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ID # 17383391

2021 Yamaha YZ250

  • 2021 Yamaha YZ250
  • 2021 Yamaha YZ250
  • 2021 Yamaha YZ250
  • 2021 Yamaha YZ250
  • 2021 Yamaha YZ250
  • 2021 Yamaha YZ250
  • 2021 Yamaha YZ250
  • 2021 Yamaha YZ250
  • 2021 Yamaha YZ250
  • 2021 Yamaha YZ250
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Overview

Revive memories of the good ol' days with a YZ two-stroke! Nothing beats the bark and instantaneous throttle response of the lightweight YZ250. Not only is a two-stroke more affordable and easier to maintain, it also provides a very entertaining ride.
POWER
The liquid-cooled, 249 cc, piston-reed-valve-inducted, 2-stroke engine is lightweight and compact.
PERFORMANCE
The Yamaha Power Valve System (YPVS) features a total of three slides (one main and two auxiliary slides) which provides the benefits of both solid, low rpm power delivery and a strong top-end punch. The YPVS system varies the exhaust port height and timing based on engine rpm.
Features & Benefits
   
Key Features
  • Compact, liquid-cooled, 249 cc, piston-reed-valve-inducted, 2-stroke engine
  • Smooth shifting, 6-speed, close ratio transmission
  • Keihin PWK38S carb with 4-petal carbon fiber reeds
  • Yamaha's patented YPVS exhaust power valve system
  • Lightweight, aluminum, semi-double-cradle frame with detachable rear subframe
  • Fully adjustable KYB suspension
  • 270 mm front & 245 mm rear disc brakes
  • Adjustable aluminum handlebar & titanium foot pegs
  • Aggressive, modern styling
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
  • 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 and 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, 5-speed, close-ratio 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
  • Heavy-duty, multi-plate clutch.
    • 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
  • Works-style clutch lever & race-spec 'barrel adjuster.'
    • light, easy lever pull
    • 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 300mm (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
    • 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 315mm (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
    • damper rod is 18 mm in diameter
    • 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
  • 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
  • Lightweight, D.I.D. 21' front and 19' 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.
DETAILS

 
  • Slim design, modern 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 chain
  • E10 friendly fuel system components

 

 

Specifications
Model
YZ
Category Name
Motorcycles
Year
2021
Width
825 mm (32.5 in)
Engine
2-stroke, liquid-cooled, crankcase reed-valve, single
Height
1,290 mm (50.8")
Length
2,185 mm (86")
Wheelbase
1,485 mm (58.5")
Seat Height
970 mm (38.2")
Fuel Delivery
Keihin PWK38S
Bore And Stroke
66.4 x 72 mm
Ground Clearance
360 mm (14.2")
Compression Ratio
8.9~10.6:1
Ignition / Starting
CDI / Kick

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