Standard Features
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NEW YZ125 2-Stroke .

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 four-strokes. A larger 270 mm front disc brake highlights the 2017 improvements. D30702 Stock ya Frt/pdi $695 + doc $195 and up . Yz yz125 yz-125 125 cr kx125 150sx 125sx


Model Year
YZ125 (2-Stroke)
Retail Price
Yamaha Racing Blue
Stock Number
Additional Pricing Info
+ $695 Freight & PDI + documentation $195 and up


84.1 in. (2,135 mm)
51 in. (1,295 mm)
32.5 in. (825 mm)
207 lbs. (94 kg) wet
Ground Clearance
14.4 in. (365 mm)
56.9 in. (1,445 mm)
Seat Height
38.4 in. (975 mm)


2-stroke, crankcase reed-valve, single
7 ci
Bore x Stroke
54 x 54.5 mm
Compression Ratio
8.6 ~ 10.7:1
Fuel System
Mikuni TMX x 38
Fuel Tank Capacity
1.8 imp. gal. (8 l)


Final Drive


Front: 270 mm floating disc / twin-piston
Rear: 245 mm disc / single-piston
Front: 80/100-21
Rear: 100/90-19


Front: Adjustable 48 mm inverted fork; 11.8 in. (300 mm) travel
Rear: Fully adjustable link Monocross; 12.4 in. (315 mm) travel

Standard Features

Key Improvements for 2017
 Larger 270 mm front disc brake with wave-style rotor & twin piston caliper  
Key Features
 Easy to service, liquid-cooled, 124 cc, 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  
 Liquid-cooled, 124 cc, 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" 48 mm, adjustable, inverted, "twin chamber" KYB fork. Front wheel travel is 300 mm (11.8 in.).  
    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 315 mm (12.4 in.) 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.  
 245 mm 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 in. front and 19 in. 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.  
 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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