■ 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

 

 

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