air_box_install

Air Box Install Guide

Degree of Difficulty: 1

Tools & parts needed:
1) Basic Hand Tools
2) Air box

This is a dual purpose install guide.
This can be used if you simply need to
replace your stock air box if it is broken
or cracked. It can also be used to
replace your stock air box with an after
market aluminum and/or high flow air
box. UM Performance was nice
enough to supply an aluminum high
flow air box for this project.

Step 1 Remove the air box lid by
releasing the six retaining clips. This
should allow the lid to be pulled off.
See image 1

Step 2 Remove the air filter by
loosening the clamp and unscrewing
the Phillips head screw. Also pull the
breather hose out on the right
side.See image 2.

Step 3 Remove the 3 mounting bolts
located on the right(2) and left(1) side
under the rear fenders. See images 3
& 4.

Step 4 Remove the rubber intake
boot by loosening the clamp at the
carburetor. This step is optional but
makes life much easier when you are
fitting the rubber boot into the new air
box. See iamge 5.

Step 5 At this point the air box should
be loose and can be dropped out the
bottom and out the rear of the quad.
See image 6.

Step 6 You now need to transfer all
the hardware from the old box to the
new box. All the clips and mounting
bolt nuts have to be transferred. See
image 7. You can skip this step if you are
installing an after market air box.

Step 7 Now you need to fit the intake
boot to the new air box. If installing an
after market box it may connect to the
box slightly different than it did to the
stock box. The UM requires a hose
clamp where it attach's to the round air
filter adapter inside the box. The intake
boot also has a groove where it
mounts to the box and must be
installed properly and seated properly
into the air box. See images 5 & 8.

Step 8 Install the air box into position
but do not install any bolts at this point.
Install the boot onto the carburetor and
tighten the clamp. Now you can install
the three mounting bolts but do not
tighten any of the bolts until all have
been started by hand. The UM box
uses hardware supplied with the new
box. See images 9 & 9A.

Step 9 If using the UM box and their
lid, you need to install the velcro to the
top edge of the air box. See image 10.

Step 10 Install the air filter. If using an
after market box, it may require a
different air filter. The UM box requires
a K&N 4250 4" filter. See images 10 &
11.

Step 11 Install the lid. If using an after
market high flow box, you may need to
re-jet your carburetor. See images 12
& 13.

Thanks to the guys at UM Performance
for supplying the air box for this project.

This site was developed and maintained by Jeff Poole. Honda, TRX450R, Fourtrax,
and all other Honda related terms are property of Honda America Corporation.