249 cm3 LIQUID-COOLED,
DOHC Parallel Twin Engine |
Designed for rider-friendly response,
the Ninja 250R's engine was tuned to
deliver smooth, step-free power.
Riders who use the full range of the
engine will be pleasantly surprised by
the ample high-rpm performance.
To enable riders to enjoy their bike for a
number of years, many of the engine
features contribute to durability and
reliability. |
|
Carburettor (EX250J only) |
| Settings for the twin Keihin CVK30
carburettors were idealised for good
power feel with low fuel consumption. |
|
Fuel injection / Dual throttles |
Fine-atomising (8-hole) injectors with a
droplet size of 60μ 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 Honeycomb 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. |
|
Transmission / Clutch |
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 Honeycomb 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. |
|
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. |
|
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.
|
|
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. |
|
Suspension |
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. |
|
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. |
|
Brakes |
* Petal disc brakes, just like the 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. |
|
Ergonomics |
* With its slightly forward-slanting seat and
wide, raised handlebars, the Ninja 250R
offers a natural riding position.
* Attention to detail when it came to the
rider interface mean that even the feel of
buttons were carefully designed to be
pleasant to the touch. |
|
Supersport Styling |
The Ninja 250R features styling that would
not be out of the Ninja supersport models.
The striking full-fairing bodywork has a
superb fit and finish that looks as good up
close as it does from a distance. |
|
Bodywork |
* Large-volume bodywork gives the 250R
the appearance of a super sport machine.
* Forward-leading lines hint at this model's
sporty character.
* Front cowling and windscreen offer the
rider a substantial amount of wind
protection.
* Aggressive dual-lamp headlight design
contributes to the Ninja 250R's sharp
image.
* Slim tail cowl and separate seats further
enhance the supersport look.
* Optional single seat cover can replace
the tandem seat for an even more
aggressive image.
* Fit and finish is on par with that of Ninja
supersport models. |
|
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. |
| |