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| | | Detailed first look : 2008 Kawasaki Ninja 250R |  Written: 28/09/2007 : 11:31. Read 60263 times (38/day). | In the city or on twisty country roads, the lightweight, rider-friendly Ninja 250R is a blast to ride! With an engine character that can be fully exploited, a compact, easy-to-operate chassis and full-fairing supersport styling, this model was developed to offer street sport performance to riders of all skill levels.
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Powered by a 249 cm³ parallel twin, this lightweight Ninja is loaded with features such as a low seat height, low-effort controls and a comfortable riding position.
Lightweight handling, easy controllability and gutsy throttle response make the 250R fun to ride on city streets. For great handling and high stability it runs 17-inch wheels. 2-piston disc brake delivers plenty of stopping power. Like Kawasaki’s other sport models, the Ninja 250R is fitted with petal discs for efficient heat dissipation.
Engine
Carburettor (EX250J: USA/CAN/AUS)
Settings for the twin Keihin CVK30 carburettors were idealised for good power feel with low fuel consumption.
Fuel injection / Dual throttles (EX250K: EUR/JAP)
* Fine-atomising (8-hole) injectors with a droplet size of 60 µ contribute to mid- and high-rpm throttle response.
* Like the Ninja ZX-6R, the Ninja 250R features dual throttle valves for responsive power across the rev range, smooth, linear throttle response and good fuel consumption. Throttle body size is 28 mm.
* Ignition system based on that of the ER-6n/6f offers high durability and reliability. Plugmounted coils deliver a hot spark while saving space.
Cylinder head
* Idealised intake and exhaust ports contribute to good off-idle response and smooth power delivery.
* Direct valve actuation ensures reliable high-rpm operability.
* Valves with thin heads and stems reduce reciprocating weight.
* Valve timing and lift were designed for low- and mid-range torque.
Piston / Cylinder
* Pistons feature reinforced heads and strengthening in the pin boss area for increased durability. (Longitudinally) thick piston rings help minimise oil consumption.
* Combustion chamber design optimises the squish area, maximising combustion efficiency and thereby reducing emissions.
Exhaust system
* The 2-into-1 exhaust system contributes to low- and mid-range torque and helps achieve the Ninja 250R’s smooth, step-free power curve.
* Slightly upswept silencer underwent extensive testing to determine chamber division ratios and connecting pipe length and diameter. The result is reduced noise with minimum power loss.
* Dual catalysers, one in the collector pipe, one in the silencer, ensure strict emissions are met. Locating the first catalyser as close to the exhaust ports as possible maximises its efficiency. Using two catalysers enables power loss to be minimised. (Carburetted models features pipe catalysers; fuel injected models use honeycomb catalysers.)
Transmission / Clutch
* Involute splines reduce friction and backlash between gears and shafts for easier gear
meshing and ensure smooth shifting under power.
* Spring-type clutch damper contributes to a smooth clutch feel, reducing jerkiness at very low
speeds and minimising shocks when rolling on and off the throttle.
* Paper-base friction plates contribute to durability.
Cooling
* Latest generation Denso radiator offers superior cooling performance while minimising space and weight.
* Noise-reducing ring-fan is operated by quiet-running print motor that also contributes to space savings.
* Fins on the lower side of the crankcase further contribute to engine cooling.
Mechanical noise reduction
* Cam chain tensioner like that used on our KX450F motocrosser features an automatic adjuster with threads and springs. The system automatically eliminates mechanical noise caused by a loose cam chain, reducing power-robbing friction loss.
* The air cleaner features a complex construction with reinforcing ribs that help eliminate reverberation, for reduced intake noise. Extensive testing to determine the diameter, length and thickness of the intake ducting ensures efficient filling.
Additional features
* Air cleaner element can be accessed from the side, facilitating replacement.
RIDER-FRIENDLY CHASSIS
Sturdy frame and swingarm provide a strong, rigid base for the Ninja 250R. Front and rear suspension with firm settings and 17” wheels complete a smooth, rider-friendly package that offers confidence-inspiring stability at both high and low speeds.
Frame / Swingarm
* Diamond-style frame of thick-walled steel tubing is both strong and durable.
