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
  - ELECTRIC STARTER
  - CLUTCH
  - SHIFT SHAFT
  - OIL PUMP AND BALANCER GEAR
  - GENERATOR AND STARTER CLUTCH
  - CRANKCASE
  - CRANKSHAFT ASSEMBLY AND BALANCER SHAFT
  - TRANSMISSION
- COOLING SYSTEM
  - RADIATOR
  - WATER PUMP
- FUEL SYSTEM
  - FUEL TANK
  - THROTTLE BODY
- ELECTRICAL SYSTEM
  - IGNITION SYSTEM
  - ELECTRIC STARTING SYSTEM
  - CHARGING SYSTEM
  - SIGNALING SYSTEM
  - COOLING SYSTEM (For JPN)
  - FUEL INJECTION SYSTEM
  - FUEL PUMP SYSTEM
  - ELECTRICAL COMPONENTS
- TROUBLESHOOTING
  - TROUBLESHOOTING
  - LIST OF SELF-DIAGNOSTIC AND FAIL-SAFE ACTIONS
- TUNING
  - CHASSIS
  - KICKSTARTER KIT (OPTIONAL PARTS)
- WIRING DIAGRAM

Yamaha YZ450FXJ YZ450FX 2018 Owner's Manual

Yamaha YZ450FXJ YZ450FX 2018 manual cover

Pages 406

Year 2018

Language(s)

of 406

Yamaha YZ450FXJ YZ450FX 2018 Specification

The Yamaha YZ450FXJ YZ450FX 2018 is engineered to deliver top-notch performance and durability for off-road enthusiasts. This model is powered by a robust 449cc liquid-cooled DOHC 4-stroke engine, featuring a fuel injection system for precise throttle response and enhanced fuel efficiency. The engine is paired with a 5-speed wide-ratio transmission that ensures smooth and adaptable power delivery across various terrains.

The bike's chassis is constructed from a lightweight aluminum frame, optimized for agility and stability, which provides an excellent balance between rigidity and flexibility. The suspension system includes a fully adjustable KYB® coil spring fork at the front and a fully adjustable KYB® shock at the rear, designed to handle the rigors of off-road riding.

Braking is handled by a powerful hydraulic disc system, with a 270mm front disc and a 245mm rear disc, ensuring reliable stopping power. The YZ450FXJ YZ450FX 2018 is equipped with an 18-inch rear wheel and a 21-inch front wheel, both wrapped in durable knobby tires for superior traction on diverse surfaces.

Additional features include a compact and lightweight electric starter for convenience, along with a high-capacity radiator with a fan for optimal cooling under demanding conditions. The bike's ergonomics are designed to offer maximum comfort and control, with a tapered handlebar, adjustable footpegs, and a narrow seat profile. The fuel tank has a capacity of 2.1 gallons, allowing for extended riding sessions.

Overall, the Yamaha YZ450FXJ YZ450FX 2018 combines advanced engineering and thoughtful design to offer a versatile and high-performing off-road motorcycle, suitable for both competitive racing and recreational riding.

Yamaha YZ450FXJ YZ450FX 2018 F.A.Q.

What is the recommended oil type for the Yamaha YZ450FXJ 2018?

The recommended oil type for the Yamaha YZ450FXJ 2018 is Yamalube 4-Stroke Racing Oil or any high-quality 10W-40 motor oil suitable for wet clutches.

How often should I change the oil on my Yamaha YZ450FXJ?

It's recommended to change the oil every 10 hours of riding under normal conditions. If you ride in more extreme conditions, consider changing it more frequently.

Why is my Yamaha YZ450FXJ overheating?

Overheating can be caused by several factors, including low coolant levels, a clogged radiator, or a malfunctioning thermostat. Ensure that the cooling system is properly maintained and free of debris.

How do I adjust the suspension on my Yamaha YZ450FXJ for trail riding?

To adjust the suspension for trail riding, soften the compression and rebound damping to allow for a more comfortable ride over rough terrain. Refer to your manual for specific settings.

What maintenance should be performed before a race on the Yamaha YZ450FXJ?

Before a race, check the tire pressure, chain tension, brake function, and ensure all bolts are tightened. It's also important to inspect the air filter and oil levels.

How do I troubleshoot starting issues with the Yamaha YZ450FXJ?

If your bike won't start, check the battery charge, inspect the spark plug for wear, and ensure there is fuel in the tank. Verify the kill switch is in the correct position.

What is the correct tire pressure for the Yamaha YZ450FXJ?

The recommended tire pressure for the Yamaha YZ450FXJ is typically around 12 psi for both front and rear tires. Adjust based on terrain and rider preference.

How do I clean the air filter on my Yamaha YZ450FXJ?

Remove the air filter, gently wash it with a mild detergent, rinse thoroughly, and allow it to dry completely. Apply a light coat of air filter oil before reinstallation.

What should I do if my Yamaha YZ450FXJ stalls frequently?

Frequent stalling can be due to incorrect idle settings, a dirty carburetor, or clogged fuel lines. Check these components and adjust or clean as necessary.

How can I improve the fuel efficiency of my Yamaha YZ450FXJ?

To improve fuel efficiency, ensure regular maintenance like oil changes and air filter cleaning. Riding at a moderate pace and avoiding aggressive throttle use can also help.