NEW FOR 2015

• Black wheels (blue model)
• Gold chain (blue model)
• 1/4 turn fasteners on the air box
• New fork internal settings
• Only manufacturer with 2 color options
• Available June
• $7,490 (tentative)

2015 YZ250F FEATURES & BENEFITS

NEW! New front fork settings offer greater performance in the mid-to-end stroke.
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NEW! Quick-release quarter-turn Dzus air box fasteners for tool-less access to the air filter.

YZ250F ENGINE:

A liquid-cooled, DOHC 4-valve, fuel-injected engine with the same forward-positioned straight intake, rear-inclined cylinder and rear-positioned exhaust layout as the YZ450F. The engine, with its straight and symmetrical intake and exhaust ports and compact, high-compression combustion chamber, delivers outstanding engine character in the high- speed range.
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The adjustable fuel injection system uses a 44mm throttle body fed by a high-pressure battery-less electric fuel pump. This ensures optimum fuel atomization and air/fuel calibration for excellent rideability in a wide range of riding conditions. The system controls the volume of fuel injected and the ignition timing based on engine rpm and throttle opening, providing hesitation-free response and controllability.
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Various detailed design measures are adopted to reduce horsepower loss. The forged 2-ring piston is lightweight and is cooled by an oil spray jet. In addition, the compression ring is a single-ring design instead of the conventional two ring. This piston and rings, along with the offset cylinder configuration, reduce friction loss and contribute to quick response. What’s more, the specs for the intake/exhaust ports, cam profiles, ECU, carburized crank, optimized balance ratios for the crank web, transmission, clutch design and other features, all work together to create the YZ250F’s outstanding engine character with power output in the high-rpm range.
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As with the YZ450F, an innovative exhaust pipe design is adopted to increase mass centralization and improve power development characteristics. This layout moves the rear end of the exhaust pipe farther forward and enables a muffler position close to the center of the mass. Adjustments are made in the pipe diameter in its various sections, resulting in excellent exhaust pulse effect that contributes to high rpm power output. The compact wet sump lubrication system with piston cooler spray jet maintains excellent engine durability and eliminates the need for an oil tank, which lowers engine weight. This creates a more compact engine that contributes to mass centralization and unmatched handling.
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The transmission and shift mechanisms reduce drive-force loss during gear changes and produce smoother shift operations and surer shift action.

YZ250F CHASSIS/SUSPENSION:

The aluminum muffler is positioned closer to the machine’s center of gravity as it is almost completely hidden by the side number plate. The layout contributes to centralized mass for a lightweight handling feeling.
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The front suspension has proven KYB® air-oil separated forks with stiffer fork springs, new valving and a new fork outer tube to improve performance in the mid-to-end stroke and aid fork bottoming resistance. The rear suspension also features settings optimized for ideal damping characteristics to match the chassis dimensions.
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The large-diameter 22mm front axle and top triple clamp increase rigidity for excellent handling and front-end feel. The handlebar mounts are rubber mounted to improve comfort and reduce handlebar vibration.
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The air filter is positioned away from the rear wheel, which means less maintenance for the rider.

YZ250F ADDITIONAL FEATURES:

“In-mold graphics” technology is a method in which the graphics are molded into the radiator shrouds for improved decal durability and reduced scratches.
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Riders have a choice of two color options: Team Yamaha Blue/ White or White/Red.