Contents

- GENERAL INFORMATION
  - SAFETY INFORMATION
  - LOCATION OF IMPORTANT LABELS
  - DESCRIPTION
  - IDENTIFICATION
  - INCLUDED PARTS
  - IMPORTANT INFORMATION
  - BASIC SERVICE INFORMATION
  - SPECIAL TOOLS
  - INSTRUMENT AND 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
  - 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
  - LUBRICATION SYSTEM CHART AND DIAGRAMS
  - ENGINE REMOVAL
  - CAMSHAFT
  - CYLINDER HEAD
  - VALVES AND VALVE SPRINGS
  - CYLINDER AND PISTON
  - GENERATOR
  - STARTER CLUTCH
  - ELECTRIC STARTER
  - CLUTCH
  - SHIFT SHAFT
  - OIL PUMP
  - CRANKCASE
  - CRANKSHAFT AND BALANCER SHAFT
  - TRANSMISSION
- COOLING SYSTEM
  - COOLING SYSTEM DIAGRAMS
  - RADIATOR
  - WATER PUMP
- FUEL SYSTEM
  - FUEL TANK
  - THROTTLE BODY
- ELECTRICAL SYSTEM
  - IGNITION SYSTEM
  - ELECTRIC STARTING SYSTEM
  - CHARGING SYSTEM
  - SIGNALING SYSTEM
  - FUEL INJECTION SYSTEM
  - FUEL PUMP SYSTEM
  - ELECTRICAL COMPONENTS
- TROUBLESHOOTING
  - TROUBLESHOOTING
  - SELF-DIAGNOSTIC FUNCTION AND DIAGNOSTIC CODE TABLE
- TUNING
  - CHASSIS
- WIRING DIAGRAM

Yamaha YZ450FXM YZ450FX 2021 Owner's Manual

Yamaha YZ450FXM YZ450FX 2021 manual cover

Pages 374

Year 2021

Language(s)

of 374

Yamaha YZ450FXM YZ450FX 2021 Specification

The Yamaha YZ450FXM YZ450FX 2021 is a high-performance off-road motorcycle engineered for cross-country racing and trail riding. It is powered by a 449cc liquid-cooled, DOHC four-stroke engine, delivering robust performance with seamless power delivery. The bike features Yamaha's proprietary Power Tuner app, which allows riders to fine-tune the engine mapping wirelessly via a smartphone, ensuring optimal performance across various terrains and conditions.

The chassis is crafted from lightweight aluminum, providing a perfect balance of stiffness and flex for superior handling and stability. It is equipped with a KYB speed-sensitive front suspension system and a fully adjustable rear shock, both designed to offer excellent response and control over rough terrain. The bike's compact, centralized mass contributes to its agile handling and precise cornering capabilities.

The YZ450FXM YZ450FX 2021 comes with a wide-ratio five-speed transmission, optimized for a broad range of off-road conditions, from tight trails to open tracks. The electric start system, powered by a high-capacity lithium-ion battery, ensures quick and reliable starting in all conditions. The bike also includes an 18-inch rear wheel and a 21-inch front wheel, both fitted with off-road-specific tires for enhanced traction and durability.

The ergonomics of the YZ450FX have been designed with rider comfort and control in mind, featuring a flat seat profile, slim bodywork, and strategically placed handlebar mounts. The fuel tank has a capacity of 2.15 gallons, offering a good balance between range and weight distribution. Advanced braking components, including wave-style rotors and high-performance calipers, provide strong and consistent stopping power.

In summary, the Yamaha YZ450FXM YZ450FX 2021 is a versatile and powerful off-road bike, equipped with advanced technology and engineering to meet the demands of serious riders and racers.

Yamaha YZ450FXM YZ450FX 2021 F.A.Q.

What type of fuel is recommended for the Yamaha YZ450FX 2021?

Yamaha recommends using unleaded gasoline with a minimum octane rating of 91 (RON) for optimal performance and engine health.

How often should I change the oil in my Yamaha YZ450FX 2021?

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

What is the correct tire pressure for the Yamaha YZ450FX 2021?

The recommended tire pressure is 15 psi (103 kPa) for both the front and rear tires. Adjust the pressure according to the terrain and riding conditions.

How do I adjust the suspension on my Yamaha YZ450FX 2021 for different terrains?

To adjust the suspension, use the suspension clickers located on the forks and shock. For softer terrain, reduce compression damping and increase rebound damping. For harder terrain, increase compression and reduce rebound damping.

What should I do if my Yamaha YZ450FX 2021 won't start?

Check the fuel supply, ensure the battery is charged, inspect the spark plug for fouling, and verify that the kill switch is not engaged. If the problem persists, consult a professional technician.

How often should the air filter be cleaned on the Yamaha YZ450FX 2021?

Clean the air filter every 2 to 3 rides or more frequently in dusty conditions. A clean air filter ensures proper air flow and engine performance.

What is the recommended chain tension for the Yamaha YZ450FX 2021?

The recommended chain slack is 30-40 mm. Adjust the chain tension by loosening the axle nut and turning the adjuster bolts equally on both sides.

How do I perform a basic maintenance check on my Yamaha YZ450FX 2021 before a ride?

Check tire pressure, inspect brakes and throttle for proper function, ensure the chain is lubricated and properly tensioned, and verify fluid levels such as oil and coolant.

What is the break-in procedure for a new Yamaha YZ450FX 2021?

For the first 1 hour, avoid prolonged full-throttle operation and vary the engine speed. Change the oil and filter after the initial break-in period to remove any contaminants.

How can I improve the fuel efficiency of my Yamaha YZ450FX 2021?

To improve fuel efficiency, maintain a clean air filter, ensure the correct tire pressure, perform regular maintenance, and ride at moderate speeds.