The pipe is new. The radiators are new. The rider layout
is different, and all the bodywork has changed. KTM actually weighed the bike at its press conference, back to back
with a standard 2015 450SX-F. The Factory Edition was a
full 10 pounds lighter. That would make it the lightest bike
in the 450 MX class, despite being the only one with an
KTM 450SX-F FACTORY EDITION
What Ryan Dungey wants, Ryan Dungey gets, and he
wanted a lighter, more compact bike. The motor is 23mm
smaller in both length and width, and KTM engineers
worked to centralize the rotating mass of the crank and
clutch. “Mass centralization” is the buzz phrase of recent
times at Honda and Yamaha, but this is the first time we’ve
heard KTM use the term. The idea is to make the bike feel
even lighter than it is. The motor has a new Keihin 44mm
throttle body and a redesigned engine-management system. The rider will have the option of several engine maps,
including a Kawasaki-like launch control for moderating the
power delivery off the start line.
The head is completely new, although it remains a
single-overhead-cam design. The cylinder is 6mm shorter,
and that results in a shorter cam chain and shorter cam
chainguides. The crankshaft, on the other hand, got larger.
It’s said to have a 10-percent increase in inertia, which can
be attained through increases in weight, circumference or
both. The gearbox and clutch hub were targeted for weight
reduction, and the bike comes stock with a lithium battery
that weighs only 1.1 pounds.
Marvin Musquin is a factory-backed KTM rider along with
Justin Hill. Troy Lee will manage a satellite KTM team.
KTM FAC TORY
KTM FAC TORY