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 YZ450FXL1 YZ450FX 2020 Owner's Manual

Yamaha YZ450FXL1 YZ450FX 2020 manual cover

Pages 372

Year 2020

Language(s)

of 372

Yamaha YZ450FXL1 YZ450FX 2020 Specification

The Yamaha YZ450FXL1 YZ450FX 2020 is a high-performance off-road motorcycle designed to excel in cross-country and enduro racing. It features a potent 449cc liquid-cooled, DOHC four-stroke engine that delivers robust power and torque. The engine is equipped with Yamaha’s advanced fuel injection system, ensuring optimal performance under varying conditions.

The chassis of the YZ450FX is constructed from lightweight aluminum, providing a perfect balance of rigidity and flexibility. This contributes to superior handling and stability on rugged terrain. The bike boasts a class-leading KYB suspension system, with fully adjustable front forks and rear shock absorbers, allowing for precise tuning based on rider preference and track conditions.

Yamaha has integrated a wide-ratio, 5-speed transmission, specifically designed for off-road use, ensuring smooth gear transitions and enhanced control. The electric start system, combined with a high-capacity lithium-ion battery, ensures reliable starts under all conditions.

The YZ450FX is equipped with advanced electronics, including a handlebar-mounted switch for on-the-fly adjustments of engine mapping. The bike also features Yamaha’s Power Tuner app, which allows riders to customize engine performance settings via a smartphone.

The braking system comprises high-performance front and rear disc brakes, offering exceptional stopping power and control. The ergonomics of the YZ450FX are designed for rider comfort and control, with a tapered aluminum handlebar, adjustable foot pegs, and a flat seat profile.

Additionally, the YZ450FX comes with an 18-inch rear wheel and a robust 2.15-gallon fuel tank, providing the endurance needed for long rides. The bike's sleek, aggressive design is complemented by durable plastics and graphics that maintain their appearance over time. Overall, the Yamaha YZ450FXL1 YZ450FX 2020 stands out as a top-tier choice for serious off-road enthusiasts and competitive racers.

Yamaha YZ450FXL1 YZ450FX 2020 F.A.Q.

What type of fuel is recommended for the Yamaha YZ450FX 2020?

The Yamaha YZ450FX 2020 is designed to run on unleaded gasoline with a minimum octane rating of 91.

How often should I change the oil in my YZ450FX 2020?

It is recommended to change the oil every 5-10 hours of riding, depending on the conditions and intensity of use.

What is the correct tire pressure for the YZ450FX 2020?

The recommended tire pressure for the front tire is approximately 15 psi and for the rear tire is around 15 psi, but adjust according to terrain and rider preference.

How can I adjust the suspension settings on the Yamaha YZ450FX 2020?

The suspension settings can be adjusted using the clickers located on the forks and shock. Refer to the owner's manual for specific adjustment guidelines based on your weight and riding conditions.

What are common troubleshooting steps if the YZ450FX 2020 won't start?

Check the fuel level, ensure the kill switch is in the correct position, inspect the spark plug, and verify the battery charge. If the problem persists, consult a professional technician.

How do I clean and maintain the air filter on the YZ450FX 2020?

Remove the air filter, clean it with a suitable air filter cleaner, rinse with water, dry it completely, and apply air filter oil before reinstalling.

What is the spark plug gap specification for the YZ450FX 2020?

The spark plug gap for the Yamaha YZ450FX 2020 should be set to 0.8-0.9 mm.

How can I adjust the chain tension on my YZ450FX 2020?

To adjust the chain tension, loosen the axle nut, adjust the tension using the chain adjusters on both sides, and ensure the chain has the correct amount of slack before tightening the axle nut.

What type of coolant should be used in the Yamaha YZ450FX 2020?

Use a high-quality ethylene glycol-based coolant that is specifically designed for aluminum engines.

How do I reset the maintenance light on the YZ450FX 2020?

To reset the maintenance light, turn the ignition off, then press and hold the reset button while turning the ignition on until the light blinks and resets.