Standard Features
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The high flying, high paced action of motocross is not for everyone. As a result, the slightly less intense world of cross country / harescramble racing is experiencing solid growth and interest. 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. Check out the impressive list of improvements for 2017.


Model Year
Yamaha Racing Blue


85.2 in. (2,165 mm)
50.4 in. (1,280 mm)
32.5 in. (825 mm)
249 lbs. (113 kg) wet
Ground Clearance
12.8 in. (325 mm)
57.7 in. (1,465 mm)
Seat Height
38 in. (965 mm)


DOHC, 4-valve (titanium), single
15 ci
Bore x Stroke
77 x 53.6 mm
Compression Ratio
Fuel System
Keihin 44 mm throttle body fuel injection
Fuel Tank Capacity
1.7 imp. gal. (7.5 l)
TCI (Transistor Controlled Ignition)
Electric and kick
Wet sump


Wide ratio 6-speed
Final Drive
Gear Ratio
1st: 31/13 = 2.385
2nd: 29/16 = 1.813
3rd: 26/18 = 1.444
4th: 24/21 = 1.143
5th: 22/23 = 0.957
6th: 22/27 = 0.815


Front: 270 mm floating disc / twin-piston caliper
Rear: 245 mm disc / single-piston caliper
Front: 90/90-21
Rear: 110/100-18


Front: Adjustable 48 mm inverted fork; 12.2 in. (310 mm) travel
Rear: Fully adjustable Monocross; 12.5 in. (318 mm) travel

