Value Your Trade in 30 Seconds

2018 Yamaha YZ250F


Ladysmith Motorsports
Primary Color
Yamaha Blue
Stock #


Dealer Insights

Freight, PDI & Taxes extra.


The fuel injected YZ250F offers excellent power and amazing cornering performance thanks to exhaustive mass centralization efforts and a compact, super responsive chassis design. At the 2017 YZ250F press test, numerous journalists were shocked by the wide spread of power the YZ250F produces, even from low rpms. The YZ250F has the response and depth of power that the competition can't match.

Mass Centralization: Yamaha's innovative engine design with forward mounted fuel injection delivers class leading power & handling. The "reversed" engine design concentrates many of the motorcycle's heaviest components; engine, fuel tank & exhaust system, towards the center of the motorcycle achieving excellent mass centralization and reduced gyroscopic effects for light , nimble, championship winning performance.

  • Engine: 4-stroke, liquid-cooled, DOHC, 4-valve (titanium), single
  • Displacement: 250cc
  • Bore and Stroke: 77 x 53.6 mm
  • Compression Ratio: 13.5:1
  • Fuel Delivery: 44 mm Keihin throttle body F.I.
  • Lubrication: Wet sump
  • Ignition / Starting: TCI / Kick
  • Transmission: 5-speed transmission: Primary ratio 3.353 (57/17); Secondary ratio 3.846 (50/13); 1st gear 2.143 (30/14); 2nd gear 1.750 (28/16); 3rd gear 1.444 (26/18); 4th gear 1.222 (22/18); 5th gear 1.042 (25/24)
  • Final Drive: Chain
  • Suspension (Front): Adj. 48mm, inverted fork / 310mm (12.2 in.) wheel travel
  • Suspension (Rear): Fully adj. Monocross / 315mm (12.4 in.) wheel travel
  • Brakes (Front): 270mm, floating disc / twin piston caliper
  • Brakes (Rear): 245mm disc / single piston caliper
  • Tires (Front): 80/100-21
  • Tires (Rear): 100/90-19
  • Length: 2,165mm (85.2 in.)
  • Width: 825mm (32.5 in.)
  • Height: 1,280mm (50.4 in.)
  • Wheelbase: 1,475mm (58.1 in.)
  • Ground Clearance: 325mm (12.8 in.)
  • Seat Height: 965mm (38 in.)
  • Fuel Capacity: 7.5 L (1.7 imp. gal.)
  • Wet Weight: 105 kg (231 lb.)
  • Colour(s): Purplish White, Yamaha Racing Blue
Key Features
  • Revolutionary reversed engine design with front mounted FI system & rear exiting exhaust
  • Mass centralizing rearward-slanted-cylinder helps keeps weight centred in the chassis
  • "Battery-less" 44mm throttle body FI & easy access air box
  • Compact aluminum Bilateral Beam frame & aluminum swingarm
  • Industry-leading, fully adjustable KYB® "SSS" fork & Monocross rear suspension
  • 270 mm front & 245 mm rear disc brakes
  • Adjustable, tapered aluminum handlebar
  • GYTR® Power Tuner Ready
Engine Features
  • Design goals for the fuel injected YZ250F are a balance of easy cornering & a lightweight feeling. thanks to excellent mass centralization. The fuel injected engine features a wide, controllable power band that sets the standard in the 250 class: excellent "ride ability & controllability"; broad power from low rpms right through to high rpm with excellent power characteristics
  • "Reversed" liquid-cooled, 250cc, DOHC, 4-valve (titanium), single with fuel injection: excellent "ride ability & controllability"; broad power from low rpms right through to high rpm with excellent power characteristics
  • Rearward slanted, reversed cylinder design: rearward slant moves a significant amount of rotating weight toward the centre of the chassis, centralizing mass for light, agile handling
  • "Reversed" engine design (FI system is front mounted, exhaust exits from rear of cylinder): FI throttle body & air box are front mounted, providing a straight intake path; straight shot intake path provides optimum fuel / air / exhaust flow for excellent power; front mounted intake 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
  • 4-valve cylinder head features a 13.5:1 compression ratio: 4-valve design offers optimum flow & excellent power; compact combustion chamber provides optimum combustion speed while also reducing heat & power losses
  • Lightweight titanium valves: 31 mm titanium intake & 25 mm titanium exhaust valves with load reduced valve springs; load reduced valve springs reduce internal power losses; titanium valves reduce weight & improve performance... titanium valves are 40 to 45 % lighter than steel valves; reduced valve weight improves valve train reliability & longevity; reduced reciprocating weight allows for a higher rpm limit & better control of the valves
  • Automatic cam chain tensioner: reduces maintenance & mechanical engine noise; special cam chain "sliders" reduce internal friction losses
  • High lift intake & exhaust camshafts: strong power with excellent "control-ability"; hollow design reduces weight
  • "Liner-less" lightweight aluminum cylinder features a ceramic composite coating applied directly to the aluminum block: ceramic coating sprayed directly on aluminum block, eliminating the need for a heavy liner & therefore reducing weight; excellent heat dissipation for consistent power delivery; coating enhances the thin film of oil between cylinder & piston, reducing friction & increasing power
  • Cylinder "cutaways" allow air "trapped" under the piston to enter a special side chamber (cutaway): reduces horsepower-robbing "pumping losses"
  • Crankcase also utilizes special "cutaways.": reduces horsepower-robbing "pumping losses"; crankcase cutaways match cylinder cutaways for maximum efficiency
  • Lightweight, short-skirt, forged aluminum piston: flat top piston with lateral ribs on both sides of the piston pin area for strength & durability; single compression ring & specially designed oil control ring increases the surface contact area for better sealing; 2-ring design decreases sliding resistance, reduces weight & provides faster throttle response
  • Lightweight piston pin with diamond like coating (DLC): reduces internal friction
  • 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
  • Ball bearing style crankshaft: heat treated for strength & durability; balance ratio of the crank has been optimized to reduce vibration
  • Nickel-chromium-molybdenum connecting rod: excellent strength & durability; molybdenum coated 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
