2018 Yamaha YZ250 (2-Stroke)

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Availability
Brochure
Year
2018
Manufacturer
Yamaha
Model
YZ250 (2-Stroke)

Overview

Description

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 2-stroke more affordable and easier to maintain, they also provide a very entertaining ride.



Power: Liquid-cooled, 249cc, piston-reed-valve-inducted, 2-stroke engine is lightweight and compact.



Performance: YPVS power valve system 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.

Specifications
  • Engine: 2-stroke, liquid-cooled, reed-valve, single
  • Displacement: 249 cc
  • Bore and Stroke: 66.4 x 72 mm
  • Compression Ratio: 8.9~10.6:1
  • 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 1.278 (23/18); 4th gear 1.091 (24/22); 5th gear 0.952 (20/21)
  • 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): 110/90-19
  • Length: 2,185 mm (86 in.)
  • Width: 825 mm (32.5 in.)
  • Height: 1,290 mm (50.8 in.)
  • Wheelbase: 1,485 mm (58.5 in.)
  • Ground Clearance: 360 mm (14.2 in.)
  • Seat Height: 970 mm (38.2 in.)
  • Fuel Capacity: 8 L (1.8 imp. gal.)
  • Wet Weight: 103 kg (227 lb.)
  • Colour(s): Yamaha Racing Blue
Key Features
  • Compact, liquid-cooled, 249cc, 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 Features
  • 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
  • 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, flat top forged aluminum piston: excellent durability; light weight means fast engine response
  • 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 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 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
  • Adjustable handlebar mounts: allow handlebar to be moved 10mm rearward if desired
  • Cast aluminum upper and forged lower triple clamps: strong yet lightweight; fast, agile handling
  • '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: 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
  • 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: increases the contact area between the sprocket & chain rollers; reduces the load on the chain & increases service life of chain & sprocket
  • 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
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, reed-valve, single
Displacement
249 cc
Bore and Stroke
66.4 x 72 mm
Cooling
Liquid
Compression Ratio
8.9~10.6:1
Fuel System
Keihin PWK38S
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
110/90-19

Dimensions

Dry Weight
Curb Weight: 103 kg (227 lb.)
Fuel Capacity
8 L (1.8 imp. gal.)
Wheelbase
1,485 mm (58.5 in.)
Ground Clearance
360 mm (14.2 in.)
Seat Height
970 mm (38.2 in.)

Transmission

Transmission
5-speed
Final Drive
Chain

General

Colors
Yamaha Racing Blue

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