Wednesday, July 20, 2011

■ 2010 Kawasaki Ninja 250R

The Kawasaki Ninja 250R (previous generations had market-specific names) is a motorcycle originally introduced by Kawasaki in 1983. As the marque's entry-level sport bike, The motorcycle has undergone few changes throughout its quarter-century lifetime, having received only two substantial redesigns.

The fourth-generation model is marketed as the Ninja 250R in all markets. The motorcycle is also referred to by its platform designation, EX250, to which a generational suffix is attached. In the United States, previous generations of the bike (EX250-E/F/G/H) were already being marketed as members of the Ninja family of sport bikes, while outside of the U.S. the bike was known variously as the ZZR-250, ZX-250, or as the GPX-250R. One of the earliest generations, the EX250-C, was given the name GPZ-250.
The Ninja 250R's particular ergonomics, chassis design, and engine placement have resulted in a motorcycle that straddles the standard and sport classes. The Ninja's riding posture also falls somewhere between standard and sport.

The bike is capable of running the quarter mile in 15.58 s @ 81.98 mph (131.93 km/h), although it had been 1 s faster in the prior generation, while providing the amenities of more utilitarian motorcycles, including bungee hooks for transporting cargo and space for a second passenger.
From: Wikipedia, the free encyclopedia

 Engine and Transmission
  • Engine: Four-stroke, liquid-cooled, DOHC, parallel twin

  • Displacement: 249cc

  • Bore x stroke: 62.0 x 41.2mm

  • Compression ratio: 11.6:1

  • Maximum torque: 22 Nm 2.24 kgf/m 16.2 lb-ft / 9,500 rpm

  • Cooling: Liquid

  • Carburetion: Keihin CVK30 x 2

  • Ignition: Digital

  • Transmission: Six-speed

  • Final drive: O-ring chain

Chassis and Dimensions

  • Frame: Semi-double cradle, high-tensile steel

  • Wheelbase: 55.1 in.

  • Rake / trail: 26 degrees / 3.2 in.

  • Front suspension / wheel travel: 37mm hydraulic telescopic fork / 4.7 in.

  • Rear suspension / wheel travel: Bottom-Link Uni-Trak® with 5-way adjustable preload / 5.1 in.

  • Front tire: 110/70-17

  • Rear tire: 130/70-17

  • Front brake: Single 290mm hydraulic petal disc with two-piston caliper

  • Rear brake: Single 220mm petal disc with two-piston caliper

  • Overall length: 82.1 in.

  • Overall width: 28.1 in.

  • Overall height: 43.7 in.

  • Seat height: 30.5 in.

  • Curb weight: 374.9 lbs.

  • Fuel capacity: 4.8 gal.

DOHC 249cc Parallel Twin-cylinder Engine

  • Compact parallel-twin design offers good mass centralization for superior handling

  • Tuned to deliver smooth, step-free power with an emphasis on low- and mid-range power for rider-friendly response

  • Pistons feature reinforced heads and strengthening in the pin boss area for increased durability

  • Thick piston (longitudinally) rings help prevent oil consumption

  • Combustion chamber design optimized to maximize combustion efficiency and reduce emissions

  • Ample highrpm performance will please riders using the full range of the engine

Cylinder head

 Intake and exhaust ports contribute to good off-idle response and smooth power delivery
  • Valve timing and lift designed for strong low- and mid-range torque

  • Direct valve actuation helps ensure reliable high-rpm operability

  • Thin heads and stems on valves for reduced reciprocating weight


 Fine-tuned twin Keihin CVK30 carburetors offer good power feel and low fuel consumption

Reduced mechanical noise

  • Automatic adjusting cam chain tensioner eliminates mechanical noise caused by a loose cam chain and reduces power-robbing friction loss

  • Eliminating mechanical noise allows the use of a freer flowing exhaust for a better performance

  • Complex construction with reinforcing ribs helps eliminate airbox reverberation and reduce intake noise

  • Air filter accessible from the side, for easy replacement

Exhaust system

  • 2-into-1 system contributes to the Ninja 250R’s low- and mid-range torque and smooth, step-free power curve

  • Slightly upswept silencer extensively tested to determine chamber size, connecting pipe length and diameter to achieve least noise and most power

  • Meets strict emissions with dual catalyzers; one in the collector pipe and the other in the silencer

  • Using two catalyzers minimizes the power loss

  • Positioning the first catalyzer as close to the exhaust ports maximizes its efficiency as well

Liquid Cooling

  • Latest generation Denso radiator offers superior cooling with minimal space and weight

  • Ring-fan uses a quiet-running motor that also saves space

  • Fins on the lower side of the crankcase further helps cool the engine

Six-speed Transmission / Clutch

  • Involute splines reduce friction and backlash between gears and shafts for easier gear meshing and smooth shifting under power

  • Spring-type clutch damper reduces jerkiness at very low speeds and minimizes shocks when rolling on and off the throttle for a smoother clutch feel

  • Paper-base friction plates help increase clutch durability


  • Sturdy and durable diamond-style frame of thick-walled steel tubing offers confidence-inspiring stability at both high and low speeds

  • Beefy swingarm bracket contributes to the frame’s rigidity and helps achieve an ideal chassis stiffness balance

  • Square-tube swingarm with a 60 x 30mm cross-section further adds to rigidity


  • 37mm telescopic front fork with firm settings contribute to the Ninja 250R’s smooth, stable handling and enhanced ride control

  • UNI-TRAK® rear suspension compliments the rigid frame and provides great road holding ability

  • Rear shock features 5-way adjustable preload, enabling ride height to be maintained whether riding solo or with a passenger


  • Features 17” wheels like its larger supersport brothers

  • Low-profile sportbike tires on wide rims contribute to its easy, neutral handling at low speeds


  • Large-diameter, 290mm front petal disc and a balanced action two-piston caliper offers excellent braking performance and a natural, direct feeling at the lever

  • Two-piston caliper grips the rear 220mm petal disc


  • Natural riding position with slightly forward-slanting seat and wide, raised handlebars


  • Styling, fit and finish of striking full-fairing bodywork match its Ninja supersport siblings

  • Aggressive dual-lamp headlight design, slim tail cowl and separate seats further enhance the supersport look

  • Front cowling and windscreen offer the rider a substantial amount of wind protection

  • Two helmet holders conveniently located under the rear seat

  • Under-seat storage can hold a U-lock or similar device

  • Two hooks under the tail and the rear passenger pegs provide anchor points for securing items to the rear of the bike

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