Target Audience:
Owners and mechanics seeking to maintain, repair, and restore Yamaha TZR 125 and DT 125R models from 1987-2002.
Value Proposition:
Provides essential technical information for DIY maintenance and repair, saving on dealership service costs.
Manual Utility:
Enables enthusiasts and professionals to perform a wide range of servicing tasks accurately.
Systems Covered:
Bodywork and fittings, Braking system, Cooling system, Electrical system, Exhaust, Fuel system, Clutch, Suspension, Wheels
Manual Type:
Service Repair Manual
Format:
Digital (Instant Download)
Engine Mechanical:
Detailed disassembly and assembly procedures for the engine, including cylinder, piston, crankshaft, connecting rod, and gearbox.
Fuel System Details:
Carburetor tuning, cleaning, and rebuilding; fuel tank inspection and cleaning; fuel line routing.
Cooling System Maintenance:
Radiator inspection, coolant type and capacity, water pump servicing, thermostat operation.
Electrical System Diagnostics:
Wiring diagrams, lighting system troubleshooting, ignition system components (CDI, spark plug), battery maintenance, charging system.
Braking System Overhaul:
Front and rear brake caliper servicing, brake pad replacement, brake fluid type and bleeding procedures, master cylinder inspection.
Suspension Setup And Repair:
Front telescopic forks servicing (oil changes, seal replacement), rear monoshock adjustment and rebuild, linkage inspection.
Wheel And Tire Care:
Tire pressure recommendations, wheel bearing inspection and replacement, spoke tensioning (for spoked wheels), rim maintenance.
Clutch Operation And Adjustment:
Clutch lever free play adjustment, clutch cable lubrication and replacement, clutch plate inspection.
Exhaust System Inspection:
Exhaust pipe sealing, muffler condition, gasket replacement.
Bodywork And Fittings Restoration:
Fairing removal and installation, seat maintenance, graphics and sticker application.
Routine Maintenance:
Oil changes, filter replacements, chain adjustment, spark plug checks, air filter cleaning/replacement.
Troubleshooting Guides:
Diagnostic procedures for common starting, running, and electrical issues.
Rebuild Instructions:
Detailed steps for rebuilding major components like the engine and transmission.
Component Replacement:
Step-by-step guides for replacing parts such as brake pads, clutch plates, and suspension seals.
Depth Of Coverage:
Comprehensive coverage from basic user maintenance to in-depth mechanical repairs and diagnostics.
File Format:
PDF (assumed, standard for digital downloads)
Print Quality:
High-resolution scans, optimized for clear viewing and printing of diagrams and text.
Binding Type:
Not Applicable (Digital Download)
Paper Type:
Not Applicable (Digital Download)
Engine Type:
2-stroke, liquid-cooled, single-cylinder
Bore X Stroke:
TZR 125: 56.4 mm x 50.0 mm; DT 125R: 56.4 mm x 50.0 mm (approximate, variations may exist)
Displacement:
124cc (approximate)
Compression Ratio:
TZR 125: 7.0:1 (approx.); DT 125R: 6.6:1 (approx.)
Power Output:
TZR 125: ~20-27 hp (varies by market/variant); DT 125R: ~17-22 hp (varies by market/variant)
Torque:
Specific torque figures are model-dependent and will be detailed within the manual.
Ignition System:
CDI (Capacitor Discharge Ignition)
Carburetor Type:
Mikuni VM Series (e.g., VM28 for TZR, VM26SS for DT, specific models vary)
Fuel Type:
Unleaded gasoline (minimum octane rating specified in manual, typically 91 RON or higher)
Oil Mixing:
Premix (ratio specified in manual, typically 50:1 or 100:1 with specific 2-stroke oil)
Length:
Model dependent; detailed specifications available in manual.
Width:
Model dependent; detailed specifications available in manual.
Height:
Model dependent; detailed specifications available in manual.
Dry Weight:
TZR 125: ~124 kg; DT 125R: ~117 kg (approximate, variations exist)
Instrument Cluster:
Analog speedometer, tachometer, odometer, and indicator lights for turn signals, high beam, neutral, and oil level.
Ypvs System:
Yamaha Power Valve System electronically controls exhaust port timing for optimized power delivery across the RPM range.
Oil Change Interval:
Refer to manual for specific intervals based on mileage or time (typically every 3,000-5,000 km for gearbox oil).
Spark Plug Replacement:
Recommended at intervals detailed in the manual (e.g., every 5,000-10,000 km, depending on plug type and usage).
Air Filter Cleaning:
Frequent cleaning recommended, especially for DT models used off-road (e.g., every 1,000-2,000 km or as needed).
Engine Oil Type:
High-quality 2-stroke motorcycle oil (specific API or JASO rating and recommended viscosity grade in manual, e.g., SAE 10W-40 or 20W-50 for gearbox).
Coolant Type:
Ethylene glycol-based coolant (50/50 mix with distilled water). Capacity specified in manual.
Brake Fluid Type:
DOT 4 or DOT 3 (verify in manual based on specific master cylinder).
Ypvs System Cleaning:
Carbon buildup in the YPVS system can affect performance; requires periodic cleaning and lubrication.
Carburetor Tuning:
Sensitivity to altitude and temperature changes often requires re-jetting or adjustment.
Cooling System Leaks:
Potential for leaks at hose connections or radiator due to age.
Clutch Wear:
Clutch plates can wear over time, leading to slippage; replacement intervals depend on riding style.
Engine Fasteners:
Crucial torque values for cylinder head, cylinder base, connecting rod, and main bearings are provided in the manual.
Wheel Fasteners:
Wheel axle nut torque, caliper mounting bolt torque, and other critical fastener torques are specified.
Yamaha Legacy:
Yamaha's long-standing reputation for performance and reliability in the motorcycle industry.
Tzr 125 Lineage:
The TZR 125 was Yamaha's sporty 125cc 2-stroke offering, often featuring YPVS (Yamaha Power Valve System) for improved powerband.
Dt 125R Legacy:
The DT 125R is an iconic dual-sport motorcycle known for its off-road capability and versatility.
Manufacturing Period:
1987-2002, with significant design updates occurring within this range.
