2007 yz 250

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2007 Yamaha YZ250
2007 Yamaha YZ250

2007 Yamaha YZ250
2007 Yamaha YZ250

2007 Yamaha YZ250
2007 Yamaha YZ250

2007 Yamaha YZ250
2007 Yamaha YZ250

2007 Yamaha YZ250
2007 Yamaha YZ250

– 2007 Yamaha YZ250

2007 Yamaha YZ250

The only choice for racing.

When you’re talking two-stroke 250 performance, the choice is clear: YZ250

Winning just got easier …

The 2006 YZ250 was the unanimous winner of the 2006 Inside Motorcycle MX shootout. For 2007, we have tweaked the YZ250 for a little more power, enhanced suspension performance and reduced weight. Out of the crate race “goodies” include a lightweight Beta titanium spring on the rear shock and new Pro Taper handlebars.


FEATURES:

– Liquid-cooled, 249cc, piston-reed-valve-inducted, 2-stroke engine is lightweight and compact. Its reputation for exceptionally broad, hard-hitting powerband will continue for 2007. The YZ250 won the 2006 Inside Motorcycle MX 1 class shootout.

– The cylinder feature a ceramic composite coating which insures uniform heat dissipation, reduced friction and a longer service life.

– 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. The valves are also designed to match the curvature of the cylinder resulting in a strong seal, thereby providing increased power delivery.

– Revised Keihin PWK38 carburetor with power jet and throttle position sensor (TPS) ensures precise fuel/air mixing and extra-crisp throttle response throughout the powerband. The needle jet is changed for improved low to mid rpm power delivery.

– Special-design, 4-petal, carbon fiber reeds provide great throttle response and engine performance across the entire RPM range.

– Smooth-shifting, 5-speed, close-ratio transmission with heavy-duty, multi-plate clutch ensures optimal hook-up for outstanding acceleration and corner-exiting power. Transmission shafts utilize involute splines for smooth, positive shifting.

– Quick-access, outer clutch cover provides allows for fast, easy clutch maintenance

– Digital CD igntion system delivers precise spark and monitors engine speed to ensure optimal timing for faster, stronger response during hard acceleration.

– Washable, dual-stage, foam air filter reduces maintanance costs.

– Large-capacity, dual radiators feature a 10-row core with 4 louvers to deliver maximum cooling efficiency.

– Computer designed expansion chamber provides maximum engine performance while the lightweight, aluminum silencer is rebuildable so performance can be maintained at the optimum level and noise levels can be controlled.

– Trick, works-style clutch lever features a race-spec “barrel adjuster” for on-the-fly adjustability.

CHASSIS/SUSPENSION

– Lightweight, aluminum, semi-double-cradle style frame was a completely new design in ’05. The obvious benefit of an aluminum frame is a significant reduction in overall machine weight. Yamaha has maintained the semi-double cradle design because it offers an excellent balance between stiff lateral and torsion rigidity while offering more controlled flex in the longitudinal plane. This frame design offers the ideal “stiffness balance” which means it offers the flexibility of a steel frame with the light weight of an aluminum frame. This frame is made from a unique mix of castings, forgings and extrusions that provide stiffness where it is required and flexibility in other areas. The result is the world’s lightest aluminum MX frame, which provides excellent handling, good ride quality, excellent stability and responsive cornering performance.

– Removable rear subframe is constructed of square-section, lightweight aluminum pipe. Detachable design allows easy access when servicing rear suspension components.

– Lightweight, tapered, aluminum swingarm is produced using “hydro forming”, a special forming method that uses high pressure water to form shapes.

– Cast aluminum upper triple clamp and forged lower triple clamp provide both lightweight and strength for fast, easy handling.

– The fork pitch (or separating width between the tubes) has been optimized for lightweight, responsive handling.

– Adjustable handlebar mounts allow the handlebars to be moved 10mm rearward if desired.

