2010 Kawasaki KX250F

2010 Kawasaki KX250F These are some pictures and wallpaper

2010 Kawasaki KX250F

Factory-style components and tuning for every racer

Kawasaki's KX'250F motocrosser had a victorious year, winning on the track and topping its class in numerous enthusiast magazine shootouts. The successful mix of the highly rigid aluminum frame and top-shelf suspension components deliver superb high-speed stability, while its chassis geometry and high-revving engine offer excellent rear wheel traction and holeshot-winning performance. Christophe Pourcel used his new Monster Energy/ Pro Circuit / Kawasaki KX250F to win the AMA East Supercross Lites Championship and then continued his winning ways into the outdoor season. But in the volatile world of racing, it's a constant challenge to stay on top.

To ensure it continues its podium-topping tradition, Kawasaki fine-tuned the light handling KX250F for 2010. The engineers capitalized on its solid foundation, with refinements focused on increasing performance and longevity. The result of their labors will help the Kawasaki KX250F add to its ever-growing trophy collection.

Borrowing from the racing world, the Kawasaki motor KX250F gets a new piston with a bridged-box bottom making its first appearance in a mass-production machine. The new piston is lighter and stronger. It also has a revised profile with a shorter skirt and shorter piston pin, which reduces reciprocating weight. It also features a revised crown that improves combustion. The cylinder height was raised accordingly to maintain the 13.2:1 compression ratio. Low-rpm performance was bumped up via a new longer head pipe and shorter mid-section on the new, more durable stainless steel exhaust pipe.

The 249cc, liquid-cooled, four-stroke engine received a number of other refinements for 2010, such as electrofusion treatment on the cylinder bore, revised oil pump rotors and a wider big-end bearing to increase engine life.

Its crank web design produces a crankshaft balance factor of close to 60 percent, on par with Kawasaki's factory racers. The result is reduced engine vibration, smoother power delivery and increased performance in the mid-high rpm range. Tuned to deliver the widest possible torque band, the Kawasaki-KX250F engine offers traction in a controllable, class-leading manner from the first crack of the throttle to wide-open at the rev limiter.

Like its bigger sibling, the KX250F received larger, stronger radiators with increased fin and tube pitch that accumulate less mud and provide more consistent cooling. With the extra strength in the new radiators, the reinforcing brackets could be dropped, helping reduce the weight of the entire radiator assembly.

Transmission durability was also raised inside and out. Building upon the achievements of last year, Kawasaki engineers put larger dogs on the third and fourth input gears to help prevent wear, and revised the fourth input gear holding method by eliminating a circlip and washer and changing the shape of the second input gear to reduce thrust clearance. On the outside, the new KX250F crankcases are stronger and thicker with increased material around the engine mount holes. The transmission action and feedback are optimized with its ratchet drive shift mechanism and integrated clutch cable holder into the crankcase.

With its lightweight construction blend of forged, extruded and cast parts, the KX250F's slim aluminum perimeter frame has the chassis balance and settings race-experienced riders seek. The center of gravity and locations of key items such as the swingarm pivot, output sprocket and rear axle were positioned to best channel the drive from the rear tire into forward acceleration.

For 2010, chassis improvements are primarily focused on delivering sharper cornering performance and an optimized front-to-rear balance for improved suspension composure. To achieve this balance, the race-oriented suspension settings were revised for a more balanced less forward-leaning chassis posture when riding. A new steering stem with lower rigidity helps lighten handling, while also providing smoother fork action and better impact absorption.

These revisions refine the stable damping performance of the KX250F's Showa twin-chamber fork during long motos and work in conjunction with the updated swingarm, which features a modified cross-section with thinner wall thickness and narrower internal ribs. The Showa rear shock's new damping settings provide greater stability and less "kicking" on corner entry. New Uni-Trak rear suspension linkage ratios match these new rear shock damping characteristics.

Designed with rider ergonomics in mind, the KX250F bodywork offers riders a slim interface and a natural positioning that make it easier to go fast. The sleek bodywork components include one-piece, dual injected, two-tone black and green plastic shrouds and side number plates. The shrouds were fine-tuned to fit the new radiators while retaining their slender form. For 2010, a thicker and more rigid front fender graces the KX250F. The slim, rider friendly seat with a non-slip top surface and smooth sides provides excellent seated grip and rider mobility, and gets firmer urethane foam to hold its shape longer.

Chassis protection is grade-A for 2010, and helps sustain the KX's durability factor. Examples include the large, resin skid plate, the rear caliper guard and the narrow, long-lasting chain guide, all of which offer protection without high weight.

The rest of the KX250F is equally impressive, with premium-quality Renthal aluminum handlebars included as standard equipment along with black triple clamps, engine covers and hubs. The new black alumite coated lightweight aluminum wheels feature a revised cross section that offers both increased strength and lighter weight, and the ribless rear hub and butted spokes further reduce unsprung weight. Factory-style graphics finish off the package and complement the KX250F's stellar on-track performance.

Racers who ride their KX250F at designated events are eligible to receive support from Team Green, Kawasaki's amateur racing support program. Each year, Team Green provides regional support vehicles and highly trained technicians at more than 100 events throughout the United States, offering technical information and assistance to those who race Kawasaki products. Kawasaki also offers a comprehensive contingency program for amateur and professional riders who place well at designated events.

Already ranked at the top of its class in numerous enthusiast magazine shootouts, further fine-tuning of the KX250F’s engine and chassis ensures its winning performance is maintained for 2010.

Authentic Kawasaki Accessories are available through Kawasaki dealers.

Engine

A hot start system gives quick starts when the engine is hot. The hot start lever is unitised with the clutch lever.

NEW - Increased spring set load for the auto-decompressor located on the exhaust cam shaft contributes to easier starting

Additional performance-oriented engine characteristics

The engine was tuned such that the torque curve follows the limit of running resistance for as long as possible.(Unchecked, engine torque can exceed this limit, resulting in wheel spin, which does nothing to help forward momentum.)

Efforts were made to achieve the widest possible torque band, so that traction efficiency would be maximized for a greater part of the rev range.

Lightweight titanium valves (IN: 31mm; EX: 25 mm) reduce reciprocating weight and offer high-rpm reliability. The ultra-light valves have extremely thin valve stems on par with those found in supersport machines. The intake valves feature thicker heads for increased strength and both intake and exhaust valves are formed from a new, highly rigid, titanium material.

Crank web design increases offsetting moment for a high crankshaft balance factor. At close to 60%, the balance factor of the '10 KX250F is on par with our factory racers. The result is reduced engine vibration, smoother power delivery and increased performance in the mid-high rpm range.

Sprocket-style chain drive roller helps smooth engine braking by reducing the effect of driveline lash when the rider gets off the gas quickly and play in the lower side of the chain suddenly tightens. The additional control facilitates corner entry.