2018 Yamaha YZ125 (2-Stroke)

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Availability
Brochure
Year
2018
Manufacturer
Yamaha
Model
YZ125 (2-Stroke)

Overview

Description

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.



Power: Liquid-cooled, 124cc, crankcase reed valve-inducted 2-stroke engine provides class leading power and acceleration. It's easy to service too!



Performance: Ceramic composite cylinder bore is a "liner less" design with the ceramic coating sprayed directly on the aluminum block. The benefits include reduced weight (no heavy iron liner), reduced friction, extended cylinder life and excellent heat dissipation for consistent power delivery.

Specifications
  • Engine: 2-stroke, liquid-cooled, crankcase reed-valve, single
  • Displacement: 125 cc
  • Bore and Stroke: 54.0 x 54.5 mm
  • Compression Ratio: 8.6~10.7:1
  • Fuel Delivery: Mikuni TMX x 38
  • Ignition / Starting: CDI / Kick
  • Transmission: 6-speed
  • Final Drive: Chain
  • Suspension (Front): Adjustable 48 mm inverted fork / 300 mm (11.8 in.) wheel travel
  • Suspension (Rear): Fully adjustable link Monocross / 315 mm (12.4 in.) wheel travel
  • Brakes (Front): 270 mm floating disc / twin piston caliper
  • Brakes (Rear): 245 mm disc / single piston caliper
  • Tires (Front): 80/100-21
  • Tires (Rear): 100/90-19
  • Length: 2,135 mm (84.1 in.)
  • Width: 825 mm (32.5 in.)
  • Height: 1,295 mm (51 in.)
  • Wheelbase: 1,445 mm (56.9 in.)
  • Ground Clearance: 365 mm (14.4 in.)
  • Seat Height: 975 mm (38.4 in.)
  • Fuel Capacity: 8 L (1.8 imp. gal)
  • Wet Weight: 94 kg (207 lb.)
  • Colour(s): Yamaha Racing Blue
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
  • 270 mm front & 245 mm rear disc brakes
  • Aluminum handlebar & titanium foot pegs
  • Aggressive, modern styling
Engine Features
  • 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: easy lever pull; for on-the-fly clutch adjustments
  • Works-style clutch lever & race-spec "barrel adjuster.": easy lever pull; for on-the-fly clutch adjustments
Chassis/Suspension Features
  • 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.
  • 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: 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
  • 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: increases the contact area between the sprocket & chain rollers; reduces the load on the chain & increases service life of chain & sprocket
  • "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
NOTES:
Every attempt has been made to showcase Canadian versions of our products, but all images, information and specifications may not be exact and are subject to change without notice. Some models may be shown with optional accessories.

Specs

Engine

Engine Type
2-stroke, liquid-cooled, crankcase reed-valve, single
Displacement
125 cc
Bore and Stroke
54.0 x 54.5 mm
Cooling
Liquid
Compression Ratio
8.6~10.7:1
Fuel System
Mikuni TMX x 38
Ignition
CDI

Chassis

Front Suspension
Adjustable 48 mm inverted fork / 300 mm (11.8 in.) wheel travel
Front Brakes
270 mm floating disc / twin piston caliper
Front Tire
80/100-21
Rear Suspension
Fully adjustable link Monocross / 315 mm (12.4 in.) wheel travel
Rear Brakes
245 mm disc / single piston caliper
Rear Tire
100/90-19

Dimensions

Dry Weight
Curb Weight: 94 kg (207 lb.)
Fuel Capacity
8 L (1.8 imp. gal)
Wheelbase
1,445 mm (56.9 in.)
Ground Clearance
365 mm (14.4 in.)
Seat Height
975 mm (38.4 in.)

Transmission

Transmission
6-speed
Final Drive
Chain

General

Colors
Yamaha Racing Blue

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