By Winston “Boss” McKannick
RZR WITH A JAZ FOR BAJA
I am setting up a RZR to do some
desert racing. I plan on installing a
JAZ fuel cell. I have several ques-
tions, like do I need a return line?
And, what is the operating pressure
of the stock fuel pump? I was planning on using an electric pump.
Recommendations for a fuel cell?
Can the factory fuel rail handle an
aftermarket electric fuel pump?
Salt Lake, UT
Well, in fuel cells, I, too, prefer a
Jaz. Contact them here: www.jaz
products.com/store. Yes, you will
need a return line. An electric fuel
pump can be used over your stock
pump; however, there is some
debate over using an external fuel
pump because of vapor-lock issues,
whereas the stock pump is liquid
cooled inside the fuel tank. Be
sure to install a fuel filter between
the fuel cell and the fuel pump to
ensure the pump gets nothing but
clean fuel. The factory fuel rail will
be fine. Fuel pressure should be
43. 5± 2 psi.
WHY WON’T A CLEAN POLARIS
My son likes to ride our Polaris
Ranger in the mud. I won’t let him
ride it again until it is clean, so he
pressure-washes it. This last time it
has never run right since. Hard to
start, skips, sputters and it is down
on power. Boss, do you know what
This isn’t the first time I have seen
this problem with Polaris Rangers.
Your problem is your son is too thor-
PREMIX OR INJECTION, VHS OR
ough with the pressure washer. See,
Polaris runs the fuel tank vent hose
up inside a frame member. If your
son sprayed the pressure wand into
that frame tube, water was forced
into the fuel tank. Siphon out your
fuel tank and refill with fresh, clean
fuel. Remove the end cap off the
fuel rail/line and turn the key on
and off a few times until all you see
is pure gas coming out. Pour a can
of dry gas into the fuel tank. Get
it running and operate it until any
remaining water is sucked through
the system and burnt. I suggest in
the future you give your son a buck-
et of soapy water, a sponge and a
BETA, DVD OR LASER DISC?
I bought a used 2003 Yamaha
Blaster for a good price and I real-
ly like it. My quad came with an
oil tank and oil-injection system.
Some of the two-stroke dirt bike
riders I know say it’s best to remove
this and run premix oil in the gas
instead. What do you think? Is that
better than the oil-injection system?
Did quads like the Banshee and
Honda 250R have oil injection or
not? Thanks for your advice.
Son, you are not going to drag
me into the age-old debate of injection or premix. No matter which
side I take—and back it up with
facts—people will take me to task
because they had a friend, brother
or sister who heard about it from
some guy that had their two-stroke
burn up with oil injection. Or, the
injection system was removed and
the machine has never run better.
“They” know what “they” know
because they know it! And don’t
confuse them with the facts!
Here is some historical background, son: Originally, all two-strokes ran on premix. And, the oil
was a petroleum-based premix-rat-ed oil that never really burned
clean. They also came equipped
with atrocious ignitions that had
so little electrical energy that they
could barely jump a 0.020-inch
spark-plug gap. This fouled spark
plugs at low speeds. With the
advent of oil-injection systems, the
de rigueur 20:1 oil-to-gas ratio was
only fed to the engine at full throttle.
At idle, where 20:1 would foul spark
plugs, the injector pump fed only a
120:1 oil ratio. Why? Because there
is little load on a two-stroke engine
at idle, but at full throttle that 20:1
ratio is needed to keep the thing
from seizing up.
Again, back in the day, there
were three distinct kinds of two-
Got a problem with your ATV?
Send your questions to Dirt
Wheels “Dialed In,” P.O. Box 957,
Valencia, CA 91380-9057. Our
e-mail address is dwdialed@
hi-torque.com, and include your
name, city and state address.
stroke oil: premix rated, injector
rated and premix and injector rated.
And between different makes of
two-strokes with injectors, they recommended different weight injector
oils. So, use the wrong oil type, the
engine seizes; use the wrong weight
oil and the engine seizes. And they
did! This is where the legend of the
unreliable oil-injection system got
its start. And, it persists even today,
even though snowmobiles, personal
watercraft and street motorcycles
with two-stroke engines have used
injectors for decades. Now, to bring
us up to today, we have electronic ignitions that rarely foul spark
plugs because they actually have
some electrical energy to jump the
spark-plug gap in most any oil/
gas mix. Also two-stroke oils have
gotten much better. Petroleum oils
burn cleaner, and the synthetic oils
burn very clean. These modern two-stroke oils also provide exceptional
boundary lubrication at extremely
So, to answer your question,
250Rs and Banshees were billed
as racers, and injection systems
were never considered for them.
If you are intent on using premix,
then you can mix your gas with oil
from 32:1 to as lean as some yahoo
claimed he runs his two-stroke! No
matter what the premix ratio, you
will feed your Blaster’s engine too
much oil at idle and a bit lean at
full throttle. However, people get
away with it everyday because of
the cleaner-burning, better-lubricat-ing two-stroke oils available today
and the more powerful ignition
systems keeping spark-plug fouling
to a minimum. One final factoid
to really confuse you: A leaner oil
ratio equals a richer gas-to-air ratio.
That means the more oil you add to
your gas, the hotter the engine runs
because of the leaner jetting. As
you have noticed, son, you are not
getting my advice; I’m too smart for
that. All I will give you are “just the