packages are also available. They
have kits for all the popular UTVs and
most sport quads.
PEASE CUSTOM PERFORMANCE
Phoenix, AZ, (602) 482-6727
Don Pease started his performance
shop after cutting his teeth working
on quad and pilot motors for a company called ATV Racing in Phoenix.
Now his shop’s ATV focus is on big-bore 450 kits and Raptor 700 turbo
upgrades. He claims he can get 130
horsepower out of the Yamaha big
In the UTV world, Pease has come
up with some important fixes for the
RZR XP 900, as well as some exotic
modifications. He tells us that the XP
has a slight oiling issue at the exhaust
cam. His $100 fix will add reliability to
any stock or modified XP. On the exotic side, the team is developing an
under-$4000, turbocharged engine kit
with 9:1 pistons running on E85
ethanol at 15 pounds of boost that
should pump out 165 horsepower—if
that’s what you are into.
RON WOOD RACING
Costa Mesa, CA, (949) 645-0393
Ron Wood didn’t get his start by
building ATV engines. That’s
because he has been building
engines longer than performance
ATVs have been around. Wood has
spent decades building engines for
all of the top flat-track dirt bike racers and has amassed more than a
handful of records and championships.
The first ATV Ron worked on was
the 2004 YFZ450, which he made a
ton of improvements on, including
custom pistons, intake systems and
an exhaust. In fact, Wood sells drag
exhausts ($315) for virtually every
high-performance ATV sold today.
Wood claims his real specialty is
Rotax engines, like those found in
Can-Am products. He has several
DS450 kits ranging from $945–$2000.
Wood also carries complete Maverick
and Commander dual-exhaust systems for $900.
Rancho Cucamonga, CA,
Over the last three decades, we
have tested tons of tricked-out Trinity
project quads. Most of them were
equipped with high-horsepower
engines that always pushed the limits.
Founder Harry McDermit was a pretty
fast rider back in the day and rode for
team Honda. His biggest on-track
accomplishment was when he competed in the Baja 500, with his mother,
wife and kids cheering him on.
Today, Trinity Racing is still well
known for building dirt, sand and
street-drag Banshees that are lightning
fast. At Trinity, you can get a 477cc big-
bore Banshee kit for only $1299. They
don’t leave four-stroke engines alone
either. In January, we tested a 101-
horsepower, 1060cc kit for the Wildcat
that ripped. For the RZR XP 900, Trinity
has developed a 975cc big-bore kit
($1899), a turbo package and a new
nitrous modification. Extensive port
work and countless hours on the flow
bench at Trinity help the guys extract as
much horsepower as possible from
every engine. You can view the work
being done in the Trinity Racing engine
dyno room by following the link at
www.trinityracing.com. To be notified
about upcoming dyno runs, “like” them
Bakersfield, CA, (661) 872-4343
Since the early days, if you needed
a fast three- or four-wheeler, you
wanted a Curtis Sparks engine. Well,
he is still at it today, building engines
for tops riders like Beau Baron and
David Haagsma. On the ATV side,
Sparks’ most popular product is their
Big Block cylinder kits for the Honda
450R, with sizes ranging from 500cc to
520cc. These cast-aluminum cylinders with Nikasil plating are custom
designed by Sparks Racing and
house a list of features not found in
any other TRX big-bore cylinder,
including an enlarged water jacket.
These kits include the cylinder, piston
kit and gaskets and start at $1099.95.
Sparks works on other brand ATV
engines as well.
Recently Curtis Sparks has started
working on improving the Polaris
RZR. They have developed an
exhaust system, fuel controller and
intake setup for the XP 900 that works
very well on both stock and modified
engines. For even more power,
Sparks is working on 935cc, 975cc and
995cc kits for the RZR XP. The 935cc kit
will start at $1700. The larger kits
No matter how much motor work you do to a CVT-equipped
engine, if you don’t make adjustments to the clutch, you are
not getting your money’s worth. CVTech-AAB is considered
an expert in this department.
When you see the owner of an engine shop on the sidelines
at the races, you know he is confident in his products. Sparks
(shown), Duncan and Knowles (CT Racing) can be found at
many races their customers are competing in.