2017 YZ125 (2-Stroke)

$6,999

Lightweight, quick and easy to maintain, the YZ125 is a perfect transition for those too big for 85’s but too small or inexperienced for bigger, more powerful 4-strokes. A larger 270mm front disc brake highlights the 2017 improvements.

Dealer #: 6249


INQUIRY ABOUT PRODUCT

Key Improvements for 2017

  • Larger 270 mm front disc brake with wave-style rotor & twin piston caliper

Key Features

  • Easy to service, liquid-cooled, 124cc, crankcase reed valve-inducted, 2-stroke engine
  • Smooth shifting, 6-speed, close ratio transmission
  • Yamaha’s patented YPVS exhaust power valve system
  • Lightweight, aluminum, semi-double-cradle frame with detachable rear subframe
  • Fully adjustable suspension
  • Aluminum handlebar & titanium foot pegs
  • Aggressive, modern styling

ENGINE

  • Liquid-cooled, 124cc, crankcase reed valve-inducted 2-stroke engine provides class leading power & acceleration.
    • super crisp, instant “right now” engine power (when in the “power band”)
    • easy & economical to maintain, service & rebuild
  • 7.5-degree cylinder angle & straight shot intake path through the combustion chamber.
    • maximum power output
  • Ceramic composite cylinder bore is a “liner less” design with the ceramic coating sprayed directly on the aluminum block.
    • reduced weight (no heavy iron liner)
    • reduced friction
    • extended cylinder life
    • excellent heat dissipation for consistent power delivery
  • Specially designed combustion chamber achieves a more complete burn at higher rpm.
    • class leading power
  • Lightweight, flat top forged aluminum piston.
    • excellent durability
    • light weight means fast engine response
    • matches combustion chamber design for maximum power delivery
  • Lightweight, ball bearing style crank.
    • lightweight design for fast throttle response
    • friction reducing crank seals
  • Compact crankcases.
    • lightweight design
    • helps centralize mass
  • Quick-access, magnesium outer (sub) clutch cover.
    • light weight design
    • speeds clutch access
  • Close-ratio, 6-speed transmission uses optimized gear ratios.
    • 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
  • Yamaha’s patented YPVS system.
    • features a slide (guillotine) type power valve that provides the benefits of both solid, low-rpm power delivery combined with a strong top-end punch. This system varies the exhaust port height and timing based on engine rpm.
  • Mikuni TMXx38 carburetor features a “D” slide design.
    • enhances overall power delivery
    • provides crisp throttle response at all rpms
  • 6-petal, carbon fiber reed design.
    • for stronger high-rpm performance with greater over-rev capacity
  • 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 features a re-packable aluminum silencer which allows the rider / tuner to maintain the correct amount of back pressure for maximum engine performance while reducing noise.
  • Works-style clutch lever & race-spec “barrel adjuster.”
    • 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 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″).
    • fork adjustments include: 20-way compression damping & 20-way rebound damping
    • optional fork springs are available through Genuine Yamaha parts
    • low friction fork seals provide reduced stiction for a smoother stroke
    • 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
  • 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
    • 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.
  • New, larger, 270 mm floating front 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.
  • 245mm rear 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.
  • “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
  • Heavy-duty 520 gold anodized “O” ring chain
  • Rugged chain guide helps prevent the chain from de-railing & also helps protect the rear sprocket
  • Serrated rear brake lever & folding shift lever tip
  • Stainless steel, inner clutch cable provides excellent strength, smooth action & long life
  • E10 friendly fuel system components

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