– Speed sensitive 48mm, adjustable, inverted, Kayaba cartridge forks feature a twin-chamber design. The twin chamber design means the damper unit is in a separate structure which prevents aerated fork oil from entering the inner damper assembly and degrading its damping abilities. Since the inner damper is pressurized, it also eliminates bubbles forming in the oil. The speeds sensitive design mean the damping force is controlled by piston speed.

– The balance between the inner and outer fork tubes has been optimized, while the Kashima coating on the pressure tank and the piston rod reduce friction for smoother suspension performance. The cylinder diameter is 24mm for improved primary cushioning while a low friction oil seal provides reduced stiction.

– Revised 48mm KYB fork features a redesigned outer fork tube with optimized thickness and rigidity for superb handling. This fork also features a Transfer Control Valve (TCV). The TCV enhances the damping force of the inner damper from mid stroke to full stroke and improves bottoming characteristics. The benefit of TCV is more precise control throughout the full stroke range.

– “Kashima coating” is applied to the fork tubes to reduce friction for smoother suspension performance. Front wheel travel is 300mm (11.8″).

– Front fork adjustments include: 20-way compression damping and 20-way rebound damping. Optional fork springs are available through Genuine Yamaha parts.

– Large, semi-wrap-around plastic fork protectors provide excellent protection from stone / rock chips. The “self-supporting” design helps to reduce friction for smoother fork operation.

– Revised Monocross link rear suspension system features a fully adjustable, Kayaba, piggyback shock which provides 315mm (12.4″) of wheel travel and features separate adjusters for high- and low-speed compression damping. There are numerous internal material changes inside the shock body. Aluminum has replaced steel components in the sub tank and shock body for reduced weight. Adjustments include: spring preload, 20-way rebound damping, 20-way low-speed compression damping and 2 turns of high speed compression damping. The damper rod diameter is 18mm in diameter, while Kashima coating is used in the shock body and sub tank to reduce friction and improve suspension performance during a long moto. The 2007 Kayaba shock utilizes a full rebound oil lock system for excellent suspension function and great ride quality.

– Super lightweight, “Beta” titanium shock spring. This spring reduces weight by over 500 grams versus a conventional steel spring. A reduction in “unsprung” weight , causes a dramatic effect on suspension performance. This titanium spring provides outstanding strength, and durability, combined with reduced weight.

– 250mm floating front disc brake utilizes a twin piston caliper with aluminum pistons for excellent brake feel and control. The front brake lever shape has been revised for better feeling.

– 245mm rear disc brake with single piston caliper uses an integrated master cylinder (fluid reservoir is integrated into the top of the master cylinder) for strong stopping power with excellent feel and control.

– The rear brake caliper features a rugged plastic caliper protector, while the lower edge of the disc is protected by a lower disc guard.

– Specially designed “Sun Star” rear sprocket increases the contact area between the sprocket and chain rollers, thereby reducing the load on the chain and increasing the service life of both chain and sprocket.

– Lightweight, 21″ front and 19″ rear Excel rims provide exceptional durability and help reduce unsprung weight for optimal suspension performance and handling.

– Specially designed rear wheel collar is tapered to allow for faster, easier wheel removal installation.

– All new lightweight Pro Taper handlebars with reinforcing crossbar and foam pad provide excellent durability and reduced weight.

– Premium Dunlop knobby tires offer excellent race-spec traction.

DETAILS

– “Flat-design” seat features multi density foam that provides good initial softness / comfort and then increases the firmness as more pressure is applied. The “pebble” or “gripper” finish on the top and side surfaces provides excellent rider grip and durability.

– Seat, handlebar and fuel tank ergonomics provide excellent freedom of movement for the rider.

– New lightweight aluminum front axle nut reduces weight.

– Large fuel cap and filler hole ensures easy opening and fast, hassle-free refueling.

– Lightweight, wide titanium footpegs provide excellent grip and ground clearance.

– Cleated, rear brake lever and folding shift lever tip offer superb grip and exceptional durability.

– Stainless steel, inner clutch cable provides excellent strength and long life.

