Arctic Cat DVX 250 2007, Service Manual

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2
CHECKING/DRAINING DRAIN TUBE
Periodically check the drain tube for gasoline or oil
accumulation. If noticed, remove the drain tube cap
from beneath the housing and drain the gasoline or
oil into a suitable container; then install and secure
the tube cap.
KM114
Valve/Tappet Clearance
To check and adjust valve/tappet clearance, use the
following procedure.
„
NOTE: The seat assembly, side panels, and gas
tank must be removed for this procedure.
1. Remove the timing inspection plug; then
remove the cylinder head cover (see Section 3 -
Removing Top-Side Components).
2. Rotate the crankshaft so the “T” mark on the fly-
wheel aligns with the index mark on the
right-side crankcase cover.
„
NOTE: At this point, the round hole in the cam-
shaft gear should be up.
„
NOTE: Use Valve Clearance Adjuster (p/n
0444-178) for this procedure.
3. Place the valve adjuster onto the jam nut secur-
ing the tappet adjuster screw; then rotate the
valve adjuster dial clockwise until the end is
seated in the tappet adjuster screw.
4. While holding the valve adjuster dial in place,
use the valve adjuster handle and loosen the jam
nut; then rotate the tappet adjuster screw clock-
wise until friction is felt.
5. Align the valve adjuster handle with one of the
marks on the valve adjuster dial.
6. While holding the valve adjuster handle in
place, rotate the valve adjuster dial counter-
clockwise until proper valve/tappet clearance is
attained.
„
NOTE: Refer to the appropriate specifications in
Section 3 for the proper valve/tappet clearance.
„
NOTE: Rotating the valve adjuster dial counter-
clockwise will open the valve/tappet clearance by
0.05 mm (0.002 in.) per mark.
7. While holding the adjuster dial at the proper
clearance setting, tighten the jam nut securely
with the valve adjuster handle.
8. Place the cylinder head cover with a new O-ring
into position; then tighten the cover securely.
KM703
9. Install the spark plug; then install the timing
inspection plug.
Testing Engine
Compression
To test engine compression, use the following pro-
cedure.
1. Remove the high tension lead from the spark
plug.
2. Using compressed air, blow any debris from
around the spark plug.
3. Remove the spark plug; then attach the high ten-
sion lead to the plug and ground the plug on the
cylinder head well away from the spark plug
hole.
! WARNING
Always wear safety glasses when using compressed
air.
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