Valve/Tappet Clearance - Arctic Cat XC 450i 2012 Service Manual

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10. Install the air filter housing assembly into the mount-
ing bracket and secure with two reinstallable rivets.
11. Install the inlet pipe onto the air box; then connect to
the air filter assembly making sure the boots are fully
engaged. Tighten the clamps securely.
CAUTION
Failure to fully engage the inlet boots to the indicator
marks could result in ingestion of dirt and severe
engine damage.
CHECKING AND CLEANING DRAIN
1. Inspect the drain on the filter housing cover and
clean out any dirt or debris.
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 drain.

Valve/Tappet Clearance

To check and adjust valve/tappet clearance, use the fol-
lowing procedure.
NOTE: The seat, left-side and right-side engine
covers, and gas tank must be removed for this pro-
cedure.
1. Remove the timing inspection plug and spark plug;
then remove the tappet covers (for more detailed
information, see Engine/Transmission - Servicing
Top-Side Components).
www.mymowerparts.com
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.
KC445A
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.
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.
Intake
Exhaust
KC397B
Valve Adjuster Procedure
A. Place the 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.
Manual
Table of Contents
CAUTION
VALVE/TAPPET CLEARANCE
0.076-0.127 mm (0.003-0.005 in.)
0.152-0.203 mm (0.006-0.008 in.)
CF005
CC007DC
9