– Repackable exhaust silencer means a rider can maintain optimum engine performance and reduced noise levels.



SPECIFICATIONS:

Engine 2-stroke, liquid-cooled, reed-valve, single
Displacement 249cc
Bore and Stroke 66.4 x 72mm
Compression Ratio 9.1~10.9:1
Maximum Torque 4.84 kg-m (35 ft-lbs.) @ 7,500 rpm
Fuel Delivery Keihin PWK38S
Ignition CDI
Transmission Constant mesh, 5-speed
Final Drive Chain


Suspension (Front) adjustable 48mm inverted fork
Suspension (Rear) Fully adjustable link Monocross
Brakes (Front) 250mm floating disc
Brakes (Rear) 245mm disc
Tires (Front) 80/100-21
Tires (Rear) 110/90-19


Length 2,186mm (86.1″)
Width 827mm (32.6”)
Height 1,309mm (51.5”)
Wheelbase 1,485mm (58.5”)
Ground Clearance 386 mm (15.2″)
Seat Height 992mm (39.1”)
Dry Weight 96kg (211.2 lbs)
Fuel Capacity 8 litres (1.8 imp. gallons)
Colour(s) Yamaha Blue


MSRP*

Canada: $7,899

USA: $6,299 (Team Yamaha Blue/White) Available from July 2006

*Price and specifications subject to change without notice.
Please read your Owner’s Manual and all labels before operation.

Sours: https://www.totalmotorcycle.com/photos/2007models/2007models-Yamaha-YZ250

The YZ250 is a 2-stroke motocross race bike made by Yamaha. It was launched in the 1970s, and has been regularly updated since. It is slowly being phased out and replaced by its more powerful four stroke rival, the YZ450.

The YZ250 was extensively redesigned for 2005, so has received mostly chassis updates for 2007, including revised Kayaba 48mm front forks as per the YZ450FF and YZ250F.

The legendary two-stroke Supercross winner is now more potent than ever. A light, aluminum frame housing a patented YPVS power-valve-equipped ripper of an engine results in an awesome power-to-weight ratio.

Winning just got easier. Out of the crate race "goodies" include a new ProTaper aluminum handlebar, titanium footpegs, gripper seat, Excel rims and a lightweight Beta titanium spring on the rear shock.

Features


New for 2007
Modified thickness of both inner and outer fork tubes and revised damping settings.
Rear shock lightened by the use of aluminum components. Revised settings complement the changes in the fork.
A lightweight and strong Pro Taper aluminum handlebar in adjustable mounts adds comfort and control.
New jet needle in the 38mm Keihin PWK carburetor increases bottom-end and mid-range response.
Lighter box-head bolts are used throughout the chassis to ease maintenance and reduce weight.

Engine

249cc liquid-cooled, reed valve-inducted two-stroke engine is lightweight, compact and features an incredibly wide, hard-hitting powerband.
Patented YPVS power valve system combines crisp, hard-hitting bottom-end acceleration with strong midrange and eye-opening top-end.
Special-design carbon fiber reed-valve pedals improve throttle response and engine performance across the entire rpm range.
Smooth-shifting, five-speed, close-ratio transmission with heavy-duty, multiplate clutch.
Primary kickstarter ensures smooth, easy starting action and reduced weight.
Large-capacity radiator features a ten-row core with four louvers for maximum cooling efficiency.
38mm Keihin PWK carburetor with power jet and throttle position sensor (TPS) ensure precise fuel/air mixing and extra-crisp throttle response throughout the powerband.
Digital CDI ignition system delivers precise spark for faster, stronger response anywhere in the powerband.
Trick, works-style clutch lever features race-spec barrel adjuster for on-the-fly adjustability.

