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

• super crisp, instant "right now" engine power (when in the "power band")
• easy & economical to maintain, service & rebuild

• 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)

• excellent durability
• light weight means fast engine response

• excellent heat dissipation
• reduced weight (no heavy iron liner)
• reduced friction
• extended cylinder life

• lightweight design for fast throttle response
• friction reducing crank seals

• 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

• precise fuel - air mixing
• extra-crisp throttle response throughout the powerband

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

• 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

• 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

• delivers a precise spark for fast, sure starts
• ensures optimal timing at all rpms for fast, strong response

• excellent filtering qualities
• reduces maintenance costs ... foam filter is re-useable

• maximum cooling efficiency

• 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

• light, easy lever pull
• lever position (reach) can be set to rider's preference
• for on-the-fly clutch adjustments

• 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

• 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

• produced by "hydro forming", a forming method that uses high pressure water to form shapes
• excellent rear wheel traction & control
• lightweight design

• strong yet lightweight
• fast, agile handling

• allow handlebar to be moved 10mm rearward if desired

• 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

• 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".

• provide excellent protection from dirt, mud & stone chips
• "self-supporting" design reduces friction for smoother stroke

• 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

• "wave" style rotor (disc) reduces weight, improves cooling (more surface area) & improves styling
• braking performance is excellent with great feel & control

• 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

• increases the contact area between the sprocket & chain rollers
• reduces the load on the chain & increases service life of chain & sprocket

• provide excellent durability
• reduces unsprung weight for optimal suspension performance & handling

• 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

• on - off - reserve fuel petcock
• reserve amount is approx. 2 litres

• 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.