THE ULTIMATE 2‑STROKE OFF‑ROAD RACER.
The ultimate 2‑stroke off‑road racing machine built to win X‑Country races.
CONQUER DIRT
Cross country and enduro racing are currently experiencing increased popularity and growth. Based on the legendary YZ250 2-stroke, the “X” version has been developed using all of Yamaha’s extensive 2-stroke knowledge to produce a model that offers a high level of performance for cross country racing. The YZ250X is a lightweight, compact machine that is both exciting to ride and affordable to own and maintain.
PERFORMANCE
The YZ250X is a super light weight package that offers serious 2-stroke power. The engineers modified the cylinder head, adjusted the compression ratio, revised the exhaust port timing and changed the gear ratios in the 5-speed transmission to better suit cross country racing (vs. YZ250). The YZ250X engine offers a good depth of power with an easy to use engine character.
THE EXTRAS
Cross country focused chassis features include softer suspension settings front & rear, an 18″ rear wheel for more puncture resistance, an aluminum side stand and a fuel petcock that offers a reserve position for peace of mind (vs. YZ250).
2018 Yamaha YZ250X Totalmotorcycle.com 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.
- “Re-tuned” engine Vs. YZ250 (head, ignition, porting & YPVS)
- Wider ratio transmission gears Vs. YZ250 (3rd gear & higher)
- Heavy duty clutch
- Expansion chamber shape
- Unique front & rear suspension settings
- 18″ rear wheel
- Aluminum side stand
- On-off-reserve fuel petcock
- 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 de-railing 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
- Stunning Two-Stroke Power, Tuned for Cross-Country and Hare Scrambles Racing
The YZ250X is optimized for the unique demands of Hare Scrambles and GNCC® racing. The YPVS™-equipped 249cc two-stroke engine is combined with a wide-ratio five-speed transmission for the ultimate cross-country power plant. - Motocross-Derived Aluminum Frame
Ultra-lightweight YZ250-spec frame features carefully engineered combination of aluminum castings, forgings and extrusions for the perfect balance of rigidity and flex, with industry-leading fully adjustable, KYB® speed sensitive spring-type suspension tested and tuned specifically for the needs of cross-country racers. - Racing Style and Ergonomics
The YZ250X carries the racing heritage of the YZ250 motocrosser with aggressive styling from front fender to the rear brake protector, and is ready to race out of the crate, complete with an aluminum tapered handlebar, YZ-F-style foot pegs, gripper seat, and off-road specific Dunlop® tires. - GNCC-Specific features
18-inch rear wheel, sealed O-ring chain, wide ratio transmission, narrow expansion chamber, off-road focused tires and suspension settings, a standard side stand and fuel tank petcock with reserve position. - 270mm Front Brake
Large 270mm front disc brake coupled with high-performance pad material offers outstanding machine control and performance, with exceptional stopping power and controllability.
2018 Yamaha YZ250X Totalmotorcycle.com Features and Benefits
ENGINE
- Lightweight, compact, liquid-cooled, 249cc, piston-reed-valve-inducted, 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 re-useable
- 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 design 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, Sun Star 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 litre plastic resin fuel tank.
- on – off – reserve fuel petcock
- reserve amount is approx. 2 litres
- Lightweight aluminum side stand.
2018 Yamaha YZ250X – Totalmotorcycle.com USA Specifications/Technical Details
US MSRP Price: $7,499 USD
Bore x Stroke 66.4mm × 72.0mm
Compression Ratio 7.9~9.4:1
Fuel Delivery Keihin® PWK38S
Ignition CDI
Transmission Constant-mesh 5-speed; multiplate wet clutch
Final Drive Chain
Suspension / Front KYB® Speed-Sensitive System inverted fork;
fully adjustable, 11.8-in travel
Suspension / Rear KYB® single shock; fully adjustable, 12.4-in
travel
Brakes / Front Hydraulic disc, 270mm
Brakes / Rear Hydraulic disc, 245mm
Tires / Front 90/90-21 Dunlop® AT81F
Tires / Rear 110/100-18 Dunlop® AT81
L x W x H 86.0 in x 32.5 in x 50.8 in
Seat Height 38.2 in
Wheelbase 58.5 in
Rake (Caster Angle) 27.7°
Trail 4.8 in
Ground Clearance 14.2 in
Fuel Capacity 2.1 gal
Wet Weight 229 lb
Warranty 30 Day (Limited Factory Warranty)
Color Team Yamaha Blue
2018 Yamaha YZ250X – Totalmotorcycle.com Canadian Specifications/Technical Details
Canada MSRP Price: $8,049 CDN
ENGINE
Engine
2-stroke, liquid-cooled, reed-valve, single
Displacement
249 cc
Bore and Stroke
66.4 x 72 mm
Compression Ratio
7.9 ~ 9.4:1
Fuel Delivery
Keihin PWK38S
Ignition / Starting
CDI / Kick
Transmission
5-speed transmission
primary ratio 3.000 (63/21)
secondary ratio 3.571 (50/14)
1st gear 1.929 (27/14)
2nd gear 1.533 (23/15)
3rd gear 1.313 (21/16)
4th gear 1.050 (21/20)
5th gear 0.840 (21/25)
Final Drive
“O” ring chain
CHASSIS
Suspension (Front)
Adjustable 48 mm inverted fork / 300 mm (11.8″) travel
Suspension (Rear)
Fully adjustable link Monocross / 315 mm (12.4″) travel
Brakes (Front)
270 mm floating disc / twin piston caliper
Brakes (Rear)
245 mm disc / single piston caliper
Tires (Front)
90/90-21
Tires (Rear)
110/100-18
CRITICAL DATA
Length
2,185 mm (86″)
Width
825 mm (32.5”)
Height
1,290 mm (50.8”)
Wheelbase
1,485 mm (58.5”)
Ground Clearance
360 mm (14.2″)
Seat Height
970 mm (38.2”)
Fuel Capacity
8 litres (1.8 imp. gallons)
Wet Weight
104 kg (229 lbs)
Colour(s)
Yamaha Racing Blue
2018 Yamaha YZ250X – Totalmotorcycle.com European Specifications/Technical Details
Europe/UK MSRP Price: £ GBP (On The Road inc 20% Vat)
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Manufacturer Specifications and appearance are subject to change without prior notice on Total Motorcycle (TMW).
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