Chassis/Suspension

A carefully engineered, advanced aluminum frame and swingarm give the YZ250 the best handling in the 250 class.
Speed-Sensitive System 48mm Kayaba fork tubes move the transfer control valves (TCV) above the fork springs, so that damping force is controlled by piston speed instead of position. Along with a bigger base valve hole, the result is a smooth ride and super-precise handling.
Removable aluminum rear subframe constructed of square-section tubing for reduced weight.
Rear, fully adjustable Kayaba shock features a super-light titanium shock spring and reduced-friction Kashima coating of internals. 12.4 inches of travel, separate adjusters for high- and low-speed compression damping, and a full lock oil rebound system for increased comfort all add up to fantastic rear wheel control and a sweet ride.
Lightweight front and rear calipers with aluminum pistons and anti-bubble front master cylinder, 250mm fully floating front and 245mm rear discs, deliver strong stopping power with progressive feel.
Lightweight 21-inch front and 19-inch rear Excel rims provide exceptional durability and help reduce unsprung weight for optimal suspension performance and handling.
Tapered rear wheel spacers ease sliding the rear wheel into place, for quicker tire changes.
Premium Dunlop knobbies offer race-spec traction and wear.

Additional Features

Wide, cleated, folding titanium footpegs are lightweight and provide excellent comfort, grip and ground clearance.
Special-design “gripper” type seat and fuel tank, forward-canted steering crown and low handlebar provide excellent movement and more comfortable ergonomics for riders.
Wide-diameter fuel tank cap ensures easier usage, while larger tank opening means faster, hassle-free refueling.
Cleated rear brake lever and folding shift lever tip offer superb grip and exceptional durability.
Repackable exhaust silencer.
Durable, comfortable handlebar grips.
Stainless steel clutch cable for longer life.


SPECS


Engine
Type: 249cc liquid-cooled 2-stroke; reed-valve inducted
Bore x Stroke: 66.4 x 72.0mm
Compression Ratio: 9.2 – 10.9:1
Carburetion: PWK38S X 1
Ignition: CDI
Transmission: Constant-mesh 5-speed; multiplate wet clutch
Final Drive: Chain Drive

Chassis
Suspension/Front: Speed-Sensitive System inverted fork; fully adjustable, 11.8" Travel
Suspension/Rear: Fully adjustable single shock, 12.4" Travel
Brakes/Front: Hydraulic single disc brake, 250mm
Brakes/Rear: Hydraulic single disc brake, 245mm
Tires/Front: 80/100-21-51M
Tires/Rear: 110/90-19-62M

Dimensions
Length: 85.7"
Width: 32.6"
Height: 51.4"
Seat Height: 39.1"
Wheelbase: 58.3"
Ground Clearance: 15.0"
Dry Weight: 211.6 lb.
Fuel Capacity: 2.1 gal.

Other
Main Jet: #178
Main Air Jet: #200
Jet Needle: N3EW-2
Needle Jet: 2.9
Pilot Air Jet 1: #50
Pilot Outlet: 0.8
Pilot Jet: #50
Primary Reduction Ratio: 63/21 (3.000)
Secondary Reduction Ratio: 50/14 (3.571)
Gear Ratio - 1st Gear: 27/14 (1.929)
Gear Ratio - 2nd Gear: 23/15 (1.533)
Gear Ratio - 3rd Gear: 23/18 (1.278)
Gear Ratio - 4th Gear: 24/22 (1.091)
Gear Ratio - 5th Gear: 20/21 (0.952)
Warranty: 30 Day (Limited Factory Warranty)
MSRP: $6,299 (Team Yamaha Blue/White)

About the author
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Yamaha : YZ 2007 yz 250 yz 250 two stroke excellent condition pro circuit

Yamaha : YZ 2007 yz 250 yz 250 two stroke excellent condition pro circuit

$3,800

Downers Grove, Illinois

Category Off Road Motorcycles

Engine 250 two stroke

Posted Over 1 Month

2007 YZ 250 two stroke Excellent condition 5hrs on fresh top end Pro taper bars Moose brake levers Braided steel brake lines Pro circuit pipe & silencer Carburetor rejeted Vforce3 intake Factory connection suspension Brand new Renthal sprockets Brand new Renthal brake pads Braking wave rotor Brand new DID gold chain Works Connection radiator braces Adult ridden never raced