Standard Features

Key Improvements for 2017
 New cylinder head with revised intake & exhaust port shapes  
 Revised intake & exhaust camshafts & valve springs  
 Revised intake tract & intake manifold  
 Revised piston, piston pin & oil jet nozzle  
 Revised connecting rod & crankshaft  
 New crankcase heat treating process  
 Revised 6-speed transmission & gear shift lever  
 Revised airbox cover & fasteners  
 Revised wrap around exhaust header pipe  
 Revised ECU  
 Revised frame & engine mounts  
 Revised fork seals  
 New larger 270 mm front disc  
 Optimized suspension settings  
 Revised fork seal design features a new scraper  
 New, engine trouble & low fuel warning lights  
 Kickstarter has been discontinued to save weight (available as an accessory)  
Key Features FOR 2017
 Latest generation YZ250F based rear slanting engine & Bilateral Beam chassis  
 Forward mounted fuel injection & wrap around exhaust  
 Electric starting  
 YZ based, fully adjustable KYB suspension  
 18 inch rear wheel  
 Adjustable handlebar  
 GYTR Power Tuner compatible  
 Revised, "reversed" liquid-cooled, 250 cc, DOHC, 4-valve (titanium), single with fuel injection. The engine has been tuned for excellent "ride ability & controllability" and delivers a broad, easy to use power band with excellent power characteristics throughout the rev range. 2017 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 & 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 & provides optimum fuel / air filling & 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 & 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 & related gears etc. reduces weight  
 Revised, 4-valve cylinder head features a 13.5:1 compression ratio.  
    Intake port has been raised 4 mm (vs. '16) for improved flow  
    Larger diameter intake valve seats improve flow  
    Improved power delivery across the rev range (low, mid & top)  
    4-valve design offers optimum flow & excellent power  
 Lightweight titanium valves & revised load optimized valve springs.  
    Titanium valves reduce reciprocating weight & allow for a higher rpm limit before valve float  
    Intake & exhaust valve spring size have been increased to match revised cams  
    Titanium valves means a faster-revving engine with smooth power delivery  
    31 mm titanium intake valves & 25 mm titanium exhaust valves  
 Shorter internal air box funnel & new intake manifold with larger cross section.  
    Improved fuel - air flow for increased power  
    Improved over-rev feeling  
    Reduced horsepower losses in the mid to high rpm (reduced friction as fuel-air "charge"  
    Travels thru the intake tract)  
 Automatic cam chain tensioner.  
    Reduces maintenance  
    Special cam chain "sliders" reduce internal friction losses  
 Revised, intake & exhaust camshafts.  
    Revised intake & exhaust cam profiles (working angle & lift) for improved power & "control-ability"  
    Hollow design reduces weight  
 New, lightweight, short-skirt, forged aluminum piston.  
    New, lighter, flat top piston features lateral ribs on both sides of the piston pin area  
    7% reduction in piston weight means faster engine response  
    Single compression ring & specially designed oil control ring increases surface contact area for better sealing  
    2-ring design decreases sliding resistance, reduces weight & provides faster throttle response  
 Revised, lighter weight piston pin features a diamond like coating (DLC) to reduce friction.  
 Revised, piston oil cooler jet nozzle directs oil to the desired portion of the cylinder & underside of piston.  
    Reduces piston, cylinder & 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 & reducing weight  
    Excellent heat dissipation for consistent power delivery  
    Coating enhances the thin film of oil between cylinder & piston, reducing friction & increasing power  
 Cylinder & 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  
 New heating treating process for crankcases.  
    Heating treating process increases crankcase strength by 5%  
    Improved crankcase strength matches increased power output  
 Revised ball bearing style crankshaft.  
    New bronze thrust washers added between crank webs & rod  
    Heat treated for strength & durability  
    Balance ratio of the crank has been optimized to reduce vibration & improve torque feeling  
 New nickel-chromium-molybdenum connecting rod.  
    Excellent strength & durability  
    Increased strength to maintain precise big end roundness during high rpm & high load use  
    Bronze thrust washers on either side of the rod to reduce friction  
 Lightweight gear driven counter balancer shaft.  
    Reduces vibration for improved rider comfort & less rider fatigue  
 Revised 6-speed transmission utilizes a 2-bar, floating shift guide system & a 14 mm shift shaft.  
    New surface treatment on selected gears for durability  
    New, stronger heat treated gear shift lever  
    Transmission utilizes a 2-bar, floating shift guide system & a 14 mm shift shaft  
    Good durability in the event of a crash (14 mm shift shaft)  
 Revised, heavy duty, multi-plate, clutch features a quick access magnesium outer cover.  
    New low friction bushing on actuation arm reduces lever pull / effort  
    Clutch is designed for the rigours of cross country  
    Outer cover provides fast & easy clutch access  
 44mm Keihin throttle body fuel injection system.  
    10-hole injector  
    Maximizes fuel atomization for more complete combustion & excellent power delivery  
    FI benefits include automatic adjustments to insure the optimum fuel - air ratio regardless of outside air temperature & altitude  
    Other benefits include excellent starting & excellent throttle response  
    Cold start knob also doubles as an idle adjuster  
 Injector spray pattern, spray direction & distance to the intake valves have been optimized.  
    Forward mounted straight intake tract maximizes benefits of the FI system & improves power output  
 New, handlebar mounted engine trouble & low fuel warning lights.  
 Optional, compact, hand held "GYTR Power Tuner" allows tailoring of both fuel injection duration & ignition mapping.  
    9 different setting points can be accessed for both fuel duration & ignition maps  
    Maps can be stored & shared with other Power Tuners if desired  
    Easy access GYTR Power Tuner connector port  
 Revised 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 & faster oil changes)  
    Oil volume is optimized to reduce oil related drag & 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  
 Revised ECU with new ignition mapping & fuel mapping for improved power & over rev feeling.  
 High capacity AC magneto eliminates need for a battery.  
 Revised, wrap-around exhaust system to match head, cam & intake improvements.  
    Header pipe diameters have been revised for a 12 to 16% flow improvement  
    Exhaust exits from the rear of the engine & 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 CMRC & AMA regulations  
 Works-style race-spec "barrel adjuster" for on-the-fly clutch lever free play adjustments.  
 New, 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  
    No special procedure to re-start the bike... Just kick it and go  
Chassis / Suspension
 Revised, compact "Bilateral Beam" aluminum frame.  
    Revised frame with wider spars in the swingarm pivot area (up to 12 mm wider)  
    Revised engine mounts  
    Frame & engine designs centralize mass for exceptional handling & agility  
    Frame offers an optimum rigidity balance between strength, rigidity & 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 & 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  
 Revised, YZ250F based, 48 mm, adjustable, inverted, Kayaba "SSS" cartridge fork offers 310 mm (12.2 in.) of wheel travel.  
    Revised fork seal design features a new scraper for improved cleaning performance in muddy conditions  
    Revised valving & 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 & oil chambers)  
    Helps prevent aerated fork oil from entering the inner damper assembly & 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 & improves bottoming characteristics  
    TCV offers more precise control throughout the full suspension stroke  
    TCV is located on the upside of the spring & its function is controlled by piston speed, not piston position, hence the term "Speed Sensitive System fork"  
 Revised fork seal design features a new scraper for improved cleaning performance in muddy conditions.  
 Large "wrap-around" plastic fork protectors provide excellent lower fork tube protection.  
 "Self-supporting" design reduces friction for smoother fork operation.  
 Revised YZ250F based, Monocross link rear suspension features a fully adjustable Kayaba piggyback shock with 318 mm (12.5 in.) of wheel travel.  
    Revised valving & 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 & 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 & improved rider comfort  
 New, larger, 270mm floating front "wave-style" disc & compact Nissin twin piston caliper.  
    Wave disc design reduces weight & improves cooling (wave design offer more surface area for better 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 & single piston Nissin caliper & Nissin master cylinder.  
 Rear caliper & 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 & 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  
    New, handlebar mounted engine trouble & low fuel warning lights  
 Compact body work.  
    Reduces weight & enhances the lightweight feel and look of the YZ250FX  
    Flat design, "minimal" bodywork allows for fast, easy rider movements & 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 & 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 in. (1.60 x 21) front & 18 in. (1.85 x 18) D.I.D. rear rims.  
    Excellent durability  
    Reduce unsprung weight for optimal suspension performance & handling  
    18 in. rear wheel improves puncture resistance (vs. 19 in. 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 & helps protect rear sprocket  
 Heavy duty rubber swingarm protector (chain)  
 Heavy duty sealed "O" ring drive chain  
 Clutch cable features integrated silicone grease & Teflon liner for smooth cable operation  
 Easy access GYTR Power Tuner & Yamaha Diagnostic tool connectors  
 Sealed, no spill, gel type, low maintenance battery (note: any motorcycle battery must be regularly charged during winter storage)  

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