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

Carburetor

 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

Chassis

  • 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

Suspension

  • 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

Wheels

  • Features 17” wheels like its larger supersport brothers

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

Brakes

  • 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


Ergonomics

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

Bodywork

  • 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


 
Motorcycles are unique as compared to automobiles due to their incredible speed, and the lack of protection that is afforded to the operator. Most of bigbikers and riders should always first initiative on insuring that they have motorcycle insurance policy. Additionally, many motorcycle owners are younger people with less driving experience. For these reasons, insurance companies are very careful when getting motorcycle insurance quote.

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