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27 Май 2015 | Author: | Комментарии к записи Uncategorized Motortrend отключены
Sachs Big Roadster V 3.8

2007 Yamaha YZ250

The choice for racing.

When talking two-… 250 performance, the is clear: YZ250

Winning got easier …

The 2006 YZ250 was the winner of the 2006 Inside MX shootout. For 2007, we have the YZ250 for a little more enhanced suspension performance and weight. Out of the crate race include a lightweight Beta spring on the rear shock and new Pro handlebars.


• Liquid-cooled, piston-reed-valve-inducted, 2-… engine is and compact. Its reputation for exceptionally hard-hitting powerband will for 2007. The YZ250 won the 2006 Motorcycle MX 1 class shootout.

• The feature a ceramic composite which insures uniform dissipation, reduced friction and a service life.

• YPVS valve system features a of three slides (one and two auxiliary slides) which the benefits of both solid, low rpm delivery and a strong top-end The YPVS system varies the port height and timing on engine rpm. The valves are designed to match the curvature of the resulting in a strong seal, providing increased power

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

• Special-design, 4-petal, carbon reeds provide great response and engine performance the entire RPM range.

• Smooth-shifting, close-ratio transmission with multi-plate clutch ensures hook-up for outstanding acceleration and power. Transmission shafts involute splines for smooth, shifting.

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

• CD igntion system delivers spark and monitors engine to ensure optimal timing for stronger response during acceleration.

• Washable, dual-stage, air filter reduces maintanance

• Large-capacity, dual radiators a 10-row core with 4 to deliver maximum cooling

• Computer designed expansion provides maximum engine while the lightweight, aluminum is rebuildable so performance can be maintained at the level and noise levels can be

• Trick, works-style clutch features a race-spec “barrel for on-the-fly adjustability.


• aluminum, semi-double-cradle style was a completely new design in ’05. The benefit of an aluminum frame is a reduction in overall machine Yamaha has maintained the semi-double design because it offers an balance between stiff and torsion rigidity while more controlled flex in the plane.

This frame design the ideal “stiffness balance” means it offers the flexibility of a frame with the light of an aluminum frame. This is made from a unique mix of forgings and extrusions that stiffness where it is required and in other areas. The result is the lightest aluminum MX frame, provides excellent handling, ride quality, excellent and responsive cornering performance.

• rear subframe is constructed of lightweight aluminum pipe. design allows easy when servicing rear components.

• Lightweight, tapered, swingarm is produced using forming”, a special forming that uses high water to form shapes.

• aluminum upper triple and forged lower triple provide both lightweight and for fast, easy handling.

• The pitch (or separating width the tubes) has been optimized for responsive handling.

• Adjustable mounts allow the handlebars to be 10mm rearward if desired.

• sensitive 48mm, adjustable, Kayaba cartridge forks a twin-chamber design. The twin design means the damper is in a separate structure which aerated fork oil from the inner damper assembly and its damping abilities. Since the damper is pressurized, it also bubbles forming in the oil.

The speeds sensitive design the damping force is controlled by speed.

• The balance between the and outer fork tubes has optimized, while the Kashima on the pressure tank and the piston rod friction for smoother suspension The cylinder diameter is 24mm for primary cushioning while a low oil seal provides reduced

• Revised 48mm KYB fork a redesigned outer fork with optimized thickness and for superb handling. This also features a Transfer Valve (TCV). The TCV enhances the force of the inner damper mid … to full … and bottoming characteristics.

The benefit of TCV is precise control throughout the … range.

• “Kashima is applied to the fork tubes to friction for smoother suspension Front wheel travel is (11.8″).

• Front fork include: 20-way compression and 20-way rebound damping. fork springs are available Genuine Yamaha parts.

• semi-wrap-around plastic fork provide excellent protection stone / rock chips. The design helps to reduce for smoother fork operation.

• Monocross link rear system features a fully Kayaba, piggyback shock provides 315mm (12.4″) of travel and features separate for high- and low-speed compression There are numerous internal changes inside the shock Aluminum has replaced steel in the sub tank and shock body for weight.

Adjustments include: spring 20-way rebound damping, low-speed compression damping and 2 of high speed compression The damper rod diameter is 18mm in while Kashima coating is in the shock body and sub tank to friction and improve suspension during a long moto. The Kayaba shock utilizes a rebound oil lock system for suspension function and great quality.

• Super lightweight, titanium shock spring. spring reduces weight by 500 grams versus a conventional spring. A reduction in “unsprung” causes a dramatic effect on performance.

This titanium provides outstanding strength, and combined with reduced

• 250mm floating front brake utilizes a twin caliper with aluminum for excellent brake feel and The front brake lever has been revised for better

• 245mm rear disc with single piston uses an integrated master (fluid reservoir is integrated the top of the master cylinder) for strong power with excellent and control.

• The rear brake caliper a rugged plastic caliper while the lower edge of the is protected by a lower disc

• Specially designed “Sun rear sprocket increases the area between the sprocket and rollers, thereby reducing the on the chain and increasing the service of both chain and sprocket.

• 21″ front and 19″ rear Excel provide exceptional durability and reduce unsprung weight for suspension performance and handling.

• designed rear wheel is tapered to allow for faster, wheel removal installation.

• All new Pro Taper handlebars with crossbar and foam pad provide durability and reduced weight.

• Dunlop knobby tires excellent race-spec traction.

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

• Seat, handlebar and fuel ergonomics provide excellent of movement for the rider.

• New lightweight front axle nut reduces

• Large fuel cap and filler ensures easy opening and hassle-free refueling.

• Lightweight, wide titanium provide excellent grip and clearance.

• Cleated, rear lever and folding shift tip offer superb grip and durability.

• Stainless steel, clutch cable provides strength and long life.

• exhaust silencer means a can maintain optimum engine and reduced noise levels.

Engine 2-…, liquid-cooled, single

Displacement 249cc

and Stroke 66.4 x 72mm

Ratio 9.1


Maximum 4.84 kg-m (35 ft-lbs.) @ rpm

Suspension (Front) adjustable inverted fork

Suspension Fully adjustable link

Brakes (Front) 250mm disc

Brakes (Rear) disc

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