The stock A-arms on this machine have
been chromed and equipped with Elka
shocks. The stockers were horrible and
not worth rebuilding unless you are
going for a full restoration.
Duncan Racing has a complete line
of engine modifications for this and any
two-stroke. Here they installed a cool
head, better carburetor and modern
❏ If you go to an ATV dealership
or even check out the manufacturers’ websites these days, it looks like
high-performance sport quads are
sort of fading away. While sales of
brand-new quads may be rebounding at only half the speed of the
economy, people are still riding them
in large numbers. Look at your local
ride area and racetrack; in some
cases, things are as good as they ever
have been. Everything from modern
four-strokes to old two-stroke quads
and even three-wheelers are out
and about enjoying this great sport.
Furthermore, businesses are still
thriving, building more motors, main-
taining current models and restoring
older two-strokes. We recently had a
couple of California-based compa-
nies—Duncan Racing and The Dirt
Factory—bring out their showcase
two-stroke machines for us to take a
spin on in Glamis.
Duncan Racing has been in the
ATV business since ATVs have been
around. Sure, the company has
evolved with the times and continues
to develop components for modern
ATVs. Two-strokes are by no means
a small part of the sales. Duncan
remains the go-to ATV engine performance shop in the San Diego area.
It’s the closest shop to the world’s
largest ATV sand box, Glamis.
Duncan’s immaculate Suzuki LT500
has been featured a handful of times
in Dirt Wheels and is the perfect exam-
ple of what kind of work they can do
for clients all over the world. It fea-
tures one of the National kits, which
includes a Paul Turner pipe and one
of the original Fat Boy 2 silencers. On
the intake side is where Duncan’s
expertise gets displayed even more.
Decades ago they developed a
clamp-on air-filter setup that was way
better than stock. Some people like to
keep these old machines original, but
we and Duncan both feel you have to
make some improvements to fix the
flaws that the manufacturers made.
Furthermore, Duncan includes in the
kit the new Pyramid reed valve and a
big 39mm Keihin carburetor.
With a rich racing heritage, Duncan
has provided top riders all over the
world solutions for more than just
the motors. For this chassis, Duncan