Contents

- GENERAL INFORMATION
  - DESCRIPTION
  - MACHINE IDENTIFICATION
  - INCLUDED PARTS
  - IMPORTANT INFORMATION
  - CHECKING OF CONNECTION
  - SPECIAL TOOLS
  - CONTROL FUNCTIONS
  - STARTING AND BREAK-IN
  - TORQUE-CHECK POINTS
  - CLEANING AND STORAGE
- SPECIFICATIONS
  - GENERAL SPECIFICATIONS
  - MAINTENANCE SPECIFICATIONS
  - TIGHTENING TORQUES
  - LUBRICATION DIAGRAMS
  - CABLE ROUTING DIAGRAM
- REGULAR INSPECTION AND ADJUSTMENTS
  - MAINTENANCE INTERVALS
  - PRE-OPERATION INSPECTION AND MAINTENANCE
  - ENGINE
  - CHASSIS
  - ELECTRICAL
- ENGINE
  - SEAT, FUEL TANK AND SIDE COVERS
  - EXHAUST PIPE AND SILENCER
  - RADIATOR
  - CARBURETOR
  - CAMSHAFTS
  - CYLINDER HEAD
  - VALVES AND VALVE SPRINGS
  - CYLINDER AND PISTON
  - CLUTCH
  - OIL FILTER ELEMENT AND WATER PUMP
  - BALANCER
  - OIL PUMP
  - KICK SHAFT AND SHIFT SHAFT
  - CDI MAGNETO
  - ENGINE REMOVAL
  - CRANKCASE AND CRANKSHAFT
  - TRANSMISSION, SHIFT CAM AND SHIFT FORK
- CHASSIS
  - FRONT WHEEL AND REAR WHEEL
  - FRONT BRAKE AND REAR BRAKE
  - FRONT FORK
  - HANDLEBAR
  - STEERING
  - SWINGARM
  - REAR SHOCK ABSORBER
- ELECTRICAL
  - ELECTRICAL COMPONENTS AND WIRING DIAGRAM
  - IGNITION SYSTEM
  - THROTTLE POSITION SENSOR SYSTEM
- TUNING
  - ENGINE
  - CHASSIS

Yamaha YZ250FX 2008 Owner's Manual

Pages 276

Year 2008

Language(s)

of 276

Yamaha YZ250FX 2008 Specification

The Yamaha YZ250FX 2008 is a high-performance off-road motorcycle designed for enduro and cross-country racing. It features a liquid-cooled, 4-stroke, DOHC, 5-valve engine with a displacement of 249cc, delivering robust power and torque suitable for competitive racing. The engine is paired with a 5-speed wide-ratio transmission, ensuring optimal power delivery and control across various terrains. The bike's frame is constructed from lightweight aluminum, providing a balance of strength and agility, which enhances maneuverability and handling in challenging conditions.

The YZ250FX is equipped with fully adjustable suspension systems, including a KYB speed-sensitive front fork and a fully adjustable rear shock, allowing riders to fine-tune the bike's performance based on their preferences and the terrain. The braking system features powerful disc brakes on both the front and rear wheels, ensuring reliable stopping power under all conditions.

The ergonomics of the YZ250FX are designed for rider comfort and control, featuring a slim seat, adjustable handlebar positions, and a compact fuel tank that aids in centralizing mass for improved stability. The bike's wheels are fitted with durable, off-road-specific tires designed to provide maximum traction and durability on rough surfaces.

Additional features include a digital enduro computer that provides essential information such as speed, trip distance, and maintenance intervals, enhancing the rider's ability to manage their journey effectively. The Yamaha YZ250FX 2008 is built to meet the demands of serious off-road enthusiasts, combining advanced engineering with practical design elements to deliver a reliable and high-performance racing machine.

Yamaha YZ250FX 2008 F.A.Q.

What type of oil is recommended for the Yamaha YZ250FX 2008?

For the Yamaha YZ250FX 2008, it is recommended to use a high-quality 10W-40 or 10W-50 4-stroke motorcycle oil that meets or exceeds the JASO MA standard.

How often should the air filter be cleaned or replaced?

The air filter should be inspected after every ride in dusty conditions and cleaned every 3-5 rides. Replace it if it shows signs of damage or if it cannot be cleaned effectively.

What is the correct spark plug gap for the YZ250FX 2008?

The correct spark plug gap for the Yamaha YZ250FX 2008 is 0.024-0.028 inches (0.6-0.7 mm).

How can I troubleshoot starting issues with my YZ250FX 2008?

If you're experiencing starting issues, check the battery charge, inspect the spark plug for fouling, ensure the fuel is fresh, and verify that the air filter is clean. Additionally, check the kill switch and wiring connections.

What is the recommended tire pressure for optimal performance?

The recommended tire pressure for the Yamaha YZ250FX 2008 is typically around 12 psi for both front and rear tires, but this can vary based on terrain and rider preference.

How do I properly adjust the suspension on the YZ250FX 2008?

To adjust the suspension, start by setting the sag with the rider on the bike. Adjust the compression and rebound settings to your preference, based on riding conditions and personal comfort, referring to the owner's manual for guidance.

What maintenance should be performed after every ride?

After every ride, clean the bike, inspect the air filter, check the chain tension and lubrication, inspect tires for damage, and check fluid levels including oil and coolant.

How do I change the coolant in the Yamaha YZ250FX 2008?

To change the coolant, ensure the engine is cool, remove the radiator cap, drain the coolant by removing the drain bolt, and then refill with a 50/50 mix of antifreeze and distilled water. Bleed the system of any air pockets.

What should I do if the clutch feels spongy or unresponsive?

If the clutch feels spongy, check the clutch cable for proper tension and signs of wear. Inspect the clutch lever and perch for damage or looseness. If hydraulic, bleed the system to remove air bubbles.

How can I improve the fuel efficiency of my YZ250FX 2008?

To improve fuel efficiency, ensure regular maintenance including air filter cleaning, proper spark plug gap, and chain lubrication. Riding smoothly and avoiding aggressive throttle use also helps.