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Ever since it's
release back in 1987 the Yamaha Banshee has
been noted for its overheating problems when
the quad is pushed to its limits. The
easiest way to cure this problem is with one
of the many aftermarket heads that have additional
cooling capacity. Companies such as Trinity
or Ohton Racing have taken this design one step
further and spent numerous hours developing
heads that force coolant flow down around the
cylinders to aide in keeping the Banshee running
cooler longer.
 D&D
Power Sports noted engine builders
for some of the fastest grass and asphalt drag
sleds across the country have now decided to
take their knowledge of building top performing
sleds and put it to work in the ATV world.
The have been making pipes for the Raptors,
400EX's and the Eton 90 for a couple of years
now but now they have put their best foot forward
with the introduction of their Banshee Billet
Power Heads. This is an all new design
head that has been proven on their snowmobile
race engines for the past three seasons.
They are individual heads to assure maximum
cylinder sealant and ease of installation.
These heads have large volume water jackets
to provide maximum cooling, allowing for a high
compression ratio for more horsepower.
This radical design allows you to open
only one side if you need to work on one cylinder
and help compensate when you have a cylinder
higher than the other. This is very important
when building their stroker motors.
 D&D
has also designed these heads for the stock
stud lengths and eliminated the need for O-Rings
around each head stud by supplying copper washers
and stainless steel acorn nuts. Another
standard feature of these heads is that the
inner O-Ring position has already been moved
out to accommodate the larger 68mm bore pistons
so you only need to buy one set of domes.
Domes are available in 3
standard sizes 15, 18, or 20cc and the squish
and chamber design is based on their latest
snowmobile head technology. They will
also be stocking blank domes for the builder
who needs a custom cut.
Installation
The first thing
that we noticed when installing this head was
that by using the short factory studs and the
individual heads is that the heads slipped right
down on the cylinders with no added pressure.
Just line up the holes and the heads fall right
on. Once the heads are on you can proceed
to torque the heads without worrying if you
are missing an O-Ring. The installation
of the sparks plugs comes next. We have
found in the past that the first couple of times
that you have to screw your plug into the other
domes out on the market that the plug is acting
like a chaser tap cleaning out the threads of
dome. They screw in hard and need the
use of a wrench to get them in. Not with
the D&D domes, the plug screwed right in by
just using your fingers up to the crush washer.
On a side note all the hardware needed to install
the heads is included except the water spigot
in the back which you will need to unbolt off
from you stock head.
Impression
 With
the head installed and all the hoses hooked
back up we fired up the Banshee and are happy
to report that these heads are leak free.
Once warmed up we took it out to put it through
its paces. Thus, to get the motor hot and test
out there claim about reduced cylinder and head
temps. After a dozen or so runs up and
down the
drag track we shot the external
temps at 94 degrees with the heat gun.
The previous day we had a Trinity Stage IV head
on the heat gun with identical weather conditions
and the external temps on this combo was running
112+ degrees with less runs up and down the
track. As we all know the cooler we can
run our motors the longer they will produce
peak horsepower and there will be less strain
on the internal parts. For the creativity,
ease of installation, and the backing up of
their claim that their head will significantly
lower your cylinder and head temps we strongly
recommend this Banshee head to anyone on the
market who is looking to replace their stock
head. D&D Power Sports also offer a complete
bolt on package for the Banshee consisting of
a Timing Key, V-Force Reeds, and their Head.
For more info
on these products or services contact them at:
D&D Power Sports
4527 Route 410
Lowville, NY 13367
Phone: 315.376.8013
Fax: 315.376.4702
Tech: 315.376.9474
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