- Improved Engine Performance
- Smoother Engine Balance
- Slicker Gear Shifting
- Updated Bilateral Beam Aluminium Frame
- Newly Designed Multi-Function Meter
- Improved Front Brake with 270 mm front & 245 mm rear disc brakes
Other Key Features:
- MX Developed Features
- Sharp New Graphics
- 35-watt headlight & LED tail light
- Latest-generation YZ250F based rearward-slanting engine
- Electric starting
- YZ-based, fully adjustable KYB suspension
Liquid-cooled 250cc four-stroke, DOHC, 4-valve (titanium), single-cylinder engine
- With fuel injection produces strong mid- to high-range power.
- Tuned specifically for XC/woods racing with a broad, easy-to-use powerband and excellent power characteristics throughout the rev range.
Rearward-slanted, reversed cylinder design.
- rearward slant moves a significant amount of rotating weight toward the centre of the chassis
- rearward-slanted cylinder centralizes mass for excellent handling and a light, agile feel
"Reversed" engine design (FI system is front-mounted, exhaust exits from rear of cylinder).
- forward-mounted FI provides straight intake path into the cylinder and provides optimum fuel/ air filling and flow for excellent power
- front-mounted intake design keeps fuel cooler since engine heat has less effect on incoming fuel (cooler fuel is more dense and increases power)
- design also helps centralize mass for light, agile handling
Electric start with auto decompression system (no kick starter). Unit can be re-started in any gear.
- there is no main ignition switch on this model
- electric start button (RHS handlebar) activates the entire electrical system
- kill switch (LHS handlebar), if held for a few seconds, shuts down entire electrical system
Lightweight titanium valves and optimized valve springs.
- titanium valves reduce reciprocating weight and allow for a higher rpm limit before valve float
- titanium valves means a fast-revving engine with smooth power delivery
- 31 mm titanium intake valves and 25 mm titanium exhaust valves
Automatic cam chain tensioner.
- reduces maintenance
- special cam chain "sliders" reduce internal friction losses
Lightweight, short-skirt, forged aluminum piston.
- light flat-top piston features lateral ribs on both sides of the piston pin area
- single compression ring and specially designed oil control ring increases surface contact area for optimal sealing
- 2-ring design decreases sliding resistance, reduces weight and provides faster throttle response
Lightweight piston pin features a diamond-like coating (DLC) to reduce friction.
Piston oil cooler jet nozzle directs oil to the desired portion of the cylinder and underside of piston.
- reduces piston, cylinder and rod temperatures for excellent durability
"Liner-less" lightweight aluminum cylinder with ceramic composite coating.
- ceramic coating sprayed directly on the aluminum block, eliminating the need for a liner and reducing weight
- excellent heat dissipation for consistent power delivery
- coating enhances the thin film of oil between cylinder and piston, reducing friction and increasing power
Cylinder and crankcase "cutaways" allow air "trapped" under the piston to enter special chambers or cutaways.
- reduces horsepower-robbing "pumping losses"
- crankcase cutaways match cylinder cutaways for maximum efficiency
- bronze thrust washers located between crank webs and rod
- heat-treated for strength and durability
- balance ratio of the crank is optimized for minimal vibration and good torque feeling
Nickel-chromium-molybdenum connecting rod.
- excellent strength and durability
Lightweight, gear-driven counter balancer shaft.
- reduces vibration for improved rider comfort and less rider fatigue
6-speed transmission utilizes a 2-bar, floating shift guide system and a 14 mm shift shaft.
Heavy-duty, multi-plate clutch features a quick access magnesium outer cover.
- low-friction bushing on actuation arm reduces lever pull effort
- clutch is designed for the rigours of cross-country
- outer cover provides fast and easy clutch access
44mm Keihin throttle body fuel injection system.
- 10-hole injector
- maximizes fuel atomization for optimal combustion and excellent power delivery
- FI benefits include automatic adjustments to insure the optimum fuel - air ratio regardless of outside air temperature and altitude
- other benefits include excellent starting and excellent throttle response
- cold start knob also doubles as an idle adjuster
Handlebar-mounted engine trouble and low fuel warning lights.
Optional, GYTR competition ECU and GYTR Communication Control Unit (CCU) kit.
- Allows tailoring of both fuel injection and ignition mapping when used with Yamaha's free, exclusive Power Tuner app
- Monitor real-time data, track engine run time and run engine diagnostics
- Accurately log race data for future reference
- Share maps with friends and teammates
- Closed-course competition use only. Not for trail use
Forward-mounted air box features a washable, dual-stage, foam air filter.
- airbox cover features flush mounted quick release fasteners
- no tools required to access air filter
- washable foam filter reduces tune up costs
Wet sump lubrication system.
- reduces weight (no remote oil tank or oil lines)
- eases maintenance (easier and faster oil changes)
- oil volume is optimized to reduce oil related drag and weight
Easy access "cartridge-type" oil filter.
- large YZ250F-derived radiator features a cooling fan for consistent performance
- outstanding cooling efficiency
Maintenance-free transistor controlled ignition (TCI).
- produces a strong spark for fast starts
- provides precise ignition timing / mapping for optimum engine performance at all rpms
High-capacity AC magneto eliminates need for a battery.
Wrap-around exhaust system to match head, cam and intake.
