Contents

- GENERAL INFORMATION
  - LOCATION OF IMPORTANT LABELS
  - DESCRIPTION
  - CONSUMER INFORMATION
  - INCLUDED PARTS
  - IMPORTANT INFORMATION
  - CHECKING OF CONNECTION
  - SPECIAL TOOLS
  - CONTROL FUNCTIONS
  - STARTING AND BREAK-IN
  - TORQUE-CHECK POINTS
  - MAINTENANCE AFTER BREAK-IN
  - CLEANING AND STORAGE
- SPECIFICATIONS
  - GENERAL SPECIFICATIONS
  - MAINTENANCE SPECIFICATIONS
  - TIGHTENING TORQUES
  - CABLE ROUTING DIAGRAM
- REGULAR INSPECTION AND ADJUSTMENTS
  - MAINTENANCE INTERVALS
  - PRE-OPERATION INSPECTION AND MAINTENANCE
  - ENGINE
  - CHASSIS
  - ELECTRICAL
- ENGINE
  - SEAT, FUEL TANK AND SIDE COVERS
  - EXHAUST PIPE AND SILENCER
  - RADIATOR
  - CARBURETOR AND REED VALVE
  - CYLINDER HEAD, CYLINDER AND PISTON
  - CLUTCH
  - KICK SHAFT AND SHIFT SHAFT
  - YPVS GOVERNOR
  - WATER PUMP
  - CDI MAGNETO
  - ENGINE REMOVAL
  - CRANKCASE AND CRANKSHAFT
  - TRANSMISSION, SHIFT CAM AND SHIFT FORK
- CHASSIS
  - FRONT WHEEL AND REAR WHEEL
  - FRONT BRAKE AND REAR BRAKE
  - FRONT FORK
  - HANDLEBAR
  - STEERING
  - SWINGARM
  - REAR SHOCK ABSORBER
- ELECTRICAL
  - ELECTRICAL COMPONENTS AND WIRING DIAGRAM
  - IGNITION SYSTEM
- TUNING
  - ENGINE
  - CHASSIS

Yamaha YZ125L2, YZ125XL YZ125, YZ125X 2020 Owner's Manual

Yamaha YZ125L2, YZ125XL YZ125, YZ125X 2020 manual cover

Pages 240

Year 2020

Language(s)

of 240

Yamaha YZ125L2, YZ125XL YZ125, YZ125X 2020 Specification

The 2020 Yamaha YZ125L2, YZ125XL, YZ125, and YZ125X represent Yamaha's commitment to delivering high-performance off-road motorcycles. These models are powered by a 125cc liquid-cooled, two-stroke engine that ensures a blend of power and agility, making them ideal for competitive motocross and cross-country riding. The engine features Yamaha's Power Valve System (YPVS) that optimizes power delivery across the rev range.

Each model is equipped with a six-speed transmission that offers smooth and precise gear shifts, enhancing the overall riding experience. The chassis is constructed from lightweight aluminum, contributing to the bike's agility and ease of handling. The front suspension system consists of fully adjustable KYB® inverted forks, while the rear suspension employs a KYB® single shock with a fully adjustable linkage system, both designed to provide superior handling and comfort over rough terrain.

Braking performance is ensured by hydraulic disc brakes at both the front and rear, providing reliable stopping power. The bikes feature a 21-inch front wheel and an 18-inch rear wheel, fitted with high-traction tires for optimal performance on various surfaces. The ergonomics are designed for maximum rider comfort and control, with an adjustable handlebar position to accommodate different riding styles.

The fuel tank capacity stands at 2.1 gallons, offering a suitable range for extended riding sessions. The YZ125X variant is tailored for cross-country, with specific adjustments in suspension settings and a wide-ratio transmission for varied terrains. Overall, the 2020 Yamaha YZ125 series combines advanced engineering with practical design, catering to riders seeking a competitive edge in both motocross and cross-country disciplines.

Yamaha YZ125L2, YZ125XL YZ125, YZ125X 2020 F.A.Q.

What is the recommended oil type for the Yamaha YZ125L2?

The recommended oil type for the Yamaha YZ125L2 is Yamalube 2R or any high-quality 2-stroke engine oil.

How do I troubleshoot a starting issue on my Yamaha YZ125 2020?

Check the spark plug for fouling, ensure the fuel is fresh, verify the carburetor settings, and inspect the air filter for any obstructions.

What is the maintenance schedule for the Yamaha YZ125X?

Regular maintenance includes checking the oil level every ride, cleaning the air filter after every ride, and inspecting the brake pads and fluid every month. A full service is recommended every 20 hours of riding.

How do I adjust the chain tension on a Yamaha YZ125XL?

To adjust the chain tension, place the bike on a stand, loosen the axle nut, adjust the chain adjusters on both sides equally until the desired tension is achieved, then tighten the axle nut securely.

What tire pressure is recommended for the Yamaha YZ125?

The recommended tire pressure is 12 psi for the front tire and 12 psi for the rear tire, although adjustments may be made for different terrains.

How can I improve the suspension performance on my Yamaha YZ125X?

Consider adjusting the suspension settings to suit your weight and riding style. You may also upgrade to higher quality suspension components or have your current suspension tuned by a professional.

What should I do if my Yamaha YZ125L2 is overheating?

Ensure that the coolant level is sufficient, check for any leaks in the cooling system, and verify that the radiator is free from obstructions and debris.

How often should the spark plug be replaced on a Yamaha YZ125 2020?

The spark plug should be inspected every 6 hours of riding and replaced every 20 hours or sooner if it shows signs of wear or fouling.

What is the recommended break-in procedure for a new Yamaha YZ125XL engine?

During the first hour, avoid prolonged high RPM operation. Gradually increase the engine load and vary the throttle position. After the first hour, change the oil and check all bolts and fasteners for tightness.

How do I clean and maintain the air filter on a Yamaha YZ125X?

Remove the air filter, wash it with a mild detergent, rinse thoroughly, let it dry completely, apply air filter oil evenly, and reinstall it. Ensure the airbox is clean before reinstalling the filter.