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By: Team Source
The stock intake and air box
system on the Honda TRX250R can become restrictive when the
engine is modified for high output. Additionally, typically
when modifications are performed to the engine, a larger
diameter carburetor is installed as well. The stock
carburetor in on 250R is only 34mm. Most high output engines
use at least a 38mm carb. The stock intake boot is very
difficult to install.
As mentioned
when the engine is modified for high output, the amount of
intake air required increases as well. The stock air box,
with lid installed, simply will not flow enough air to supply
a well tuned high output engine. To alleviate this, you can
remove the air box lid, which helps in some cases, but
ultimately, you might as well not run an airbox all together.
In the case of most riders who ride in the sand dunes, an
airbox is simply not needed. The benefit is increased
available air as mentioned, as well as, a greatly cleaned up
look for your ride.
 Eddie
Sanders Racing, offers an airbox eliminator kit that
totally eliminates the stock airbox, provides a larger
diameter boot for ease of installation on larger diameter
carbs, and is a neat and clean look for your quad. The kit
comes complete with a hi-flow K&N air filter, the necessary
tubing and clamps, and an Outwear to use with the K&N.
 In
the case of the ESR center mount pipes, the filter elimination
kit is required. The air box is too large and bulky to
provide room for the silencer AND air filter. The air filter
and silencer fit very well together between the frame rails.
Installation is
equally as simple. Remove the stock snorkel, air box
assembly, and intake boot. Prior to beginning any of this
work, ensure that the work area and parts are clean and free
of any debris that would possibly contaminate the intake
tract. Installation of the kit is again simple. Place the
boot over the carb, install the aluminum sleeve, clamp the
filter on, position the filter, and slide the outerwear over
the filter element.
 The
supplied sleeve slid easily over a 40.5mm Keihin carb, which
with the stock intake boot was very difficult to do without
heating the intake boot to make it stretch. Other benefits
included, when used with an aftermarket reed cage or reed
block spacer, no longer is it a hassle to get the airbox
forward or aft far enough to mate up properly.
As with ANY
modification that alters the intake, combustion, or exhaust of
any engine. Re-check and verify your jetting. ATV Source
does not recommend a filter elimination kit for any rider that
may ride in very wet or extremely dusty conditions.
ESR offers
their kit for $35.00, the kit comes complete with filter, the
required tubing and hardware. Outerwares are also available
for $12.95.
ESR
1510 E. Main St. Unit C
Visalia, CA 93292
Phone: (559) 625-3157
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