( 2) The overall engine weight is an amazing 4 pounds
( 3) We doubt that an electric starter is in the 125SX’s
immediate future, but the engine cases have been designed
for the possibility. We can’t wait until that day comes.
( 4) The laundry list of additional changes includes a
new cylinder, piston, two-piece head, crankshaft, six-speed
transmission and redesigned power valve.
Q: WHAT ELSE IS NEW ON THE 2016 KTM
A: The following upgrades were made not only to the
125SX but also to the 450SXF, 350SXF, 250SXF and 150SX.
They are brand-specific changes rather than model-specific.
(1) Bodywork. All the bodywork—from head to tail—is
totally new. The front number plate incorporates the front
brake-hose holder. The seat is lower and flatter. KTM’s
engineers even added an embossed sag-line indicator on
the rear fender to help riders get accurate sag measurements. The bodywork was designed for performance, not
( 2) Radiators. The WP-built radiators are redesigned
to be more efficient, allowing for better air flow and lower
temperatures. The radiator guards don’t just knock down
roost but also provide structural rigidity to the radiator. No
need for aftermarket radiator braces.
( 3) Brakes. The Galfer Wave rotors have been updated
with lighter rotors. The modulation characteristics of the
to reduce dirt buildup in the hinge, which keeps them
( 7) Triple clamps. The CNC-machined triple clamp
offset remains at 22mm, but the handlebars are now
rubber-mounted to reduce vibration at the handlebars.
The top clamp has the ability to adjust the bars forward
( 8) Airbox. The no-tools airbox has been updated to
be even simpler, and the filter is the first-ever plug-and-play design. Every bike should have one.
( 9) Fork settings. The quick-adjust WP 4CS fork
settings have been updated and use softer fork springs—
from 4. 4 N/m to 4. 2 N/m.
( 10) Shock. The 125SX gets the latest-generation WP
shock. It features a revised reservoir, new piston, new
shock shaft and new clevis design that shortens the
shock length by 12mm. The linkage is also an all-new
design to fit the architecture of the new frame.
Q: WHAT CHANGES DID KTM MAKE TO THE
A: The goals for KTM in developing the 2016 125SX
engine were to reduce weight, scale it down and improve
performance. Virtually nothing is interchangeable with
the 2015 model. The major changes are as follows:
(1) The clutch shaft is 27mm higher and the crankshaft
was raised by 37mm in order to make the engine more
2016 KTM 125SX: At 198
pounds the KTM 125SX is light
as a feather. Thanks to its
awesome brakes, clean design
and impressive horsepower
the 125SX is fun personified.