Brake - Arctic Cat AC 120 2007 Operator's Manual

A. TAN or LIGHT BROWN insulator
indicates correct spark plug (heat
range).
B. LIGHT GRAY or WHITE insula-
tor indicates overheating of the
engine. This condition is caused by
a too lean condition or incorrect
spark plug (heat range too hot).
C. BLACK insulator indicates fuel in
the combustion chamber is not
burning completely. This condi-
tion is caused by a too rich condi-
tion or incorrect spark plug (heat
range too cold).
NOTE: If the center electrode
insulator is light gray, white, or
black and if the carburetor adjust-
ments and ignition timing are cor-
rect, a different spark plug may
be necessary. Authorized Arctic
Cat Snowmobile dealers have
detailed spark plug information. It
may be wise to consult your
dealer before changing the spark
plug, as an incorrect heat-range
spark plug could cause poor
engine performance or engine
damage.

BRAKE

! WARNING
DO NOT operate the snowmobile
when any component in the brake
system is damaged, worn, or
adjusted improperly.
Arctic Cat recommends that the com-
plete brake system be checked daily for
0725-048
wear or damage and for smooth opera-
tion. Periodically, the brake band
should be inspected for cracks and to
ensure the liner is intact and not worn
excessively. Replace the brake band if
cracked or worn excessively.
Checking Brake Lever
Travel
1. Compress the brake lever fully.
2. Check the distance between the
brake lever and the lever stop. The
distance must be within the speci-
fied range of 6-13 mm (1/4-1/2 in.).
3. If travel distance is not as speci-
fied, adjust the brake.
Adjusting Brake Lever
Travel
To adjust the brake lever travel, use the
following procedure:
1. Remove the drive chain shield.
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