2018 - 2019 Yamaha WR 250F

Make Model	Yamaha WR 250F
Year	2018 - 19
Engine	Four stroke, single cylinder, DOHC, 4 valve Titanium
Capacity	249 cc / 15.2 cu-in
Bore x Stroke	77 x 53.6 mm
Cooling System	Liquid cooled,
Compression Ratio	13.8:1
Lubrication	Wet sump
Induction	44 mm Keihin throttle body F.I.
Ignition	TCI: Transistor Controlled Ignition
Starting	Electric / Kick
Clutch	Wet, multiple
Transmission	6 Speed Wide ratio
Final Drive	#520 Chain
Primary Ratio	3.353 (57/17)
Secondary Ratio	3.923 (51/13)
Gear Ratio	1st 2.385 (31/13) 2nd 1.813 (29/16) 3rd 1.444 (26/18) 4th 1.143 (24/21) 5th 0.957 (22/23) 6th 0.815 (22/27)
Frame	Aluminium Bilateral Beam
Front Suspension	48 mm inverted fork, Adjustable
Front Wheel Travel	310 mm / 12.2 in
Rear Suspension	KYB Fully adjustable single shock
Rear Wheel Travel	315 mm / 12.4 in
Front Brakes	Single 270mm floating wave disc 2 piston caliper
Rear Brakes	Single 245mm disc 1 piston caliper
Front Tyre	80/100-21
Rear Tyre	100/100-18
Rake	27.0°
Trail	115 mm / 4.5 in
Dimensions	Length 2165 mm / 85.2 in Width 825 mm / 32.5 in Height 1280 mm / 50.4 in
Wheelbase	1,465 mm / 57.7 in
Seat Height	965 mm / 38.0 in
Ground Clearance	325 mm / 12.8 in
Wet Weight	117 kg / 258 lbs
Fuel Capacity	7.5 Litres / 2.0 gal

The DNA of the 2‑straight MX & SX Champ YZ250F in a light, great handling machine perfect for tight trails and woods. Rightfully wrong

At Yamaha we’ve always liked to do things our way. Being different is what makes our bikes so special. And when you take a look at the WR250F’s high-tech ‘reverse’ engine you can see that what may look wrong to some people is right for us!

The WR250F is a gamechanger. A front facing inlet and tuneable fuel-injection system deliver an instant hit of power. And by centralising mass, the under-seat fuel tank and top-mounted air box design give you ultra-light handling performance.

Featuring a 6-speed gearbox with a special enduro clutch and running with class-leading suspension, the electric-start WR250F is taking Yamaha back to the front.

CONQUER DIRT We’ve taken our revolutionary YZ four stroke motocross technology and applied it to the enduro world. Rearward slanted engine, reversed cylinder, forward mounted fuel injection and a compact chassis are just some of the key features found on the WR250F. Delivering light, agile handling on tight trails, the WR is also a great choice for the experienced recreational rider too.

PERFORMANCE The latest generation YZ250F engine is the inspiration for the WR power plant. A forward mounted 44 mm fuel injection system supplies fuel to the 4-valve cylinder head, while the wrap around exhaust removes the spent charge and centralizes mass at the same time. A couple of items you won’t find on a YZ250F is the WR’s 6-speed transmission, electric starting and radiator cooling fan. Key improvement for 2018 are revised engine internals and ECU which help round out this top performing off-roader.

The adjustable KYB suspension found on our WRs are considered by many to be the best in the business. Revised front and rear suspension settings provides better rider feedback to improve performance and handling. The chassis design centralizes mass for fast, accurate, and agile handling.

Yamaha are powering into the 2018 season with the latest WR250F and WR450F, two of the world’s most innovative and successful enduro bikes with a distinguished track record in EnduroGP and Enduro 2. Benefitting from some of the most advanced GP-developed engine and chassis technology, the WR250F and WR450F have the potential to take every rider into the victorYZone.

The WR-F’s unique reverse cylinder head layout features a front facing inlet and rear exiting exhaust that increase intake and exhaust efficiency, thereby enhancing the engine’s linear torque feeling. This innovative design delivers deep reserves of highly controllable and easy-to-use power, giving Yamaha WR450F and WR250F riders a real performance advantage.

The WR-F’s mass centralized design delivers high levels of agility for precise control over all types of terrain – and the advanced aluminium chassis with its class-leading suspension gives excellent handling performance and traction over rock, sand, grass, dirt and mud.

With class-leading durability and legendary Yamaha reliability as standard, the 2018 Yamaha WR450F and WR250F give you winning performance combined with a thrilling ride on any type of terrain.

The WR250F boasts a number of new features starting with its revolutionary rearward slanted, liquid-cooled, DOHC 4-stroke power plant with 4 titanium valves. A new cylinder head design with reshaped intake and exhaust ports matched to a new shorter intake funnel help to boost top end power, and new camshafts and valve springs were developed to further increase low to mid range power output.

The WR250F also receives a new lighter flat top piston design mated to a new shorter piston pin containing a DLC (diamond like carbon) coating to reduce friction and increase hardness.On the bottom end, the crank has adopted a new balance ratio and new nickel-chromoly steel connecting rod to produce broad, balanced, and predictable power while boosting reliability. These changes are regulated through a revised ECU that sends new 3-D mapping to the fuel injection system to optimise power output and engine feeling as well as improving the rev limiter. For a smoother clutch feeling the clutch push lever is redesigned, and to save weight, the kickstarter mechanism is removed.

Not stopping there, the same bilateral beam frame that is found on the winning YZ250F was added to the WR250F to improve handling. Featuring a central beam that’s 12mm wider at the widest point – as well as newly shaped steel engine brackets and repositioned foot pegs – the 2018 WR250F is an extremely strong and well balanced machine, offering precise handling combined with high stability to attack both technical and high-speed sections.