Engine:
* Liquid-cooled 250cc, five-titanium-valved, DOHC, four-stroke is powerful and
highly tractable, with an rpm redline for competition-crushing pulling power.
* 37mm Keihin FCR flat-slide carburetor with throttle position sensor (TPS) ensures
precise fuel/air mixing and lightning-quick throttle response.
* CDI ignition provides a hot, consistent spark across the powerband for right-now
throttle response.
* Lightweight, titanium header pipe (with titanium heat shield) flows into an
aluminum silencer for maximum power.
* Cylinder body and crankcase feature a large cutaway section to reduce pumping loss
and increase midrange performance.
* Primary kickstarting (with automatic decompression and convenient
handlebar-mounted hot start lever) ensures easy restarts.
* Slick, five-speed transmission with heavy-duty, multiplate clutch features an
involute spline setup, ensuring smooth shifting and instant hookup under power.
* Magnesium cylinder head cover helps shave weight.
* Trick, works-style clutch lever features race-spec barrel adjuster for on-the-fly
adjustability.


Chassis/Suspension:


* Extensively tested aluminum frame uses a mix of alloy castings, forgings and
extrusions to produce a tuned-flex frame that makes the YZ250F the best-handling bike in
its class.
* Speed-Sensitive System 48mm Kayaba fork places transfer control valves (TCV) above
the fork springs, so that damping force is controlled by piston speed: Eliminating
mid-stroke damping force changes provides a smoother, more precise ride.
* Titanium-sprung, four-way adjustable, rear shock with Kashima-coated internals
reduces friction for fantastic compliance and great handling.
* Removable aluminum rear subframe is constructed of square-section tubing for light
weight and easy maintenance.
* Lightweight front wheel hub for reduced unsprung weight and increased durability.
* Lightweight front and rear brake calipers with aluminum pistons and anti-bubble
front master cylinder; new wave-style rotors reduce unsprung weight and deliver strong
stopping power.
* Lightweight 21-inch front and 19-inch rear Excel rims are exceptionally durable
and reduce unsprung weight.


Additional Features:


* “Gripper” style seat cover offers excellent feel and control.
* ProTaper handlebar with durable, comfortable grips.


Engine :
Type : 250cc liquid-cooled DOHC 4-stroke; 5 titanium valves
Bore x Stroke : 77.0mm x 53.6mm
Compression Ratio: 13.5:1
Carburetion : FCR-MX37 x 1
Ignition : CDI
Transmission : Constant-mesh 5-speed; multiplate wet clutch
Final Drive : Chain Drive
Chassis :
Suspension/Front : Speed-Sensitive System inverted fork; fully adjustable, 11.8-in
travel
Suspension/Rear : Fully adjustable single shock; 12.0-in travel
Brakes/Front : Hydraulic single disc brake, 250mm
Brakes/Rear : Hydraulic single disc brake, 245mm
Tires/Front : 80/100-21-51M
Tires/Rear : 100/90-19-57M


Dimensions :


Length : 85.1 in
Width : 32.5 in
Height : 51.2 in
Seat Height : 38.8 in
Wheelbase : 57.8 in
Ground Clearance : 14.6 in
Dry Weight : 204 lb
Fuel Capacity : 1.8 gal