  • 5-speed transmission utilizes a 2-bar, floating shift guide system & a 14 mm shift shaft: gears ratios are matched to engine power; floating shift guide system provides smooth, positive shifts; 14 mm shift shaft provides good durability in the event of a crash; see spec page for gear ratios
  • Heavy duty, clutch with quick access magnesium outer cover & on the fly "barrel" adjuster: quick access, lightweight, magnesium outer cover provides fast & easy clutch access; light lever pull for reduced hand fatigue during a long moto; works-style lever mounted "barrel adjuster" for on-the-fly clutch lever free play adjustments
  • 44mm Keihin throttle body fuel injection system: 10-hole injector maximizes fuel atomization for more complete combustion; FI benefits include automatic adjustments to insure the optimum fuel — air ratio regardless of outside air temperature & altitude; other benefits include excellent starting & instant 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
  • 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 injection duration & ignition maps; maps can be stored & 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: no tools required to access air filter; washable foam filter reduces tune up costs
  • Wet sump lubrication system with "cartridge-type" oil filter: reduces weight (no remote oil tank or oil lines); oil volume is optimized to reduce oil related drag & weight; fast & easy oil changes
  • Compact, lightweight, single core, dual radiators: provide excellent 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: exhaust exits from the rear of the engine & circles cylinder body; wrap-around design ensures the optimum tuned header length; design maximizes exhaust "pulse effect" for excellent power delivery; centralizes mass by moving weight closer to the centre of the chassis
  • Wrap-around exhaust: exhaust exits from the rear of the engine & circles cylinder body; wrap-around design ensures the optimum tuned header length; design 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; muffler / silencer is re-buildable for optimum performance & reduced noise levels
  • Special "G" sensor system: shuts down fuel injection system if bike lies on its side for more than 10 seconds; no special procedure to re-start the bike... just kick it & go; helps prevent costly engine damage
Chassis/Suspension Features
  • Compact "Bilateral Beam" aluminum frame: frame & engine designs centralize mass for exceptional handling & maneuverability; frame offers an optimum rigidity balance between strength, rigidity & tuned flex, plus excellent shock absorbing qualities; frame design provides excellent "rider — machine communication" (a.k.a. feedback); key goal of this chassis design is faster & easier cornering ... one of the keys to winning races
  • 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; reduces costs in the event of damage
  • 48mm, adjustable, inverted, Kayaba "SSS" cartridge fork offers 310mm (12.2") of wheel travel: front fork adjustments include: 20-way compression damping & 20-way rebound damping; inner tubes feature a special friction reducing coating for reduced stiction; 22 mm front axle; optional fork springs are available through Genuine Yamaha parts
  • Fork features a twin-chamber, "Speed Sensitive System" (SSS) design: damper unit is in a separate structure (completely separate 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 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"
  • Large "wrap-around" plastic fork protectors: provide excellent lower fork tube protection; "self-supporting" design reduces friction for smoother fork operation
  • Adjustable handle bar holders offer a total of 4 different handlebar positions with an adjustment range of 30mm: suits wide variety of rider sizes; handle bar holders are rubber mounted for reduced vibration & improved rider comfort
  • Monocross link rear suspension with 315 mm (12.4") of wheel travel: features a fully adjustable KYB piggyback shock; separate adjusters for high- and low-speed compression damping; shock is in-line with the center axis of the frame for excellent control; shock adjustments include: threaded spring preload, low-speed compression damping, high speed compression damping & rebound damping
  • 270 mm 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); "shorty style" adjustable front brake lever can be adjusted to fit various hand sizes; high friction brake pads; excellent braking performance
  • 245 mm rear disc brake uses a "wave-style" disc & single piston Nissin caliper & master cylinder: wave disc design reduces weight & improves cooling (wave design offer more surface area for better cooling); rear caliper & lower portion of the wave style 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 (for servicing under the tank); compact in-tank electric fuel pump
  • Compact body work: reduces weight & enhances the lightweight look & feel of the YZ250F; 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
  • Rugged Excel rims: excellent durability & strength; reduces unsprung weight for optimal suspension performance & handling; front rim size is 1.60 x 21"; rear is 1.85 x 19"; rear hub features second bearing on sprocket side for increased rigidity & durability
  • 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 DID 520 chain
  • Clutch cable features integrated silicone grease & Teflon liner for smooth cable operation
  • Easy access GYTR Power Tuner & Yamaha Diagnostic tool connectors
Every attempt has been made to showcase Canadian versions of our products, but all images, information and specifications may not be exact and are subject to change without notice. Some models may be shown with optional accessories.



Engine Type
4-stroke, liquid-cooled, DOHC, 4-valve (titanium), single
Bore and Stroke
77 x 53.6 mm
Compression Ratio
Fuel System
44 mm Keihin throttle body F.I.


Front Suspension
Adj. 48mm, inverted fork / 310mm (12.2 in.) wheel travel
Front Brakes
270mm, floating disc / twin piston caliper
Front Tire
Rear Suspension
Fully adj. Monocross / 315mm (12.4 in.) wheel travel
Rear Brakes
245mm disc / single piston caliper
Rear Tire


Dry Weight
Curb Weight: 105 kg (231 lb.)
Fuel Capacity
7.5 L (1.7 imp. gal.)
1,475mm (58.1 in.)
Ground Clearance
325mm (12.8 in.)
Seat Height
965mm (38 in.)


Final Drive


Purplish White, Yamaha Racing Blue


Related Products