mechanics, offering authoritative guidance for accurate repairs and maintenance.

Manual Details
Coverage
Manual Type:	Service Repair Manual
Pages
Page Count:	243
Language
Language:	English
Format
File Format:	PDF

Manual Coverage
Systems
Systems Covered:	Engine, Gearbox & Clutch, Cooling System, Fuel System, Braking System, Suspension, Electrical System, Body & Fixtures, Exhaust System, Wheels & Tyres
Procedures
Procedures Included:	Maintenance, Repair, Troubleshooting, Diagnostics, Technical Specifications, Wiring Diagrams
Troubleshooting Guides:	Comprehensive troubleshooting sections for common problems, guiding diagnosis and repair.
Depth
Technical Depth:	Comprehensive (covering all major repair and maintenance procedures, suitable for professional mechanics and advanced DIY users)
Technical Detail
Wiring Diagrams Coverage:	Detailed electrical system wiring diagrams included, essential for troubleshooting electrical issues.
Systems Covered
Exhaust System Details:	Information on the 2-stroke expansion chamber exhaust system, crucial for tuning 2-stroke performance.
Body And Fixtures:	Covers fairings, seat, fuel tank, and other bodywork components for removal, installation, and repair.
Wheels And Tyres:	Information on wheel bearings, tire sizes, and mounting procedures. Specific tire recommendations not usually in manual, but sizes are.
Technical Depth
Component Disassembly Reassembly:	Detailed, step-by-step instructions for complete disassembly and reassembly of all major motorcycle components.

Manual Specifications
File Attributes
PDF Quality:	High-resolution, searchable text
Usability
Printable Pages:	Yes (allows users to print specific sections as needed)
Searchable Text:	Yes (Enables quick access to specific information through keyword searches).
Binding Type
Binding Type:	N/A (Digital PDF)
Paper Type
Paper Type:	N/A (Digital PDF)

Engine Specifications
Primary Engine
Engine Type:	2-Stroke, Single Cylinder, Reed Valve, Water-Cooled
Bore X Stroke:	56.0 mm x 50.7 mm
Displacement:	124.7 cc
Compression Ratio:	7.0:1 (approx.)
Performance
Horsepower:	Approximately 35-40 HP (Varies by tuning and specifications, actual dyno results may differ)
Torque:	Data not readily available, but optimized for high RPM power delivery.
Power Band:	Designed for peak power delivery in the upper RPM range, characteristic of 125cc 2-stroke racing engines.
Fuel System
Carburetor:	Mikuni TMX35 (typical for this era)
Fuel Type:	High-octane Unleaded Gasoline (with 2-stroke oil premix or injection)
Cooling System
Cooling Method:	Water-Cooled
Lubrication
Lubrication System:	Premix or Oil Injection System

Transmission
Gearbox
Transmission Type:	6-Speed Constant Mesh
Clutch
Clutch Type:	Wet Multi-Plate
Features
Gear Ratios:	Specific ratios detailed within the manual, crucial for track performance tuning.
Transmission Fluid
Transmission Oil Spec:	Yamaha recommends specific gear oil for the transmission, detailed in manual.

Dimensions
Exterior
Overall Length:	Refer to manual for exact dimensions, track-specific focus.
Weights
Dry Weight:	Approximately 120-130 kg (very lightweight for performance)

Safety Features
Ratings
Safety Rating:	N/A (As a track-only motorcycle, it is not subject to road-legal safety standards or ratings).
Active Features
Braking System Front:	Hydraulic Disc (Dual piston caliper typical)
Braking System Rear:	Hydraulic Disc (Single piston caliper typical)
Passive Features
Frame Type:	Aluminum Deltabox frame (for rigidity and light weight)

Technology Features
Infotainment
Infotainment System:	N/A (Track-focused racing motorcycle, no infotainment features).
Driver Assistance
Driver Assistance Systems:	N/A (No electronic rider aids typically found on racing motorcycles of this era).
Connectivity
Connectivity Features:	N/A
Engine Technology
Reed Valve System:	Advanced reed valve induction for improved intake efficiency and power delivery.
Chassis Technology
Frame Design:	Yamaha's signature Deltabox aluminum frame, providing exceptional rigidity and handling characteristics.

Maintenance
Service Intervals
Oil Change Interval:	Refer to manual for specific interval, generally before significant track events.
Spark Plug Replacement:	Refer to manual, typically based on hours of operation or specific racing needs.
Fluid Specifications
Coolant Type:	High-quality, water-based coolant with anti-corrosion additives. Specific type in manual.
Brake Fluid Type:	DOT 4 recommended. Specific recommendations in manual.
Two Stroke Oil:	High-performance synthetic 2-stroke racing oil. Manual will specify grades and brands.
Known Issues
Common Wear Items:	Piston rings, clutch plates, chain and sprockets, wheel bearings, brake pads, due to high-performance operation.
Carburetor Tuning:	Critical for performance; requires careful jetting based on track conditions, altitude, and fuel. Manual provides baseline settings.
Maintenance Tasks
Decarbonization:	Regular decarbonization of exhaust ports and cylinder head is essential for 2-stroke engines.
Suspension Setup:	Manual covers adjustment procedures for front forks and rear shock absorber for track tuning.
Engine Rebuild:	Detailed procedures for top-end and bottom-end engine rebuilds, including torque specifications and tolerances.
Gearbox Oil Level Check:	Procedures for checking and topping up gearbox oil.
Clutch Adjustment:	Instructions on adjusting clutch cable free play for optimal engagement.

Vehicle History
Brand Heritage
Yamaha Motorsports Legacy:	Yamaha has a long and storied history in motorcycle racing across all disciplines, including Grand Prix.
Model Evolution
Tz Series Heritage:	The TZ series has been Yamaha's backbone for production-based racing for decades, continuously evolved for performance.
Production
Production Period Overview:	TZ125 models have been produced in various iterations since the late 1970s.

Awards & Recognition
Recognitions
Racing Class Dominance:	The TZ125 has been a dominant force in 125cc production racing classes worldwide for its class-leading performance and reliability.
Ratings
Owner Satisfaction:	High satisfaction among dedicated racers for its performance potential and tunability.