2024 Yamaha YZ250X

Notes:

Description

Engineered with all the reliability and durability you've come to expect from Yamaha, this 2‑stroke was born to win Cross Country races. Featuring a robust 250cc 2-stroke engine, optimized rider ergonomics, and a long list of XC features that solidifies its position as the king of woods!

Key Features

The YZ250X is based on the YZ250 2-stroke with the following additional features that enhance its competitiveness for cross country racing / riding.

• Optimized rider ergonomics to improve mobility in challenging cross-country conditions

• Optimized intake design allows for a straight, more efficient draw of air into the intake tract.

• High performance braking system features large front pistons, rigid caliper and a 270mm front rotor

• Wide ratio transmission gears Vs. YZ250 (3rd gear & higher)

• Heavy duty clutch

• Expansion chamber shape

• Unique front & rear suspension settings

• 18" rear wheel

• "Re-tuned" engine Vs. YZ250 (head, ignition, porting & YPVS)

• Aluminum side stand

• On-off-reserve fuel petcock

Engine

• Lightweight, compact, liquid-cooled, 249cc, piston-reed-valve-induced, 2-stroke.

• super crisp, instant "right now" engine power (when in the "power band")

• easy & economical to maintain, service & rebuild

• Key engine differences Vs YZ250. 

• revised cylinder head volume Vs. YZ250 (slight increase in volume Vs. YZ250)

• 7.9:1 compression ratio (slightly less than YZ250)

• revised YPVS power valve (actuation rpm & shape)

• revised exhaust port (main) size & timing

• wider 3rd, 4th & 5th gears ratios

• expansion chamber front diameter (reduced)

• Lightweight, flat top forged aluminum piston. 

• excellent durability

• light weight means fast engine response

• "Liner-less", ceramic composite cylinder bore with ceramic coating sprayed directly on the aluminum block. 

• excellent heat dissipation

• reduced weight (no heavy iron liner)

• reduced friction

• extended cylinder life

• Lightweight, ball bearing style crank. 

• lightweight design for fast throttle response

• friction reducing crank seals

• YPVS power valve system features a total of three slides (one main and two auxiliary slides). 

• YPVS system varies the exhaust port height & timing based on engine rpm

• provides the benefits of both solid, low rpm power delivery & strong top-end punch

• Keihin PWK38S carburetor with power jet & throttle position sensor (TPS). 

• precise fuel - air mixing

• extra-crisp throttle response throughout the powerband

• Special-design, 4-petal, carbon fiber reeds. 

• excellent throttle response & engine performance across the entire RPM range

• Smooth-shifting, wide ratio 5-speed transmission. 

• ratios are matched to engine output for maximum performance

• optimal hook-up for outstanding acceleration & corner-exiting power

• transmission features "involute splines" for smooth, positive shifting even under power

• wider 3rd, 4th & 5th gears ratios (Vs. YZ250) ... see spec sheet

• Heavy-duty, multi-plate clutch. 

• Clutch spring load is reduced for easier clutch lever pull Vs. YZ250 (less fatigue)

• quick-access, outer clutch cover allows for fast, easy clutch maintenance

• CD (capacitor discharge) ignition system. 

• delivers a precise spark for fast, sure starts

• ensures optimal timing at all rpms for fast, strong response

• High capacity, washable, dual-stage, foam air filter. 

• excellent filtering qualities

• reduces maintenance costs ... foam filter is reusable

• Large-capacity, dual radiators feature 10-row cores. 

• maximum cooling efficiency

• Lightweight exhaust system. 

• computer designed expansion chamber provides maximum engine performance

• lightweight, aluminum silencer is re-buildable for optimum performance & reduced noise levels

• sound output is 94 dB

• Works-style clutch lever & race-spec "barrel adjuster." 

• light, easy lever pull

• lever position (reach) can be set to rider's preference

• for on-the-fly clutch adjustments

Chassis/Suspension

• Lightweight, aluminum, semi-double-cradle frame. 

• combines with compact engine to provide an awesome power to weight ratio

• obvious benefit of an aluminum frame is a significant weight reduction

• Yamaha maintains the semi-double cradle design because it offers an excellent "rigidity balance" between lateral & torsional rigidity while offering controlled flex in the longitudinal plane

• result is a light aluminum frame, which provides excellent handling, good ride quality, excellent stability & responsive cornering performance

• Removable rear subframe. 

