2-4
2. Replace any drain that is cracked or shows any signs
of hardening or deterioration.
3. Wipe any accumulation of oil or gas from the filter
housing and drains.
Valve/Tappet Clearance
To check and adjust valve/tappet clearance, use the fol-
lowing procedure.
1. Remove the timing inspection plug; then remove the
tappet covers and spark plug (for more detailed
information, see Section 3 - Servicing Top-Side
Components).
2. Rotate the crankshaft to the TDC position on the
compression stroke.
NOTE: At this point, the rocker arms and adjuster
screws must not have pressure on them.
Feeler Gauge Procedure
Using a feeler gauge, check each valve/tappet clearance.
If clearance is not within specifications, loosen the jam
nut and rotate the tappet adjuster screw until the clear-
ance is within specifications. Tighten each jam nut
securely after completing the adjustment.
CC007DC
Valve Adjuster Procedure
NOTE: The seat, storage compartment cover
assembly, compartment box, air filter/filter housing,
and left-side/right-side splash panels must be
removed for this procedure.
A. Place Valve Clearance Adjuster onto the jam nut
securing the tappet adjuster screw; then rotate the
valve adjuster dial clockwise until the end is
seated in the tappet adjuster screw.
B. While holding the valve adjuster dial in place, use
the valve adjuster handle and loosen the jam nut;
then rotate the tappet adjuster screw clockwise
until friction is felt.
C. Align the valve adjuster handle with one of the
marks on the valve adjuster dial.
D. While holding the valve adjuster handle in place,
rotate the valve adjuster dial counterclockwise
until proper valve/tappet clearance is attained.
NOTE: Refer to the appropriate specifications in
Feeler Gauge Procedure sub-section 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.
E. While holding the adjuster dial at the proper
clearance setting, tighten the jam nut securely
with the valve adjuster handle.
3. Install the timing inspection plug.
4. Place the tappet covers into position making sure the
proper cap screws are with the proper cover. Tighten
the cap screws securely.
5. Install the spark plug.
Testing Engine
Compression
To test engine compression, use the following procedure.
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 Compression Tester Kit.
CAUTION
The drain to the right is the clean air section of the filter
housing. Any leak of this drain will allow dirt into the
engine intake causing severe engine damage.
CAUTION
The feeler gauge must be positioned at the same angle
as the valve and valve adjuster for an accurate measure-
ment of clearance. Failure to measure the valve clear-
ance accurately could cause valve component damage.
VALVE/TAPPET CLEARANCE
650
0.08-0.12 mm (0.003-0.005 in.) - Intake
0.13-0.17 mm (0.005-0.007 in.) - Exhaust
! WARNING
Always wear safety glasses when using compressed
air.
FOR ARCTIC CAT ATV DISCOUNT PARTS CALL 606-678-9623 OR 606-561-4983
www.mymowerparts.com
