Duncan Racing is also a distributor of the Vortex X10 ECU and ignition system. Vortex is an Australian
company that builds ECU and
ignition units for carbureted and
electronic fuel-injected machines
that are meant for closed-course
competition race use only. If there is
a full Duncan four-stroke race build,
you can bet it has a Vortex ECU or
Vortex ignition installed.
Leonard Duncan of Duncan
Racing International invited us
out to a closed course to test a
bone-stock, off-the-showroom 2017
Yamaha YFZ450R. The purpose
of this test was to experience the
power increase and rideability
of the YFZ-R by adding just a
Vortex X10 ECU system. Of course,
we couldn’t pass up a fun and
informative day with the race guru
THE VORTEX X10 ECU DO?
The Vortex ECU is designed to
make your fuel-injected four-stroke
ATV run the way it should. It’s pre-
programmed with 10 performance
fuel and ignition maps. Each setting
(0– 9) is changed by using a small
flat-head screwdriver to turn the
adjustment dial to the desired
power setting. In addition to fuel
metering, the X10 ECU also controls
spark timing and voltage output.
The result is more power, the
quad starts easier and eventually
turns faster lap times. There are
also three additional switches for
adjusting the fuel—low, mid and
high throttle openings. The X10 ECU
plugs directly into the quad’s OEM
wiring harness and interfaces with
all the standard engine sensors.
The X10 allows the quad to adjust
fuel and spark timing for optimum
power delivery in all weather,
altitude and load conditions.
Typically, the power gains are
most easily felt in high-rpm power
and bottom-end throttle response,
which means smoother, more
rideable power. The X10 is also
fully programmable by purchasing
software at an additional cost. This
means if you’re a mad computer
scientist and understand the
mechanics of a race engine, you
can create some crazy maps.
The best thing about the Duncan Racing performance mods that were added to the YFZ-R is
that it gave us more confidence in our riding and in the machine over rough terrain.
The Duncan Racing Fat Boy 4 full-exhaust
system has the looks and sound of a winner.
We felt big power gains with this and the Pro
Design air filter kit installed.