2011 Yamaha YZ250F

Engine:

• The valve spring retainers are lightweight aluminum instead of steel, and valve spring pressure is lighter for reduced valve-opening force. This contributes to superior low-to-midrange torque characteristics due to less power-robbing friction. There’s also a higher lift cam profile, while valve stem ends are chromium-nitride coated for exceptional reliability and reduced maintenance.
• The exhaust port is “D” shaped instead of round. This increases velocity through the port for excellent throttle response, while enhancing the power feeling of the engine.
• The radiator is lower and further back and the oil tank is compact and repositioned to achieve greater mass centralization.
• The carburetor bore has a venturi shape, plus there’s recalibrated jetting and a accelerator pump. This translates to impressive response when the rider snaps open the throttle, and contributes to superb torquey low-to-midrange power characteristics.
• The intake boot offers a straight, smooth tract for excellent engine breathing and more power. The airbox is shaped to tuck neatly into the Bilateral Beam frame.
• The exhaust pipe has been carefully tuned to optimize engine power, with a muffler that’s 50mm longer and with a narrower core – a design that lets the YZ250F comfortably meet the latest noise standards without sacrificing power.
• Engineers were able to increase the clutch spring load for stronger engagement, yet, thanks to a recalibrated clutch actuation arm cam ratio, lever pull is actually lighter than before.
• Third and fourth gear ratios are slightly taller, and third, fourth, and fifth gears are stronger than ever with drive dog shapes for positive engagement. That gives riders a strong gearbox that’s been carefully matched to engine power characteristics.

Chassis/Suspension:

• The Bilateral Beam frame is crafted from a carefully chosen combination of forged and extruded aluminum pieces – 20 in all – all welded together to provide unmatched rigidity balance.
• The KYB® speed-sensitive front fork delivers exceptional damping feel, responsiveness, and bump absorption characteristics. The piston rods have a new surface treatment, and the oil seal is a new design.
• The 4-way-adjustable KYB® rear shock has been designed to make the most of the Bilateral Beam frame design. It’s lower in the frame for excellent mass centralization.
• The tank, seat, and rear fender are flat and the relationship between handlebars, pegs, and seat result in a natural, more forward riding position that facilitates rider movement. The fuel tank has been moved toward the center of the bike for mass centralization. The ProTaper® bars are four-way adjustable, and handlebar mounts and footpegs are 5mm higher to optimize rider position on the chassis.

Additional Features:

• Riders have a choice of two color options: Team Yamaha Blue and White or White and Red.

Available Accessories:

Please refer to the Yamaha Accessories & Apparel Catalog or go to yamaha-motor.com.
* Wet weight includes the vehicle with all standard equipment and all
fluids, including oil, coolant (as applicable) and a full tank of fuel. It does not include the weight of options or accessories. Wet weight is useful in making real-world comparisons with other models.