One of the first things that many people do to
get a little bit more performance out of their ATV's is change
something with their air box and air-filter. Many people at first
remove the lid and change their jetting which is an easy thing to
get just a little more power. Many people go farther and order an
after-market filter like K&N. Some people, like me, decide none
of that is enough, and order a kit from GYT-R that allows them to
run an even bigger air-filter in their stock air box. All of these
modifications do have a downside in the long run, one way or
another.
Since I've had my YFZ, I've gone through airbox
after airbox. I've tried keeping the stock airbox, I've tried 5 or
6 different after-market aluminum airboxes and nothing has seemed
to work very well. The aluminum boxes I tried allowed me to run a
250R air filter, which got me more air, but the box mounts broke
all the time. There is so much flex in the YFZ frame that I would
break a tab or two that holds the box down about every three races.
I eventually ended up going back to the stock box.
I finally got tired of trying to find the right
combination of stuff to get the performance I wanted that would
last and I ended up calling our motor builder at Rossier
Engineering. He had done a couple dyno tests with some stuff and
recommended what I should do. He said that I should keep my larger
GYT-R filter, but stopping running an outerwear directly on it.
Instead I should run EHS Racing custom air box cover. In his tests,
the YFZ using the EHS air box lid showed a couple more horsepower
than the same filter with an outwear and no lid on the box.
The stock airbox lid on the
left, and the EHS Outerwear on the right
Take the outerwear off your filter,
and let it breathe
I can't say that I can feel the power difference
on my ATV because of the work we have done to it so far, but I'm
sure on a stock quad you would be able to feel the difference in
power. The EHS filter also seems to keep my air filter much cleaner
than an outerwear did. It's a lot easier to clean the EHS filter
than any other kind of filter too. The filter is made from a
water-resistant material so that you can't get water in your air
box when its on, but it does make the filter tougher to clean.
Since water won't go through it, you can't just wash the dirt out
the other side. It does come clean though - just take the whole lid
off and wash it in the sink.
One thing you have to be careful of with this
product is to not rip it. If you aren't careful during cleaning or
installing, you could easily rip the filter. But if you do
accidentally rip it, EHS racing has designed the lid so that you
can easily replace the filter part with a new one in one of many
colors for $15.
You can purchase the lid a couple different
ways. You can buy the complete kit that comes with a new lid and
the filter already installed in it for $90. If you don't want to
spend quite that much, they also sell a kit for $70. Instructions
and the hardware you parts you need to make the lid yourself come
in it.
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