Trim YZ250

Yamaha : YZF 2006 2009 yamaha yz 250 f complete rear sub frame

Yamaha : YZF 2006 2009 yamaha yz 250 f complete rear sub frame

$125

Toms River, New Jersey

Category Motocross Bikes

Engine -

Posted Over 1 Month

This is a listing for a complete rear sub-frame for a 2006-2009 Yamaha YZ250F. There is no damage to the sub frame, however it is used.... it will bolt right up to replace your broken subframe if that happens to be your issue. It is used like I said but there is absolutely nothing wrong with it, other than some minor cosmetic,,,, Yamaha OEM Part #: 2S2-21190-70-00... on MotoSport.com and related sites, I've seen this subframe list for $400.00 - $500.00 - and I really haven't seen any cheap subframes out there for sale. So why buy new? save yourself some money by purchasing this one....

Trim YZ250F

2007 Yamaha YZ250

2007 Yamaha YZ250

$1,999

Orlando, Florida

Category -

Engine -

Posted Over 1 Month

2007 Yamaha YZ250, 2007 Yamaha YZ250 Key Features May Include Our legendary two-stroke Supercross winner is more potent than ever. Winner of "Cycle World", "Racer X" and "Motocross Action" shootouts. A light, aluminum frame housing a patented YPVS power-valve- equipped ripper of an engine results in an awesome power-to-weight ratio. Ready to race out of the crate, complete with new ProTaper aluminum handlebar, titanium footpegs, gripper seat and Excel rims Features & Benefits New for 2007 Modifying thickness of both inner and outer fork tubes and revising damping settings provides fantastic bump absorption and comfort while shaving weight. Lightening the rear shock with aluminum components takes offmore weight, and revised settings complement the ones in the fork. A light and strong ProTaper aluminum handlebar in adjustablemounts adds comfort and control. A new jet needle in the 38mm Keihin PWK carburetor boostsbottom- end and mid-range response. Use of lighter, box-head bolts throughout the chassis easesmaintenance while reducing weight and increasing performance. Engine 249cc liquid-cooled, reed valve-inducted two-stroke engine is lightweight, compact and features an incredibly wide, hard-hitting powerband. Patented YPVS power valve system combines crisp, hard-hitting bottom-end acceleration with strong midrange and eye-opening top- end. Special-design carbon fiber reed-valve pedals improve throttle response and engine performance across the entire rpm range. Smooth-shifting, five-speed, close-ratio transmission with heavy-duty, multiplate clutch. Primary kickstarter ensures smooth, easy starting action and reduced weight. Large-capacity radiator features a ten-row core with four louvers for maximum cooling efficiency. 38mm Keihin PWK carburetor with power jet and throttle position sensor (TPS) ensure precise fuel/air mixing and extra-crisp throttle response throughout the powerband. Digital CDI ignition system delivers precise spark for faster, stronger response anywhere in the powerband. Trick, works-style clutch lever features race-spec barrel adjuster for on- the-fly adjustability. Chassis/Suspension A carefully engineered, advanced aluminum frame and swingarm give the YZ250 the best handling in the 250 class. Speed-Sensitive System 48mm Kayaba fork tubes move the transfer control valves (TCV) above the fork springs, so that damping force is controlled by piston speed instead of position. Along with a bigger base valve hole, the result is a smooth ride and super-precise handling. Removable aluminum rear subframe constructed of square-section tubing for reduced weight. Rear, fully adjustable Kayaba shock features a super-light titanium shock spring and reduce