- exhaust exits from the rear of the engine and circles cylinder body
- wrap-around design ensures the optimum tuned header length
- maximizes exhaust "pulse effect" for excellent power delivery
- centralizes mass by moving weight closer to the centre of the chassis
Lightweight, aluminum, re-packable muffler (aka silencer).
- sound output is 94 dB meeting AMA regulations
Works-style, race-spec "barrel adjuster" for on-the-fly clutch lever free play adjustments.
Heavy-duty plastic engine skid plate
Excessive lean angle sensor
- Will shut down the engine if the bike lays on its side
- helps prevent costly engine damage
Bilateral Beam Aluminium Frame
- The highly developed Control Fill aluminium bilateral beam frame taken from the class-leading YZ250F has been modified to match the more powerful engine and tuned for off-road performance.
- Centralizes mass for exceptional handling and agility
- Offers an optimum balance between strength, rigidity and tuned flex, plus excellent shock absorbing qualities
- Offers excellent rider-machine communication (a.k.a. feedback)
MX Developed Features
- As well as using the YZ250Fs engine and chassis as a platform, the MY22 WR250F also features the latest MX model’s footpegs, bars, bar holders, lightweight front axle and more to offer the full VictorYZone experience.
Lightweight, tapered aluminum swingarm.
- lightweight design reduces unsprung weight for excellent suspension performance
- excellent rear wheel traction and control
- large 25 mm rear axle
Lightweight detachable rear sub frame.
- constructed of square-section, lightweight aluminum pipe with no bends
- allows easy access when servicing rear suspension components
YZ250F-based, 48 mm, adjustable, inverted, Kayaba "SSS" cartridge fork offers 310 mm (12.2") of wheel travel.
- fork seal design features a scraper for better cleaning performance in muddy conditions
- valving and settings are optimized for cross-country racing
- front fork adjustments include: 20-way compression damping and 20-way rebound damping
- optional fork springs are available through Genuine Yamaha parts.
Fork features a twin-chamber, "Speed Sensitive System" design
- damper unit is in a separate structure (completely separated air and oil chambers)
- helps prevent aerated fork oil from entering the inner damper assembly and degrading its damping abilities
- since the inner damper is pressurized; it also eliminates bubbles forming in the oil
Fork also features a Transfer Control Valve (TCV).
- TCV enhances damping from mid to full stroke and improves bottoming characteristics
- TCV offers more precise control throughout the full suspension stroke
- TCV is located on the upside of the spring and its function is controlled by piston speed, not piston position, hence the term "Speed Sensitive System fork".
Large wrap-around plastic fork protectors provide excellent lower fork tube protection.
- self-supporting design reduces friction for smoother fork operation.
YZ250F-based, Monocross link rear suspension features a fully adjustable Kayaba piggyback shock with 317 mm (12.5") of wheel travel.
- valving and settings are optimized for cross-country racing
- shock features separate adjusters for high- and low-speed compression damping
- shock adjustments include: threaded spring preload, 20-way low-speed compression damping, 2 turns of high speed compression damping and 30-way rebound damping
Adjustable handlebar holders offer a total of 4 different handlebar positions with an adjustment range of 30 mm.
- suits wide variety of rider sizes
- handlebar holders are rubber mounted for reduced vibration and improved rider comfort
"Shorty-style" adjustable front brake lever can be adjusted to fit various hand sizes.
245 mm rear disc brake uses a "wave-style" disc and single piston Nissin caliper and Nissin master cylinder.
Rear caliper and lower portion of the disc are protected by heavy duty plastic protectors.
Lightweight, plastic resin 7.9-litre fuel tank is located under the seat.
- reduces centre of gravity and centralizes mass for exceptional handling performance
- tank can be flipped on its back without disconnecting fuel line (easy servicing under the tank)
- compact in-tank electric fuel pump
Handlebar-mounted engine trouble and low fuel warning lights
- minimizes weight and enhances the lightweight feel and look of the WR250F
- flat design, "minimal" bodywork allows for fast, easy rider movements and a natural riding position
- minimal design aids in keeping the body looking good (less plastic to scratch or damage)
- graphics are impregnated directly into the plastic rad shrouds and will not peel off or get damaged by pressure washing
Flat seat design.
- provides easy rider movements
- features a "cap cover" to access the fuel cap
- non-slip seat cover material resists clogging with dirt or mud
Rugged 21" (1.60 x 21) front and 18" (2.15 x 18) rear rims.
- excellent durability
- reduce unsprung weight for optimal suspension performance and handling
- 18" rear wheel improves puncture resistance (Vs. 19" designs)
Stylish, slim design 35 watt headlight.
Brilliant LED rear taillight.
- The meter features two modes: Standard and Race. Standard mode displays the speedometer, two trips meters and clock functions while Race mode features average speed, timer and trip functionality . The meter has integral low fuel and engine warning lights.
Rugged, plastic engine skid plate
Convenient oil level sight glass
Lightweight, extra wide foot pegs
Folding shift lever tip
Lightweight chain guide / support helps reduce chance of chain derailment & helps protect rear sprocket
Heavy-duty rubber swingarm protector (chain)
Heavy-duty sealed "O" ring drive chain
Easy access Yamaha Diagnostic tool connectors
Sealed, no-spill, gel type, low maintenance battery (battery should be charged during winter storage)