• constructed of square-section, lightweight aluminum

• detachable design allows easy access when servicing rear suspension components

• reduces costs in the event of a loop out

• Lightweight, tapered aluminum swingarm. 

• produced by "hydro forming", a forming method that uses high pressure water to form shapes

• excellent rear wheel traction & control

• lightweight design

• Cast aluminum upper and forged lower triple clamps. 

• strong yet lightweight

• fast, agile handling

• Adjustable handlebar mounts. 

• allow handlebar to be moved 10mm rearward if desired

• "Speed Sensitive System" 48mm, adjustable, inverted, "twin chamber" KYB fork. Front wheel travel is 300 mm (11.8").

• twin chamber design means the damper unit is in a separate structure which prevents aerated fork oil from entering the inner damper assembly & degrading its damping abilities

• the inner damper is pressurized, it also eliminates bubbles forming in the oil

• "Speed Sensitive" design means the damping force is controlled by piston speed, not position in the fork

• low friction fork seals provide reduced stiction for a smoother stroke

• spring & damping settings are optimized for cross country use

• fork adjustments include: 20-way compression damping & 20-way rebound damping

• optional fork springs are available through Genuine Yamaha parts

• 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".

• Large "wrap-around" plastic fork protectors. 

• provide excellent protection from dirt, mud & stone chips

• "self-supporting" design reduces friction for smoother stroke

• Monocross link rear suspension features a fully adjustable, Kayaba, piggyback shock which provides 315 mm (12.4") of wheel travel. 

• features separate adjusters for high- and low-speed compression damping

• adjustments include: spring preload, 20-way rebound damping, 20-way low-speed compression damping & 2 turns of high speed compression damping

• spring & damping settings are optimized for cross country use

• 18 mm damper rod

• Kashima coating (friction reducer) is used in the shock body & sub tank to reduce friction & improve suspension performance

• piggyback shock utilizes a full rebound oil lock system for excellent suspension function & great ride quality

• spring & damping settings are optimized for cross country use

• 270 mm floating front "wave-style" disc brake with Nissin twin piston caliper. 

• "wave" style rotor (disc) reduces weight, improves cooling (more surface area) & improves styling

• braking performance is excellent with great feel & control

• "Shorty" front brake lever is adjustable for various hand sizes. 

• 245 mm rear "wave-style" disc brake with single piston caliper. 

• integrated master cylinder (fluid reservoir is integrated into the top of the master cylinder)

• "wave" style rotor (disc) reduces weight, improves cooling (more surface area) & improves styling

• strong stopping power with excellent feel & control

• Rugged, plastic rear caliper & lower rear disc protectors / guards. 

• Lightweight, SunStar rear sprocket. 

• increases the contact area between the sprocket & chain rollers

• reduces the load on the chain & increases service life of chain & sprocket

• Heavy duty "O"- ring chain for excellent durability. 

• Lightweight, D.I.D. 21" front and 18" rear rims & premium Dunlop tires. 

• provide excellent durability

• reduces unsprung weight for optimal suspension performance & handling

• "Flat-design" seat features multi density foam. 

• provides good initial softness / comfort and then increases the firmness as more pressure is applied

• "pebble" finish on the top and side surfaces provides excellent rider grip & durability

• Seat, handlebar & fuel tank ergonomics provide excellent freedom of movement for the rider. 

• Large, 8 liter plastic resin fuel tank. 

• on - off - reserve fuel petcock

• reserve amount is approx. 2 liters

• Lightweight aluminum side stand.

Details

• Bold New YZ Styling

• Along with the slimmer, more aggressive bodywork, a new front and rear fender design and new radiator shrouds all integrate with a bold new graphics scheme to highlight the YZ family pedigree. Premium Yamaha graphics are now embedded to provide excellent durability and scratch resistance.

• Slim design, aggressive bodywork allows easy rider movements

• Lightweight YZ250F/450F based wide footpegs provide excellent grip & ground clearance

• Rugged chain guide helps prevent the chain from derailing and also helps to protect the rear sprocket.

• Serrated rear brake lever and folding shift lever tip

• Stainless steel, inner clutch cable provides excellent strength, smooth action and long life

• Heavy-duty 520 "O" ring chain

• E10 friendly fuel system components