ID # 14251549

2019 Yamaha YZ250FX

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Conquer Dirt

The high-flying, high-paced action of motocross is not for everyone. As a result, the slightly less intense world of cross country / hare scramble racing is a popular alternative. The YZ250FX is a cross-country-focused model with the performance potential of the YZ250F. If you are serious about winning, the YZ250FX could be the machine for you.


The YZ250FX uses the reversed-cylinder, rearward-slanted engine from the previous-gen YZ250F with modified fuel injection settings, electric start and a 6-speed transmission.

The Extras

Featuring a KYB speed-sensitive fork and fully adjustable KYB rear shock, the FX uses the same suspension as its MX cousin with softer settings and slightly more rear wheel travel. Also included is a lightweight aluminum side stand, adjustable handlebar and an 18-inch rear wheel. .

 Features & Benefits
  Key features for 2019
  • Latest-generation YZ250F-based, rear-slanting engine and bilateral beam chassis
  • Forward-mounted fuel injection and wraparound exhaust
  • Electric starting
  • YZ-based, fully adjustable KYB suspension
  • 18-inch rear wheel
  • Adjustable handlebar
  • GYTR Power Tuner compatible
  • "Reversed" liquid-cooled, 250 cc, DOHC, 4-valve (titanium), single-cylinder engine with fuel injection. The engine has been tuned for excellent rideability and controllability and delivers a broad, easy-to-use powerband with excellent power characteristics throughout the rev range. 2018 model changes improve power delivery in both low-to-mid and mid-to-top-end performance.
  • 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. Unit can be re-started in any gear.
  • NOTE: kick starter has been discontinued/removed (available as an accessory).
    • 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
    • removal of kick starter and related gears etc. reduces weight
  • Lightweight titanium valves and revised load 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
  • Ball-bearing-style crankshaft.
    • bronze thrust washers located between crank webs and rod
    • heat-treated for strength and durability
    • balance ratio of the crank has been 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, compact, hand held "GYTR Power Tuner" allows tailoring of both fuel injection duration and ignition mapping.
    • 9 different setting points can be accessed for both fuel duration and ignition maps
    • maps can be stored and shared with other Power Tuners if desired
    • easy-access GYTR Power Tuner connector port
  • 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.
  • Compact, lightweight, single-core, YZ250F-based dual radiators.
    • outstanding cooling efficiency
    • pre-wired for accessory cooling fan—fits on right side rad only
  • 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
    • Compact bilateral beam aluminum frame.
      • frame design centralizes mass for exceptional handling and agility
      • frame offers an optimum balance between strength, rigidity and tuned flex, plus excellent shock absorbing qualities
      • frame design offers excellent rider-machine communication (a.k.a. feedback)
    • 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 318 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 30mm.
      • suits wide variety of rider sizes
      • handlebar holders are rubber mounted for reduced vibration and improved rider comfort
    • Large 270mm floating front "wave-style" disc and compact Nissin twin-piston caliper.
      • wave disc design reduces weight and improves cooling
      • high-friction brake pads
      • excellent braking performance
    • "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 7.5 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
    • Compact bodywork.
      • minimizes weight and enhances the lightweight feel and look of the YZ250FX
      • 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" (1.85 x 18) D.I.D. rear rims.
      • excellent durability
      • reduce unsprung weight for optimal suspension performance and handling
      • 18" rear wheel improves puncture resistance (Vs. 19" designs)
      • Dunlop AT81 tires


  • Convenient oil level sight glass
  • Lightweight, extra wide foot pegs
  • Folding shift lever tip helps prevent damage
  • Lightweight chain guide / support helps reduce chance of chain derailment and helps protect rear sprocket
  • Heavy duty rubber swingarm protector (chain)
  • Heavy duty sealed "O" ring drive chain
  • Clutch cable features integrated silicone grease and Teflon liner for smooth cable operation
  • Easy access GYTR Power Tuner and Yamaha Diagnostic tool connectors
  • Sealed, no spill, gel type, low maintenance battery (note: any motorcycle battery must be regularly charged during winter storage)


Sale Type
Yamaha Racing Blue
Engine Size
Liquid-cooled, DOHC, 4-valve (titanium), single
Bore And Stroke
77 x 53.6 mm
Compression Ratio
Fuel Delivery
44 mm Keihin throttle body F.I.
Wet sump
Ignition / Starting
TCI / Electric
2,165 mm (85.2'')
825 mm (32.5'')
1,280 mm (50.4'')
1,465 mm (57.7'')
Ground Clearance
325 mm (12.8'')
Seat Height
965 mm (38'')