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Home / Offroad /Motocross / YZ250F

YZ250F

yamaha-yz250f

This is the bike that has totally revolutionised the 250 class. And dominated on racetracks around the globe. With its radical reverse cylinder head, rearward sloping cylinder and underseat fuel tank, the YZ250F is the way ahead for motocross design. 

Now to underline Yamaha’s policy of continuous development, we’ve made a range of technical improvements designed to keep the YZ250F on top. This high-tech motocross bike comes with an all-new high-performance reverse cylinder head that gives you the winning advantage. And with its re?ned aluminium frame and new suspension settings, you can run harder and faster from the gate to the ?ag.

So whether you’re an experienced pro racer or a hard-charging amateur, the revolutionary YZ250F delivers all the power and agility that you need to maximise your potential.

250cc liquid-cooled DOHC 4-valve engine

250cc liquid-cooled DOHC 4-valve engine


With its front facing inlet and rear exiting exhaust, the YZ250F's innovative reverse cylinder head offers many advantages over a conventional design. These include increased intake and exhaust efficiency, as well as enhanced mass centralisation thanks to the use of a top-mounted air filter and underseat fuel tank. Yamaha's engineers have taken this cutting-edge technology to the next level, and developed a new reverse cylinder head that gives the YZ250F rider even stronger mid to high rpm pulling power.

Aluminium bilateral beam frame

Aluminium bilateral beam frame


Using feedback from our factory teams, Yamaha has been able to fine-tune the frame in order to ensure that YZ250F riders are able to fully exploit the increased engine performance of the uprated model. Compared to the 2016 design, the 2017 frame is around 12mm wider in the area behind the swingarm pivot point, and this increased torsional rigidity ensures a higher degree of handling stability.

Air-Oil-Separate upside-down forks

Air-Oil-Separate upside-down forks


Increased rideability and comfort have been achieved on the 2017 YZ250F through a number of revisions to the front and rear suspension. The class-leading Air Oil Separate (AOS) KYB® front forks feature a new more rigid outer tube design and slightly reduced oil capacity, and these changes - together with new factory suspension settings - give improved rider feedback for improved chassis performance and stability in ruts, bumps and corners.

Improved ergonomics

Improved ergonomics


To achieve a roomier riding position that best suits a wide range of racers, the footrest position on the 2017 YZ250F has been lowered by 5mm. This also helps to lower the centre of gravity to give increased control in ruts and corners.

Improved stopping power

Improved stopping power


For improved brake feel, the 245mm rear disc is manufactured using the same heat resistant steel as the 270mm front disc, giving total braking confidence on the fastest tracks.

Easy access airbox

Easy access airbox


Quick release fastners on the airbox allows for easy access, to the large capacity air filter.

Mass centralisation

Mass centralisation


The muffler is moved forward. The exhaust pipe, which needs a certain length for good low and mid range torque, winds around the cylinder head like a snake, centralising weight.

Optional Power tuner

Optional Power tuner


Riders of all abilities can use the optional Yamaha Power Tuner to adjust the YZ250F's power characteristics. This compact device plugs straight into the bike without the need for a PC, and enables the rider or mechanic to fine-tune the engine performance in seconds to suit the track conditions.

Engine
 
Engine TypeLiquid cooled, 4-stroke, DOHC, 4-valve
Displacement (cc)250.0
Bore x Stroke (mm)77.0 x 53.6
Compression Ratio13.5 : 1
Lubrication SystemWet sump
Fuel ManagementFuel Injection
IgnitionTCI
Starter SystemKick
Fuel Tank Capacity (L)7.5
Final TransmissionChain
TransmissionConstant mesh 5-speed
 
Chassis
 
Frame TypeBilateral beam
Suspension FrontTelescopic forks, 310mm travel
Suspension RearSwingarm (link suspension), 315mm travel
Brakes FrontHydraulic single disc, 270mm
Brakes RearHydraulic single disc, 245mm
Tyres Front80/100-21 MS32 Tube type
Tyres Rear100/90-19 MS32 Tube type
 
Dimensions
 
Length (mm)2170
Width (mm)825
Height (mm)1280
Seat Height (mm)965
Wheelbase (mm)1475
Ground Clearance (mm)330
Wet Weight (kg)105