Arctic Cat DVX 400 2008 Service Manual page 77

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6. Secure the needle jet holder with a wrench; then
remove the main jet.
7. Remove the needle jet holder; then remove the
pilot jet and the starter jet.
8. Remove and install the pilot air screw using the
following procedure.
A. Using a 1/8-in. drill bit with a drill-stop (1) set
at 4 mm (0.16 in.) from the end, drill through
the plug (2).
B. Thread a self-tapping screw into the plug and
use a pliers to pull the plug from the carburetor
body (4).
C. Turn the pilot screw (3) clockwise counting the
turns until it is lightly seated; then remove the
pilot screw accounting for a spring, washer, and
O-ring.
D. After cleaning, install the pilot screw (with a
new O-ring) to the original position by turning
in until it lightly seats; then turning it out the
number of turns counted in step C.
E. Using an appropriate punch, tap a new plug into
place.
9. Unscrew and remove the idle adjustment screw.
Account for the spring and washer.
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4-4
SP287A
ATV2179
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AT THIS POINT
Prior to assembling, the carburetor components
should be cleaned and inspected (see Cleaning and
Inspecting Carburetor sub-section).
ASSEMBLING
1. Screw the idle adjustment screw into the carbure-
tor making sure the washer and spring are properly
positioned.
2. Install the pilot jet (20). Tighten securely; then
install the starter jet (19).
3. Install the main jet into the needle jet holder (17)
and tighten securely; then install the needle jet
holder assembly into the carburetor and tighten
securely.
4. Place the float assembly (with needle valve) into
position and secure to the carburetor with the float
pin.
NOTE: Check float arm height (A) by placing the
carburetor on its side w/float contacting the nee-
dle; then measure with a caliper the height when
the float arm is in contact with the needle valve.
Float arm height should be 13 mm (0.5 in.).
5. Place the float chamber into position making sure
the O-ring is properly positioned; then secure with
the Phillips-head screws.
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SP287B
SP288
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