Vehicle Segment:
Single-cylinder, 125cc two-stroke racing motorcycle, primarily for track use and competition
Competitors Circa 1995:
Honda RS125R, Aprilia RS 125 GP, Cagiva Mito 125
Engine Type:
High-performance 125cc liquid-cooled, reed-valve inducted two-stroke single
Chassis Design:
Lightweight aluminum or steel frame, advanced suspension components for racing
Performance Focus:
Designed for agility, rapid acceleration, and high-revving power delivery typical of 125cc Grand Prix racing machines
Primary Focus:
Service and Repair
Diagnostic Coverage:
Comprehensive diagnostic procedures
Maintenance Coverage:
All scheduled maintenance and routine checks
Rebuild Coverage:
Complete engine, transmission, and chassis rebuilds
Restoration Coverage:
Procedures applicable to refurbishing and restoring the vehicle
Estimated Pages:
Varies based on specific model year/variant detail, but described as comprehensive A-Z
Type:
Digital Workshop Repair Manual
Content Source:
Professional Technicians and Mechanics
Language:
English (assumed based on product description)
File Format:
PDF Download
Engine:
Full engine disassembly, assembly, tuning, and troubleshooting
Fuel System:
Carburetor tuning, fuel pump, fuel lines, and tank maintenance
Ignition System:
CDI unit, spark plugs, wiring, and timing
Cooling System:
Radiator, water pump, hoses, and coolant specifications
Transmission Clutch:
Clutch operation, adjustment, and component replacement; gearbox disassembly and reassembly
Suspension:
Front forks (damping, seals, oil), rear shock absorber, linkage maintenance
Brakes:
Front and rear brake systems, caliper service, master cylinder overhaul, fluid replacement
Electrical System:
Wiring diagrams, lighting, battery, starter, charging system
Frame Chassis:
Frame integrity checks, steering head bearings, swingarm maintenance
Bodywork:
Fairing removal, installation, and repair
Wheels Tires:
Wheel bearing service, tire replacement, rim specifications
General Maintenance:
Oil changes, filter replacements, chain lubrication and adjustment
Troubleshooting:
Detailed fault finding guides for various systems
Component Replacement:
Step-by-step instructions for replacing all major components
Recalibration:
Carburetor synchronization and jetting adjustments
Performance Tuning:
Information potentially related to optimizing engine performance within stock parameters
Depth:
Expert-level, covering complete disassembly and reassembly of all major mechanical and electrical components
Diagnostic Tools:
Procedures align with those requiring standard motorcycle workshop tools and diagnostic techniques
Compatibility:
Microsoft Windows (95 through 7) and all Mac computers
Visuals:
High quality photos, illustrations, and diagrams
Text Searchability:
Likely searchable text within the PDF for easy information retrieval
Format Type:
Digital (Downloadable PDF)
Physical Equivalent:
N/A (Digital format implies no physical paper)
Engine Type:
2-stroke, single-cylinder, liquid-cooled, reed-valve inducted
Bore X Stroke:
56.0 mm x 50.7 mm (typical for this era TZ125)
Horsepower:
~35-40 HP @ ~12,000 RPM (estimated, actual varies with tuning and class rules)
Torque:
~2.5-2.8 kgf-m @ ~11,000 RPM (estimated)
Carburetor:
Mikuni TMX Series (e.g., 34mm or 36mm, specific model number would be in manual)
Fuel Type:
Premium Unleaded gasoline with 2-stroke oil pre-mix (or oil injection system, manual will specify)
Type:
Digital CDI (Capacitor Discharge Ignition)
Classification:
Competition/Racing Motorcycle - not typically rated by standard automotive safety organizations like NHTSA or Euro NCAP.
Braking System:
Hydraulic disc brakes front and rear (e.g., twin-piston caliper front, single-piston rear)
Frame Construction:
Rigid frame designed for track stability and rider feedback
Oil Change:
Recommended every 1,000-1,500 km or as per manual; critical for 2-stroke engines. Specific interval would be in the manual.
Spark Plug Replacement:
Recommended based on usage; frequent replacement for high-performance use. Manual will specify type and interval.
Fork Oil Change:
Recommended every 6,000-10,000 km for optimal suspension performance. Manual will specify oil type and viscosity.
Coolant:
Ethylene glycol-based coolant with a 50/50 mix of distilled water (specific Yamaha coolant or equivalent).
Brake Fluid:
DOT 4 recommended for hydraulic brake systems.
2-Stroke Oil:
High-quality synthetic 2-stroke racing oil meeting JASO FD or similar performance standards.
Wear And Tear:
Typical for high-revving two-strokes: piston ring wear, cylinder scoring, carbon buildup in exhaust and ports, clutch wear.
Carburetor Issues:
Can be sensitive to altitude, temperature, and jetting; requires regular cleaning and tuning.
Suspension Seals:
Fork seal leaks are common with age and hard use.
Motorsport Legacy:
Yamaha has a long and successful history in motorcycle racing, particularly in the 125cc and 250cc classes.
Tz Series Significance:
The TZ series has been a cornerstone for privateer racers and track day enthusiasts for decades, evolving with technological advancements in two-stroke engine design and chassis dynamics.
Manufacturing Era:
The TZ 125 was produced in various iterations from the late 1970s through the early 2000s.
Racing Success:
The TZ 125 was a highly competitive platform in various national and international 125cc racing championships during its production run.
Performance Benchmark:
Considered a benchmark for accessible, competitive two-stroke racing machinery in its class.
Homologation:
Likely homologated for various racing series, with specific approvals varying by region and class rules.
