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
  - FUEL INJECTION SYSTEM
  - FUEL PUMP SYSTEM
  - ELECTRICAL COMPONENTS
- TROUBLESHOOTING
  - TROUBLESHOOTING
  - SELF-DIAGNOSTIC FUNCTION AND DIAGNOSTIC CODE TABLE
- TUNING
  - CHASSIS
- WIRING DIAGRAM

Yamaha YZ250FM YZ250F 2021 Owner's Manual

Pages 368

Year 2021

Language(s)

of 368

Yamaha YZ250FM YZ250F 2021 Specification

The Yamaha YZ250FM YZ250F 2021 is a high-performance motocross bike designed for competitive racing and advanced riders. It features a liquid-cooled, DOHC, 4-stroke, single-cylinder engine with a 250cc displacement, providing a robust power output and exceptional throttle response. The advanced fuel injection system ensures optimal fuel delivery, enhancing both performance and fuel efficiency. The bike is equipped with a 5-speed transmission, facilitating seamless gear transitions and maintaining optimal power delivery across various terrains.

The chassis is a bilateral beam frame constructed from aluminum, which offers a perfect balance between rigidity and flexibility, ensuring superior handling and stability. The suspension system includes a fully adjustable KYB® coil spring fork at the front and a KYB® shock with adjustable preload, rebound, and compression damping at the rear, enabling precise tunability for diverse track conditions.

Braking is handled by a hydraulic disc system with a 270mm front disc and a 245mm rear disc, providing reliable stopping power. The bike's ergonomics are optimized for rider comfort and control, featuring a flat seat design and adjustable handlebar positions. The lightweight construction and centralized mass contribute to the bike's agile handling characteristics.

The Yamaha YZ250FM YZ250F 2021 also incorporates advanced electronics, including a digital display for essential information and a handlebar-mounted switch for easy access to engine mapping adjustments. This allows riders to quickly adapt the bike's performance to suit different track conditions. Overall, the Yamaha YZ250FM YZ250F 2021 stands out as a technologically advanced and highly competitive motocross bike, built to deliver exceptional performance and rider satisfaction.

Yamaha YZ250FM YZ250F 2021 F.A.Q.

What type of fuel should I use for my Yamaha YZ250F 2021?

The Yamaha YZ250F 2021 is designed to run on unleaded gasoline with a minimum octane rating of 91 (R+M)/2. Always use fresh fuel to ensure optimal performance.

How often should I change the oil in my YZ250F 2021?

It is recommended to change the engine oil every 5-10 hours of riding or after every race. Always use high-quality, motorcycle-specific oil.

What is the recommended tire pressure for the YZ250F 2021?

The recommended tire pressure for the Yamaha YZ250F 2021 is 12 psi for the front tire and 12 psi for the rear tire. Adjust based on riding conditions and rider preference.

How do I properly clean and maintain the air filter on the YZ250F 2021?

Remove the air filter, clean it with a mild detergent, rinse it thoroughly, and let it dry completely. Apply a thin layer of air filter oil before reinstalling it.

What should I do if my YZ250F 2021 won't start?

First, check the fuel level and ensure the fuel is not stale. Verify that the spark plug is in good condition and that the battery is charged. If problems persist, consult a professional mechanic.

How can I adjust the suspension settings on my YZ250F 2021 for different terrains?

Refer to the owner’s manual for baseline suspension settings. Adjust the compression and rebound damping to suit different terrains, such as softening for rough terrain or stiffening for smoother surfaces.

What is the correct way to adjust the chain tension on the YZ250F 2021?

Ensure the chain has 30-40mm of slack at the midpoint. Loosen the axle nut, adjust the chain tension using the adjuster bolts, and re-tighten the axle nut to secure the setting.

How frequently should I inspect the brake system on my YZ250F 2021?

Inspect the brake pads, fluid level, and hoses before each ride. Replace any worn components immediately to maintain optimal braking performance.

What are the steps to winterize my YZ250F 2021?

Clean the motorcycle thoroughly, change the oil, drain the fuel system or add a fuel stabilizer, remove the battery and store it in a cool, dry place, and cover the bike to protect it from dust and moisture.

How can I improve the performance of my YZ250F 2021?

Regular maintenance, using high-quality fuel and oil, and installing performance parts such as an aftermarket exhaust or air filter can enhance the performance of your YZ250F 2021.