Arctic Cat Altera 300, Service Manual

Page: 8 / 102

7
7. Remove any excess water from the elements by mat-
ting with a towel; then allow the elements to dry
completely.
8. Spray oil generously onto the air filter elements and
work the oil in. Squeeze the elements to remove
excess oil.
9. Clean any dirt or debris from inside the air cleaner.
Make sure no dirt enters the carburetor.
10. Install the foam elements onto the frame; then place
the assembly into position in the housing and secure
with the retaining cap screw.
11. Install the air filter housing cover and secure with the
retaining clips; then install the seat making sure it
locks securely.
CHECKING/DRAINING DRAIN TUBE
Periodically check the drain tube for gasoline or oil accu-
mulation. 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 fol-
lowing procedure.
 NOTE: Check and adjust valve clearances when the
engine is cold.

NOTE: The seat assembly, side panels, and gas tank
must be removed for this procedure.
1. Remove the timing inspection plug and flywheel nut
cover; then remove the cylinder head cover (see
Engine/Transmission - Removing Top-Side Compo-
nents).
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 camshaft
gear should be up.
3. Place Tappet Adjuster onto the jam nut securing the
tappet adjuster screw; then rotate the adjuster dial
clockwise until the end is seated in the tappet
adjuster screw.
4. While holding the adjuster dial in place, use the
adjuster handle and loosen the jam nut; then rotate
the tappet adjuster screw clockwise until friction is
felt.
5. Align the adjuster handle with one of the marks on
the adjuster dial.
6. While holding the adjuster handle in place, rotate the
adjuster dial counterclockwise until proper
valve/tappet clearance is attained.
 NOTE: Refer to the appropriate specifications in
Engine/Transmission for the proper valve/tappet
clearance.
 NOTE: Rotating the adjuster dial counterclockwise
will open the valve/tappet clearance by 0.05 mm
(0.002 in.) per mark.
7. While holding the adjuster dial at the proper clear-
ance 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 timing inspection plug.
Testing Engine
Compression
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 tension
lead to the plug and ground the plug on the cylinder
head well away from the spark plug hole.
4. Attach the gauge from Compression Tester Kit.
CAUTION
A torn air filter can cause damage to the ATV engine.
Dirt and dust may get inside the engine if the element is
torn. Carefully examine the element for tears before and
after cleaning it. Replace the element with a new one if it
is torn.
! WARNING
Always wear safety glasses when using compressed
air.