11 NEW THINGS ON THE 2015 KX250F
1. The 249cc motor receives a new, reinforced,
Bridged Box piston borrowed directly from the factory
race bikes. The light and strong Bridged Box piston
design for the KX250F has short skirts with reinforced
external ribs for increased strength. The added ribs
increase the weight of the new piston, but a lighter
piston pin helps offset the additional weight.
2. The exhaust system gets a shorter head pipe
equipped with a resonance chamber to enhance
low-end power. The KX250F uses the KX450F’s
high-volume muffler to assist with mass centralization
and makes better top-end power. The pipe is AMA
Amateur legal at 94 decibels.
3. The ECU system has a new magneto rotor with
greater inertia to match the increased acceleration
performance. The standard rotor now weighs 9. 5 kg/
cm, which is up from 9 kg/cm on the 2014 model.
4. Kawasaki’s Dual-Fuel (DFI) injection system
utilizes two injectors that deliver a second squirt
of fuel under acceleration to maximize the engine’s
power. For 2015, the four-hole injectors have been
revised, with the upstream injector dispersing 120ºm
droplets, while the downstream injector’s droplet size
has been reduced to 75ºm. With a finer droplet size
and wider spray pattern, the downstream injector
contributes to a stronger low- to mid-range power.
5. The Launch Control System returns for 2015,
helping to ensure holeshot supremacy. The push-button activator retards ignition timing in first and
second gears, which, in turn, maximizes traction.
Once the rider shifts into third, normal ignition
mapping is resumed and full power returns.
6. For 2015, the Showa Separate Function Fork (SFF)
has new valving. These are not air forks; instead,
they have a coil spring in the right fork leg and oil
damping in the left leg. The SFF forks have a super-hard titanium coating on the inner fork tubes. Green-anodized caps and a new silver finish on the outer
fork tube complements the package.
7. The Showa shock has firmer settings to match
the front fork upgrades. The shock features high- and
low-speed compression damping and a self-lubricating,
alumite coating on the inner surface of the shock
cylinder wall to resist abrasions, reduce friction and
smooth the suspension action.
8. Kawasaki has upped the ante for 2015 with a
270mm, oversized, petal-shaped front brake rotor to
replace last year’s 250mm front rotor. It is paired with
a 240mm Braking rear rotor.
9. The lighter rear subframe is shared with the
10. The 2015 KX250F has a new, four-position upper
triple clamp with two sets of handlebar mount slots.
These offer the rider the choice of four bar positions,
including 25mm forward, 15mm forward, standard or
10mm back. Plus, the KX250F borrows the two-position, adjustable footpeg brackets from the KX450F.
The footpegs can be lowered 5mm on the frame.
11. The 2015 KX450F look is highlighted by
factory-style graphics, green engine plugs, oil cap
and generator cover plugs, as well as green alumite
suspension adjusters and black alumite wheels. ❏