🏷️ Basic Information

Make:

Yamaha

Model:

YZ125

Year:

1996

Product Name:

Yamaha YZ125 YZ 125 1996 96 Service Repair Workshop Manual

Country Of Origin:

Japan

Vehicle Type:

Motocross Motorcycle

👋 Introduction

Category:

High-performance Motocross Motorcycle

Target Audience:

Motocross racers, off-road enthusiasts, mechanics.

Key Competitors Era:

Honda CR125R, Kawasaki KX125, Suzuki RM125.

Performance Focus:

Lightweight design, powerful two-stroke engine, advanced suspension for competitive riding.

Design Philosophy:

Yamaha's commitment to creating agile and potent motocross machines.

📋 Manual Details

Engine:

Yes

Transmission:

Yes

Suspension:

Yes

Brakes:

Yes

Electrical System:

Yes

Chassis:

Yes

Bodywork:

Yes

Troubleshooting:

Yes

Maintenance:

Yes

Rebuilds:

Yes

Estimated Pages:

300-400

Type:

Service Repair Workshop Manual

Language:

English

Format:

Digital (PDF)

📖 Manual Coverage

Engine Mechanical:

Top-end overhaul (cylinder, piston, rings), bottom-end rebuild (crankshaft, connecting rod, bearings), valve timing, lubrication system, cooling system (if applicable), decarbonization.

Fuel System:

Carburetor disassembly, cleaning, adjustment, and rebuilding; fuel lines, fuel pump (if applicable).

Ignition System:

CDI unit, ignition coil, spark plug specifications, timing checks, stator and rotor.

Transmission Drivetrain:

Clutch operation, inspection, and adjustment; gearbox disassembly and reassembly, gear inspection, shift drum and forks, final drive chain and sprockets.

Suspension System:

Front fork (KYB/Sachs) disassembly, inspection, seal replacement, oil type and level, spring preload adjustment; rear shock absorber (Monoshock) service, linkage maintenance, damper adjustments.

Braking System:

Front and rear disc brake service, caliper inspection and rebuilding, brake pad replacement, hydraulic system bleeding, master cylinder and slave cylinder.

Electrical System:

Wiring diagrams, lighting system, horn, battery maintenance, charging system (if applicable), switchgear.

Cooling System:

Radiator inspection, coolant type and capacity, thermostat operation (if applicable).

Frame Chassis:

Frame inspection for damage, steering head bearing service, swingarm pivot bearing maintenance.

Wheels Tires:

Wheel bearing inspection, spoke tensioning, tire pressure specifications, rim specifications.

Preventive Maintenance:

Regular checks, lubrication points, filter replacement intervals, general tune-ups.

Diagnostic Procedures:

Step-by-step troubleshooting guides for common performance issues, starting problems, and component failures.

Disassembly Reassembly:

Detailed instructions for the removal and installation of all major components and sub-assemblies.

Torque Specifications:

Precise torque values for all critical fasteners, ensuring proper assembly and preventing component damage.

Adjustments:

Carburetor idle and mixture, clutch cable, throttle cable, brake levers.

Special Tool Requirements:

Identification of any Yamaha-specific or specialized tools needed for certain repairs.

Depth:

Comprehensive from basic rider maintenance to full engine and transmission rebuilds, including advanced troubleshooting.

📊 Manual Specifications

File Type:

PDF

Searchable Text:

Yes

Printable:

Yes

Resolution:

High-resolution images and diagrams

Binding:

N/A (Digital Download)

Paper Quality:

N/A (Digital Download)

⚙️ Engine Specifications

Type:

2-stroke, single-cylinder, reed valve induction

Displacement:

124 cc

Bore X Stroke:

56 mm x 50.7 mm

Cooling System:

Liquid-cooled

Compression Ratio:

8.7:1 (approx.)

Carburetor:

Mikuni VM28SS

Horsepower:

Approx. 38-40 HP (at crank, estimated)

Torque:

Not officially published, but significant for its class.

Fuel Type:

Unleaded gasoline with 2-stroke oil mix (typically 40:1 ratio)

Fuel Tank Capacity:

8.0 Liters (2.1 US gal)

🔧 Transmission

Type:

6-speed constant mesh

Clutch:

Wet, multiple disc

Gear Ratios:

Specific ratios available in manual, crucial for performance tuning.

Final Drive:

Chain drive, O-ring sealed

📐 Dimensions

Length:

Approx. 2170 mm (85.4 in)

Width:

Approx. 825 mm (32.5 in)

Height:

Approx. 1275 mm (50.2 in)

Wheelbase:

Approx. 1475 mm (58.1 in)

Ground Clearance:

Approx. 355 mm (14.0 in)

Dry Weight:

Approx. 93 kg (205 lbs)

Wet Weight:

Not specified, but typically higher than dry weight.

🛡️ Safety Features

Crash Safety:

Not applicable to this type of vehicle in the same way as road cars.

Braking System:

Hydraulic disc brakes front and rear for effective stopping power.

Handlebar Design:

Designed for control and shock absorption during off-road riding.

💡 Technology Features

Features:

Not applicable (basic motocross motorcycle).

Features:

Not applicable (basic motocross motorcycle).

Features:

Not applicable (basic motocross motorcycle).

🔧 Maintenance

Oil Change:

2-stroke pre-mix, requires periodic gearbox oil change as per manual.

Air Filter Cleaning:

Frequent cleaning recommended, especially after dusty rides.

Spark Plug Replacement:

As per manual recommendation, typically based on hours of use or specific wear indicators.

Top End Rebuild:

Recommended after a certain number of racing hours (e.g., 20-40 hours for piston, 40-80 hours for full rebuild), as detailed in the manual.

Gearbox Oil:

Yamalube 10W-40 API GL-4 or equivalent (check manual for exact specification).

Coolant:

High-quality motorcycle coolant (ethylene glycol-based) with distilled water, typically a 50/50 mix.

Brake Fluid:

DOT 4 hydraulic brake fluid.

Fork Oil:

Specific viscosity and volume as per manual, e.g., Showa SS-03 or equivalent.

Common Wear Items:

Piston rings, clutch plates, wheel bearings, steering head bearings, suspension seals, chain and sprockets.

Potential Failures:

Premature wear on the power valve due to carbon buildup, connecting rod bearing failure if lubrication is inadequate or contamination occurs.

Maintenance Importance:

Regular and diligent maintenance is critical for the longevity and performance of high-strung 2-stroke motocross engines.

📚 Vehicle History

Heritage:

Yamaha has a long-standing reputation for building high-performance motorcycles, particularly in the motocross and off-road segments.

Yz Series History:

The YZ line has been a cornerstone of Yamaha's motocross efforts, consistently evolving to meet the demands of competitive racing. The 1996 model represents a key step in its development.

1996 Updates:

The 1996 YZ125 likely featured chassis and suspension refinements over previous models, aiming for improved handling and rider comfort, often incorporating lessons learned from racing.

Production Period:

1974-present (YZ125 model line).

Manufacturing Location:

Japan, and potentially other Yamaha global facilities.

🏆 Awards & Recognition

Motocross Performance:

The YZ125 has historically been a competitive machine in its class, often recognized for its strong performance and handling characteristics in motocross racing reviews and championships.

Review Sentiment:

Generally positive reviews during its production era, praised for its power-to-weight ratio and agile chassis.

Emissions:

Not subject to the same emissions certifications as road-legal vehicles.