Contents

- GENERAL INFORMATION
  - LOCATION OF IMPORTANT LABELS
  - DESCRIPTION
  - IDENTIFICATION
  - INCLUDED PARTS
  - IMPORTANT INFORMATION
  - BASIC SERVICE INFORMATION
  - SPECIAL TOOLS
  - CONTROL FUNCTIONS
  - STARTING AND BREAK-IN
  - MAINTENANCE AFTER BREAK-IN
  - TORQUE-CHECK POINTS
  - MOTORCYCLE CARE AND STORAGE
- SPECIFICATIONS
  - GENERAL SPECIFICATIONS
  - ENGINE SPECIFICATIONS
  - CHASSIS SPECIFICATIONS
  - ELECTRICAL SPECIFICATIONS
  - TIGHTENING TORQUES
  - LUBRICATION POINTS AND LUBRICANT TYPES
  - LUBRICATION SYSTEM CHART AND DIAGRAMS
  - CABLE ROUTING DIAGRAM
- PERIODIC CHECKS AND ADJUSTMENTS
  - MAINTENANCE INTERVALS
  - PRE-OPERATION INSPECTION AND MAINTENANCE
  - ENGINE
  - CHASSIS
  - ELECTRICAL SYSTEM
- CHASSIS
  - GENERAL CHASSIS
  - FRONT WHEEL
  - REAR WHEEL
  - FRONT BRAKE
  - REAR BRAKE
  - HANDLEBAR
  - FRONT FORK
  - STEERING HEAD
  - REAR SHOCK ABSORBER ASSEMBLY
  - SWINGARM
  - CHAIN DRIVE
- ENGINE
  - ENGINE REMOVAL
  - CAMSHAFT
  - CYLINDER HEAD
  - VALVES AND VALVE SPRINGS
  - CYLINDER AND PISTON
  - CLUTCH
  - KICKSTARTER
  - SHIFT SHAFT
  - OIL PUMP AND BALANCER GEAR
  - AC MAGNETO
  - CRANKCASE
  - CRANKSHAFT ASSEMBLY AND BALANCER SHAFT
  - TRANSMISSION
- COOLING SYSTEM
  - RADIATOR
  - WATER PUMP
- FUEL SYSTEM
  - FUEL TANK
  - THROTTLE BODY
- ELECTRICAL SYSTEM
  - IGNITION SYSTEM
  - CHARGING SYSTEM
  - FUEL INJECTION SYSTEM
  - FUEL PUMP SYSTEM
  - ELECTRICAL COMPONENTS
- TROUBLESHOOTING
  - TROUBLESHOOTING
  - LIST OF SELF-DIAGNOSTIC AND FAIL-SAFE ACTIONS
- TUNING
  - CHASSIS
- WIRING DIAGRAM

Yamaha YZ250FJ YZ250F 2018 Owner's Manual

Pages 346

Year 2018

Language(s)

of 346

Yamaha YZ250FJ YZ250F 2018 Specification

The Yamaha YZ250FJ YZ250F 2018 represents a pinnacle in motocross engineering, designed to deliver exceptional performance on the track. This model is powered by a liquid-cooled, DOHC, 250cc, 4-stroke engine that boasts advanced fuel injection for precise throttle response and optimal power delivery. The innovative engine design includes forward-positioned intake and rearward exhaust layout, enhancing the bike’s mass centralization and contributing to its agile handling characteristics. A high-compression piston combined with aggressive cam profiles ensures robust power across the rev range.

The chassis of the YZ250FJ features a bilateral beam aluminum frame, providing an ideal balance between rigidity and flex. This frame design works in conjunction with a fully adjustable KYB suspension system, comprising a speed-sensitive fork and a rear shock with both high- and low-speed compression damping. These components ensure superior handling and stability over varied terrain.

The braking system includes wave-style rotors for improved heat dissipation and braking performance, with a 270mm front disc and a 245mm rear disc. The bike is equipped with a multi-plate wet clutch and a 5-speed constant mesh transmission, ensuring smooth and reliable gear shifts under demanding conditions.

Ergonomically, the YZ250FJ is designed for rider comfort and control. The compact bodywork provides an excellent rider interface, while the flat seat and seamless fuel tank design allow for easy movement and weight distribution. The lightweight, 21-inch front and 19-inch rear wheels are fitted with high-performance tires to maximize grip and durability.

With a dry weight of approximately 231 pounds and a fuel capacity of 1.6 gallons, the Yamaha YZ250FJ YZ250F 2018 is engineered to be a competitive and reliable choice for motocross enthusiasts, delivering top-tier performance, handling, and durability.

Yamaha YZ250FJ YZ250F 2018 F.A.Q.

What is the recommended engine oil type for the Yamaha YZ250FJ YZ250F 2018?

The recommended engine oil type for the Yamaha YZ250FJ YZ250F 2018 is a 4-stroke motorcycle oil with a viscosity of 10W-40 that meets or exceeds the JASO MA standard.

How often should I change the oil on my Yamaha YZ250FJ YZ250F 2018?

It is recommended to change the engine oil every 10 hours of riding or after a significant ride to ensure optimal performance and longevity of the motorcycle.

What is the correct tire pressure for the Yamaha YZ250FJ YZ250F 2018?

The recommended tire pressure for the Yamaha YZ250FJ YZ250F 2018 is 15 psi for both the front and rear tires. However, adjust according to terrain and riding conditions.

How do I adjust the suspension settings on a Yamaha YZ250FJ YZ250F 2018?

To adjust the suspension, use the clicker adjustments located on the top and bottom of the forks and the shock absorber. Refer to the owner’s manual for starting settings and adjust according to your weight and riding style.

What spark plug is recommended for the Yamaha YZ250FJ YZ250F 2018?

The recommended spark plug for the Yamaha YZ250FJ YZ250F 2018 is the NGK CR8E, which should be checked and replaced as necessary to maintain engine efficiency.

How can I troubleshoot starting issues with my Yamaha YZ250FJ YZ250F 2018?

Check the fuel supply, battery charge, and spark plug condition. Ensure that the kill switch is not engaged and the bike is in neutral. If issues persist, consult a professional mechanic.

What maintenance is required for the air filter on the Yamaha YZ250FJ YZ250F 2018?

The air filter should be cleaned every 10 hours of riding. Remove the filter, clean it with a suitable cleaner, dry it completely, and reapply a light coat of air filter oil before reinstalling.

How do I adjust the chain tension on the Yamaha YZ250FJ YZ250F 2018?

To adjust the chain tension, loosen the axle nut and use the chain adjusters to achieve 1.2-1.6 inches (30-40 mm) of slack at the midpoint of the chain. Retighten the axle nut securely.

What is the fuel capacity of the Yamaha YZ250FJ YZ250F 2018?

The fuel tank capacity of the Yamaha YZ250FJ YZ250F 2018 is approximately 1.6 gallons (6.1 liters), which should be sufficient for most riding conditions.

How do I perform a basic inspection before riding the Yamaha YZ250FJ YZ250F 2018?

Perform a basic inspection by checking the tire pressure, brake function, chain tension, oil level, and coolant level. Ensure all bolts are tightened, and the controls operate smoothly.