2017 Yamaha YZ250

2017 Yamaha YZ250

$6,550

Thomaston, Connecticut

Category -

Engine -

Posted Over 1 Month

2007 YAMAHA YZF R1, FOR SALE IS A CLEAN 2007 YAMAHA YZF R1 HAS NEWER TIRES FRONT AND REAR, WINDSHIELD, CUSTOM EXHAUST, FLUSH MOUNT BLINKERS, CUSTOM PLATE MOUNT, FENDER ELIMINATOR KIT, ASV LEVERS. RUNS AND DRIVES GREAT,SERVICED, NEEDS NOTHING BUT A RIDER.WE FINANCE AND OFFER FREE LAYAWAY PLAINS. WE WANT YOUR BUSINESS. SUPERFLY MOTORSPORTS LLC838 NORTH MAIN STREETTHOMASTON ,CT 06787860 283-4100 OFFICE203 496-0828 CELL860 283-3522 FAX

2017 Yamaha YZ250

2017 Yamaha YZ250

$1,600

Pickerington, Ohio

Category -

Engine -

Posted Over 1 Month

The Yamaha Virago 250 cc, SOHC, 60 degree v-twin engine provides enough power for cruising around the streets, and can even get you around on the freeway while delivering 70 mpg. The bike is lightweight and that makes maneuvering at low speeds incredibly easy. The bike has low mileage and is in like new condition. It has a new "quiet" chain and luggage rack. No blemishes on the tank or chrome.

2017 Yamaha YZ250

2017 Yamaha YZ250

$2,795

North Kingstown, Rhode Island

THIS ADULT OWNED 2007 YAMAHA MAJESTY, HAS HEATED GRIPS, REAR DRIVERS BACK REST AS WELL AS GIVI LOCKABLE TOP CASE. LOTS OF STORAGE AND PLENTY OF POWER FOR THE OPEN RODE. GREAT WIND PROTECTION AND HEATED GRIPS MEAN LOTS OF RIDING SEASON LEFT.

2017 Yamaha YZ 250

2017 Yamaha YZ 250

$6,785

KCMO, Missouri

2007 YAMAHA ROAD STAR MIDNIGHT S, ONE OWNER Midnight Star Silverado - This ' LIKE NEW ' Silverado was purchased by it's original owner in Jan. 2008 from our Dealership - It has been Maintained to Perfection - Always Garage Kept - Adult Ridden and could easily be mistaken for NEW Midnight Star Silverado if placed back on the Show Room Floor today - If You wished you had purchased a Silverado before they were discontinued, now is your opportunity to own a $15,000 Classic for $6,785 - Ready for Delivery - Call Today - Ride Today !

2017 Yamaha YZ250

2017 Yamaha YZ250

$5,699

Zion, Illinois

Category -

Engine -

Posted Over 1 Month

Selling a unique and very beautiful 2007 Yamaha R6 with many upgrades. Runs strong, very well maintained and always garaged kept. All the fluids have been changed at the start of the season (May 2016). Bike has around 23K miles and a clean title.Upgrades are: -ECU Flash-Custom Paint-Shorty Levers-Brand New tires (less than 500 miles on them)-Shogun Frame sliders-Handle bar mirrors-Flush turn signals-Fender Eliminator-New Battery (put in July)-Includes a rear seat and passenger pegs (not shown in pic) Asking $5,699 serious buyers only (Cash in hand if you want to test drive)stands are NOT included

2017 Yamaha YZ - 250

2017 Yamaha YZ - 250

$7,995

Kingman, Kansas

2007 Yamaha Royal Star Venture, Smooth and comfortable. Loaded with AM/FM/CB, and electric cruise. Added highway pegs, drivers backrest and driving lights. Just in, has not been serviced yet.

2005 Yamaha Yz250

2005 Yamaha Yz250

$6,000

Pampa, Texas

9232 miles, Highway pegs, Sissy bar, 500 miles on new tires.

