Contents

- GENERAL INFORMATION
  - LOCATION OF IMPORTANT LABELS
  - DESCRIPTION
  - IDENTIFICATION
  - FEATURES
  - INCLUDED PARTS
  - IMPORTANT INFORMATION
  - BASIC SERVICE INFORMATION
  - SPECIAL TOOLS
  - CONTROL FUNCTIONS
  - STARTING AND BREAK-IN
  - MAINTENANCE AFTER BREAK-IN
  - TORQUE-CHECK POINTS
  - CLEANING 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
  - KICKSTATER
  - 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 YZ250FF 2015

Yamaha YZ250FF 2015 Owner's Manual

Pages 358

Year 2015

Language(s)

of 358

Yamaha YZ250FF 2015 Specification

The Yamaha YZ250F 2015 is a high-performance motocross motorcycle engineered for competitive racing and advanced off-road handling. Powered by a robust 249cc, liquid-cooled, DOHC, four-stroke engine, it features a forward-positioned straight downdraft intake coupled with a symmetrical exhaust, optimizing power delivery and enhancing mid-to-high RPM performance. The engine is paired with a five-speed transmission, ensuring smooth and precise gear shifts under various riding conditions.

The chassis of the YZ250F 2015 is constructed from a bilateral beam aluminum frame, offering a balanced blend of rigidity and flexibility for improved handling and stability. The suspension system includes a fully adjustable KYB Speed-Sensitive System (SSS) front fork and a fully adjustable KYB rear shock, providing superior damping characteristics and the ability to fine-tune settings to match different terrains and rider preferences.

Ergonomically, the YZ250F 2015 is designed with a slim, lightweight profile that enhances rider mobility and control. It features a flat seat and compact fuel tank, allowing for easy weight transfer and maneuverability. The braking system includes a 270mm front disc brake and a 245mm rear disc brake, delivering strong and reliable stopping power.

In terms of aesthetics, the motorcycle sports aggressive styling and durable graphics, ensuring it stands out on the track while enduring the rigors of racing. Additionally, the YZ250F 2015 incorporates a high-capacity radiator with a ten-row core and a large-capacity coolant reservoir, maintaining optimal engine temperatures during intensive use.

Overall, the Yamaha YZ250F 2015 combines advanced engineering, top-tier components, and rider-focused design to deliver exceptional performance, reliability, and versatility for serious motocross enthusiasts.

Yamaha YZ250FF 2015 F.A.Q.

What is the recommended engine oil type and capacity for a 2015 Yamaha YZ250F?

The recommended engine oil for the 2015 Yamaha YZ250F is Yamalube 4-R or equivalent, with an oil capacity of approximately 1.1 liters (1.16 US qt) when changing the oil and filter.

How often should I perform valve clearance checks on my 2015 Yamaha YZ250F?

Valve clearance should be checked and adjusted every 20 hours of riding to ensure optimal engine performance and longevity.

What is the proper chain tension for the 2015 Yamaha YZ250F?

The chain slack should be adjusted to approximately 50-60 mm (2.0-2.4 inches) at the tightest point for proper tension.

How can I improve the suspension setup on my 2015 Yamaha YZ250F for trail riding?

For trail riding, consider softening the compression settings on both the front forks and rear shock. Adjust the rebound damping to your preference for a smoother ride over rough terrain.

What should I do if my 2015 Yamaha YZ250F won't start?

If the bike won't start, check the fuel supply, spark plug condition, and battery charge. Ensure the kill switch is in the 'Run' position and inspect the wiring for any loose or damaged connections.

How do I clean and maintain the air filter on my 2015 Yamaha YZ250F?

Remove the air filter and clean it with a mild detergent. Allow it to dry completely before applying a thin layer of air filter oil. Reinstall the filter carefully to avoid any gaps or misalignment.

What are the torque specifications for the 2015 Yamaha YZ250F's cylinder head bolts?

The cylinder head bolts should be torqued to 30 Nm (22 ft-lb) in a criss-cross pattern to ensure even pressure distribution.

How can I troubleshoot overheating issues on my 2015 Yamaha YZ250F?

Check the coolant level and inspect the radiator for blockages. Ensure the cooling fan is functioning correctly and not obstructed. Additionally, verify that the thermostat is operating properly.

What type of spark plug is recommended for the 2015 Yamaha YZ250F?

The recommended spark plug for the 2015 Yamaha YZ250F is the NGK CR8E or equivalent. Ensure it is gapped correctly to 0.7-0.8 mm (0.028-0.031 inch).

How do I properly store my 2015 Yamaha YZ250F during the off-season?

For off-season storage, clean the bike thoroughly, change the oil, and fill the tank with fresh fuel stabilized with a fuel additive. Store the bike in a cool, dry place and remove the battery, keeping it on a trickle charger.