The Polaris ProStar engine is the first
double-overhead-cam powerplant used
by the company. Now the 570 RZR has
a version, and we expect to see one in
an ATV very soon. It works well and has
tons of potential for modifications.
In the engine compartment more dif-
ferences are found. The RZR S 800 is
actually only a 760cc powerplant, while
the XP 900 boasts 875cc. Along with the
size difference, the XP’s engine is a far
better design for making maximum
power. While both have twin cylinders,
the XP has dual overhead cams, and
the RZR S has less sophisticated
pushrods and rocker arms to operate
the valve train. Polaris claims the XP
900 puts out 88 horsepower, while the
RZR S puts out about 60 horsepower.
On the trails those differences do
amount to an advantage for the XP.
On our test track, relying on a Trail
Tech Voyager GPS unit, we recorded
can hammer any quad or dirt bike
whoop section and never feel the
tires leave the ground. Compared to
the RZR S, which occasionally bot-
toms out or skips over a bump or two,
the RZR XP soaks up the rollers and
makes the whoops feel like they are
made out of marshmallows—it works
Jumping the RZR XP is more of the
same. Landings that would normally
have you bracing for a hard hit are
surprisingly plush. And, with the little
extra horsepower, you can use the
gas pedal to help you set the vehicle
up better for some takeoffs. We are
more and more impressed with the
XP every time we drive it.
Like with our findings with the original RZR, we noticed that slow-speed
comfort in the XP is not as good as it
is in the RZR S. You also sit about 2
inches lower in the RZR S, so you feel
a little more confident driving fast
around flat or off-camber corners.
Another downside with the XP when
driving slow is that the steering is
much heavier than it is on the RZR S.
The larger footprint of the XP keeps
it from being transported in the back
of any full-sized pickup. That is unless
you have a custom rack or a flatbed.
This is something to keep in mind if
you are considering buying your first
UTV. Any new trailer capable of
hauling a UTV will set you back
another $500–$800 for sure. Or, if you
own an enclosed trailer or toy hauler,
keep in mind the XP is 2. 5 inches
taller than the RZR S at 73 inches.
It’s actually easier to throw the RZR S sideways because the seat height is lower, as are the speeds you carry through the
corners. There’s not as much lean or body roll in the RZR S.