2013 Yamaha YZ250

2013 Yamaha YZ250

Request Price

La Marque, Texas

2007 Yamaha V Star 1100 Classic, 2007 Yamaha V Star 1100 Classic - ON THE RIGHT ROAD. You instinctively know a great cruiser when you see one. Spirited V-twin performance, of course, and cool style that's just begging for some choice personalization. It's all right here. 3-Day "no Questions Asked" Money Back Guarantee on all Certified used motorcycles purchased! Click here to learn more! To get internet pricing call Phillip Orange at 409-781-3035. Trades always welcome! Email us with your Trade. Financing offered. All Credit Applications Accepted. Call today for a credit app! Extended warranty available on most models. Please call 409-938-4820 for information. All Certified used motorcycles come with a limited powertrain warranty. Click here to learn more!

2013 Yamaha YZ250

2013 Yamaha YZ250

$3,500

Auburn, Alabama

Love it! Runs like a dream but I'm moving and gotta sell it. Make me an offer.

2013 Yamaha YZ250

2013 Yamaha YZ250

$2,300

Los Angeles, California

Category Scooters

Engine 400 cc

Posted Over 1 Month

16,000 miles, full service history provided, never crashed or dropped. Included helmet (large), lock and cover

2004 Yamaha YZ250

2004 Yamaha YZ250

$5,499

Traverse City, Michigan

Category Cruiser Motorcycles

Engine 1,670 cc cc

Posted Over 1 Month

IT COMES BY ITS REPUTATION HONESTLY. The big-bore air-cooled V-twin cruiser that has what it takes to be the bike you want it to be. Wild-hearted radical custom, lovingly polished stocker, or the look you know is just right for you.

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Riding a YZ250

Yamaha YZ250

YZ250.jpg
ManufacturerYamaha
Production1974-present
SuccessorYamaha YZ450F
ClassMotocross
Engine250 cc (15 cu in) water-cooled reed-valve two-stroke single
Transmission5-speed
SuspensionMonoshock, 12.8 inches travel
Brakesdouble disc
TiresFront: 80/100-21-51M ; Rear: 110/90-19-62M
Wheelbase1,470 mm (57.8 in)
DimensionsL: 2,200 mm (85 in)
W: 830 mm (32.5 in)
H: 1,300 mm (51.2 in)
Seat height990 mm (39.1 in)
Fuel capacity7.9 l; 1.7 imp gal (2.1 US gal)
RelatedYamaha YZ450F

The Yamaha YZ250 is a two-stroke motocross race bike made by Yamaha. The model was launched in 1974 and has been regularly updated, and is one of the only two-stroke bikes of this displacement still in production, with new releases every year.

Engine[edit]

The original YZ250 of 1974 used an air-cooled 250cc two-stroke engine of 70 mm bore and a 64 mm stroke, which was improved semi-annually. The air-cooled motor was replaced in 1982 with a 249 cc liquid-cooled two-strokereed-valved engine with a YPVS exhaust valve for a wider spread of power. The bore on the water-cooled engine was reduced to 68 mm and the stroke was increased to 68 mm producing a displacement of 247 cc. In 1999, the bore was further reduced to 66.4 mm and the stroke lengthened to 72 mm producing a displacement of 249 cc. The longer stroke engine resulted in a lower redline, slightly less top end power and greatly improved torque at lower RPM.The engine produces a peak 48.8 horsepower (36.4 kW) at 8,800 rpm and 30.6 foot-pounds force (41.5 N⋅m) of torque at 7,500 rpm, with a 9,000 rpm redline.[1]

Chassis[edit]

On its introduction in 1974, the YZ250 used a single backbone steel frame with a twin-shock swingarm. The following year, reflecting the factory racer Hakan Andersson's factory racer, the swingarm became a monoshock unit, initially made of steel, then aluminum from 1978. The swingarm rear suspension system featured more than 12" of travel, while the telescopic inverted front forks had 11.8 inches (300 mm) of travel.[2] In the 2005 model year the YZ250 gained a new frame made from aluminum that reduced the dry weight to approximately 212 lb (96 kg). All YZ250s feature front and rear hydraulic disc brakes.

