Almost everything was redesigned for less weight, even
if only by a few grams. The shifter and pegs are new for
Almost every part is new, resulting in
a total loss of 7 pounds. The lithium
battery accounts for 2. 2 pounds of
that loss but has the drawback of
poorer performance in cold weather.
KTM250sX f FACTORY EDITION
EVERYTHING IS NEW
Aside from a few nuts and bolts, there’s only one thing
that’s the same as on the standard 2015 250SX-F. It’s a
250 four-stroke with an electric starter and a very sophisticated double-overhead-cam design with four titanium
valves that are opened by finger followers. The goal of
rethinking every single part was to reduce weight. The
standard 250SX-F is 229 pounds without fuel. In truth,
it isn’t that heavy. Despite carrying around an electric
starter, it’s the same weight as the Kawasaki KX250F and
the Suzuki RM-Z250. But, KTM engineers found plenty of
places where the bike could lose a gram or two. The new
engine is 6mm shorter and has a connecting rod that’s
6mm shorter, making the whole engine 6mm shorter. The
crank was moved rearward and upward to provide for
more centralized mass. The Keihin throttle body is completely new. It’s more compact, does away with throttle
linkage and is 100 grams lighter. It also has a new CPU
with electronic launch control and alternate fuel/advance
maps that can be selected with a handlebar toggle switch.
The generator lost another 100 grams. The cams lost 150
grams. The cylinder lost 130 grams, and the piston lost 10
grams. In the transmission, the KTM lost an entire gear;
it’s now a five-speed, whereas in 2014 it was the only six-
speed in the class. The gears themselves are wider but no
heavier, with material trimmed from strategic locations.
The shifting mechanism is new. The clutch hub is new but
still uses coil springs and a hydraulic system for actuation.
The only place where KTM was able to lose a lot of weight
in one step was the battery. The lead-acid battery was
replaced with a lithium-ion unit that weighs 2. 2 pounds
less. KTM also paid attention to where the weight was
carried. The new muffler is 40mm shorter and was moved
The chassis got the same gram-by-gram weight-loss
treatment. The chromoly steel frame lost 280 grams and
has more torsional rigidity with less longitudinal stiffness.
The subframe lost 250 grams, and the swingarm lost
another 250 grams. The airbox, footpegs, shifter and triple
clamps are all new and all lighter. Even the rear shock has
a new body that, despite being 12mm shorter, provides
10mm more travel because of the revised linkage.