1998-2004 Yamaha YZ125 Cyclepedia Printed Motorcycle Service Manual


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Do you need to service a 1998-2004 Yamaha YZ125 motorcycle? The Cyclepedia Press LLC 1998-2004 Yamaha YZ125 printed service manual features detailed black and white photographs and wiring diagrams, complete specifications with step-by-step procedures performed and written by a professional Yamaha technician.

Buy the book and get 1 year of access to the Cyclepedia online manual, free!

The 1998-2004 Yamaha YZ125 Service Manual will help you repair the following motorcycles:

2004 Yamaha YZ125RS1
2003 Yamaha YZ125R
2002 Yamaha YZ125P
2001 Yamaha YZ125N1
2000 Yamaha YZ125M1
1999 Yamaha YZ125L1
1998 Yamaha YZ125K1

Table of Contents

Periodic Maintenance- Periodic Maintenance Chart, Clutch Cable Adjustment, Throttle Free Play, Engine Idle Speed, Drive Chain Adjustment, Brake Fluid, Brake Inspection, Transmission Oil, Spark Plug, Air Filter Servicing, Tires,

Quick Reference- Specifications, VIN and Engine Number Location, Torque Specifications

Cooling System- Coolant, Radiator, Water Pump

Fuel System- Carburetor Removal, Carburetor Installation, Carburetor Assembly, Carburetor Disassembly, Carburetor Specifications, Fuel Strainer, Airbox

External Components– Side Covers, Seat, Fuel Tank, Footpegs, Front Number Plate, Handlebar, Front Fender, Rear Fender, Exhaust System

Engine- Engine Specifications, Cylinder Head, Power Valve, Cylinder and Piston, Clutch, Magneto, Right Crankcase Cover, Gearshift, Primary Drive Gear, Reed Valve, Kick Starter, Engine Removal, Engine Installation, Crankcase Splitting, Crankcase Assembly, Crankshaft, Crankcase Bearings, Transmission Removal, Transmission Assembly, Five Speed Transmission, Six Speed Transmission

Final Drive- Drive Chain, Engine Sprocket, Rear Wheel Sprocket

Front Brake- Front Brake Master Cylinder, Front Brake Caliper

Rear Brake- Rear Brake Caliper, Brake Disc, Master Cylinder and Pedal

Wheels- Wheel and Axle Inspection, Front Wheel, Rear Wheel, Bearing Replacement

Steering- Steering

Front Suspension- Fork Removal and Installation, Front Fork, Specifications, Suspension Settings

Rear Suspension- Shock Absorber, Specifications, Swingarm Removal, Swingarm Installation,  Suspension Settings

Electrical System- Electrical Specifications, Ignition System, Wiring Diagrams

The Yamaha YZ125 is a popular motocross bike known for its agility and performance. It features a 125cc two-stroke engine that delivers impressive power for its size. This lightweight dirt bike is designed for off-road racing and provides riders with excellent maneuverability on various terrains.

When it comes to maintenance, regular upkeep is crucial to keep your Yamaha YZ125 in optimal condition. Here are some key maintenance tasks to consider:

  1. Oil Changes: Regular oil changes are essential to maintain proper engine lubrication and prevent excessive wear. Refer to the owner’s manual for recommended oil type and change intervals.
  2. Air Filter Cleaning/Replacement: The air filter should be cleaned or replaced regularly to ensure a clean air supply to the engine. Riding in dusty or muddy conditions may require more frequent air filter maintenance.
  3. Spark Plug Replacement: The spark plug should be inspected and replaced if necessary to ensure efficient combustion and reliable ignition. Follow the manufacturer’s recommendations for replacement intervals.
  4. Chain and Sprocket Maintenance: Keep the chain properly lubricated and adjust the tension as needed. Check the sprockets for wear and replace them if they show signs of significant wear or damage.
  5. Suspension Maintenance: The suspension system plays a crucial role in the bike’s handling and overall performance. Regularly check for leaks, and have the suspension components serviced or rebuilt when necessary.
  6. Brake Inspection: Ensure that the brake pads are in good condition and have sufficient thickness. Check the brake fluid level and replace it if it appears dirty or contaminated.
  7. Tire Maintenance: Check the tire pressure regularly and inspect the tires for any signs of damage or excessive wear. Replace tires that are worn beyond the recommended limits.
  8. General Inspections: Routinely inspect the bike for loose bolts, damaged cables, or any other signs of wear and tear. Address any issues promptly to avoid potential problems during rides.

It’s important to note that these are general maintenance guidelines. For detailed instructions and specific maintenance intervals, refer to the Yamaha YZ125 owner’s manual. Following the manufacturer’s recommendations will help ensure the longevity and performance of your Yamaha YZ125.

Additional information

Weight 3.5 lbs
Dimensions 13 × 12 × 2 in

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