Timeline[edit]

1999First year of the current engine
2002First year of the current frame geometry and bodywork
2003Exhaust port raised about 0.5mm and h-igher compression head for USA model.
2005Aluminium frame
2006KYB SSS forks
2007Pro Taper 1-1/8 Handlebars
2008Smaller fork lugs and shorter lower tubes. Brake calipers also reduced in size + wave rotors
2011No more US model: Bigger silencer and a neutral switch for sound checks. Low compression head.
2015New body work (compatible with 2002 - 2014 bikes) Smaller fork tubes (at top clamp) from the four stroke.

Racing[edit]

See also[edit]

References[edit]

Wikimedia Commons has media related to Yamaha YZ.
Sours: https://en.wikipedia.org/wiki/Yamaha_YZ250

250 2007 yz

2007 Yamaha YZ250 Dirt Bike Review - Dirt Rider Magazine

If all it takes is a new handlebar, some slight internal suspension adjustments and revised jetting inside the carburetor to keep a bike on top of the heap, that bike had better be really good. Oh yeah, and changing the head size on a few bolts as well. The YZ250 had the class covered last year, and we guess Yamaha was as hard-pressed deciding how to improve the bike as we were.It doesn't matter either way, because Yamaha hit the nail on the head with each of these changes, refining a really great bike. The standout to all of our riders was the motor. The YZ pulls from the basement to the top with an insanely crisp, smooth and linear powerband that made a fan of anyone who rode it whether they possessed a four-stroke bias or not. The new jetting completely eliminated the midrange detonation and made it even crisper than we remembered. Along with its quickness and controllability, it has a suddenness and responsiveness that four-strokes envy. And the clutch easily adds amplitude to the delivery. Spacing of the gearbox ratios is spot-on, and shifting is decent-just remember this bike craves clean tranny fluid and a properly adjusted clutch.The changes to the fork tube's diameter and internal valving yielded a very plush ride, one that was mirrored by the shock's performance. The YZ retains its very light feel, especially through the handlebar. While jumping, it flicks and whips so easily we want to make comparisons with 125s. It falls into turns effortlessly and tracks exceptionally well for a bike that never feels as planted as a thumper. If anything, it seems the springs were more heavily taxed (and at the end of their ability to get proper ride height with a 180-pound rider aboard), and the bike exhibited an extreme lightness on its feet. It was a little dicey when accelerating, and that prompted us to tighten the rebound slightly at both ends to allow the bike to settle better. And the additional flex of the ProTaper bar was welcome, especially on sharp hits.Fear not, the two-stroke isn't gone. And for most of us, this YZ's performance doesn't give up anything because of its engine type.Opinions
For the past few years, the Yamaha YZ250 has been my favorite two-stroke motocrosser. The '07 model is a refined '06 at best, but that is OK with me. The engine is a notable improvement. It pulls stronger and cleaner from lower in the rpm range, and it seems to have less violence to the hit. I'd still need to open up the riding position and install stiffer springs for it to suit my size and my riding preferences, but this bike is worth the effort. Now, if Yamie just made it in a 300...
Karel Kramer/6'1"/210 lb/Senior IntermediateTen years ago, when there was no such thing as a really good four-stroke, you could barely comprehend that there are now riders fearing the death of premix-burners. Hey, the blue guys still sell enough two-strokes to keep them around and keep them current. The two-stroke might not be a manufacturer's first priority any longer, that's all. KTM is all-in with a totally revised 250 SX, and going head-to-head with this YZ is the only way to tell how good it is going to be.
Jimmy Lewis/5'10"/180 lb/Vet Pro****Specifications
MSRP: $6299
Claimed dry weight: 212 lb
Actual weight (ready to race, no gas): 219 lb
Seat height: 38.1 in.
Seat-to-peg distance: 19.6 in.

  • Great throttle response.
  • The detonation is gone.
  • Really light and agile.
  • Not as planted as four-strokes.
  • You have to shift a lot.
Sours: https://www.dirtrider.com/tests/141_0611_2007_yamaha_yz250/
2007 Yamaha YZ250 Start Up \u0026 Walk Around

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