Frame builders and even garage
mechanics started stuffing YZ400F and
a variety of other engines into TRX250R
geometry frames. The new four-stroke
engines were pumping out some serious torque and had horsepower rivaling
or surpassing modified production two-stroke quad engines, blowing the doors
off the mighty 400EX. For quads, this
was a turning point in what they would
eventually become, and manufacturers
eventually answered the call with new-age production models.
It seems odd to think that the sport
ATV market is in the slump that it’s
currently in when it had its greatest
years starting in 2003 with the LT-Z400
and following that with the YFZ and
TRX450R in 2004. Now here we are with
Yamaha being the last game in town
for production sport ATV models. We
keep hoping that companies like Honda,
Suzuki and KTM will jump back in, but
currently, that’s just a dream. However,
ATV racing will persevere like it has in
the past, but for now, it will go back to
the grass roots and more self-built rac-
ers will emerge.
From what we’ve learned from the
past, it’s time for a new age of outlaw
quads and hybrids to start making an
appearance in the racing scene. One
of the companies ready for the change
is Rath Racing. We had a serious discussion with owner and pro rider Daryl
Rath about building a quad with a KTM
or Husqvarna 450 four-stroke engine
back in September 2016. He took the
bait and created this KTM 450SX-F
Factory Edition hybrid quad!
NOTHING WAS SPARED,
Because Daryl loves the Yamaha
frame geometry, he started out with a
YFZ450R donor frame that he acquired
from one of his sponsored pro riders.
It turns as well as the Suzuki LT-R450
and has a light aluminum frame. Also,
being that it is still being produced,
there are no issues with parts supply.
With a chassis to base the project on,
Rath Racing went big and purchased a
brand-new 2017 KTM 450SX-F Factory
Edition dirt bike. The reason for that is
that the 450SX-F FE engine is one of the
lightest and most potent engines on the
market. Daryl kept the engine, wiring
harness and hydraulic clutch assembly,
then he sold the rolling dirt bike chassis.
He then created all the necessary engine
The map switch on the handlebar allows the user to select different fuel/power maps, traction
control and launch control.