* Beefy swingarm bracket contributes to the frame’s rigidity and helps achieve an ideal chassis stiffness balance.
* Attractive square-tube swingarm with a 60 x 30 mm cross-section further contributes to rigidity.
Wheels / Tyres
* The Ninja 250R features 17” wheels like its larger supersport brothers. Wide rims support lowprofile tyres. Rims measure 17xMT2.75 (front) and 17xMT3.50 (rear).
* Sporty, low-profile tyres contribute to easy, neutral handling at low speeds.
Suspension / Brakes
* 37 mm telescopic front fork contributes to the Ninja 250R’s smooth, stable handling. Firm settings keep pitching motion to a minimum.
* Uni-Trak rear suspension provides great road holding ability and bump absorption. The rear shock features 5-way adjustable preload, enabling ride height to be maintained whether riding solo or with a passenger.
* Petal disc brakes, just like our Ninja supersport models, offer excellent heat dissipation and contribute to the Ninja 250R’s top-class looks.
* Large-diameter, 290 mm front disc gripped by a balanced action two-piston caliper offers excellent braking performance and natural, direct feeling at the lever.
* At the rear, a two-piston caliper grips a 220 mm disc.
Instrumentation
* Attractive instrument panel features an easy-to-read large-face analogue speedometer. Other instrumentation includes an analogue tachometer, odometer, trip meter and warning lamps. This item is not very stylish and new. It looks like a cheap part...
* Carburetted models also feature a fuel gauge.
Additional features
* Two helmet holders are 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 tie-down points for securing
items to the rear of the bike.
Specifications
ENGINE
Engine type Liquid-cooled, 4-stroke Parallel Twin
Displacement 249 cm³
Bore x stroke 62.0 x 41.2 mm
Compression ratio 11.6:1
Valve/Induction system DOHC, 8 valves
Fuel system Carburettor: Keihin CVK30 x 2 (EX250J)
Fuel injection: ø28 mm x 2 (Keihin),
dual throttle valves (EX250K)
Ignition Digital
Starting Electric
Lubrication Forced lubrication, wet sump
DRIVETRAIN
Transmission 6-speed, return
Final Drive Sealed chain
Primary reduction ratio 3.087 (71/23)
Gear ratios: 1st 2.600 (39/15)
Gear ratios: 2nd 1.789 (34/19)
Gear ratios: 3rd 1.409 (31/22)
Gear ratios: 4th 1.160 (29/25)
Gear ratios: 5th 1.000 (27/27)
Gear ratios: 6th 0.893 (25/28)
Final reduction ratio 3.214 (45/14) (EX250J)
3.071 (43/14) (EX250K)
Clutch Wet multi-disc, manual
FRAME
Frame type Tube diamond, steel
Wheel travel, front 120 mm
Wheel travel, rear 130 mm
Tyre, front 110/70-17 M/C (54S)
Tyre, rear 130/70-17 M/C (62S)
Rake/Trail 26° / 83 mm
Steering angle, left / right 35° / 35°
SUSPENSION
Suspension, front 37 mm telescopic fork
Suspension, rear Bottom-Link Uni-Trak with gas-charged shock and
5-way adjustable preload
BRAKES
Brakes, front Single 290 mm petal disc.
Caliper: Single balanced actuation dual-piston.
Brakes, rear Single 220 mm petal disc.
Caliper: Dual-piston.
DIMENSIONS
Dimensions (L x W x H) 2,080 mm x 710 mm x 1,115 mm
Wheelbase 1,390 mm (EX250J)
1,400 mm (EX250K)
Ground Clearance 135 mm
Seat height 780 mm
Dry weight 151 kg (EX250J)
152 kg (EX250K)
Fuel capacity 18 litres (EX250J)
17.5 litres (EX250K)
PERFORMANCE
Maximum power 23.5 kW {32 PS} / 11,000 rpm (EX250J)
22.2 kW {30 PS} / 10,500 rpm (EX250K)
Maximum torque 21.7 N·m {2.21 kgf·m} / 10,000 rpm (EX250J)
21.0 N·m {2.14 kgf·m} / 8,500 rpm (EX250K)
Press release from Kawasaki
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