26
Checking Spark Plugs
To see if the spark plugs being used are of
the proper heat range (after the snowmo-
bile has been operated under normal driv-
ing conditions), remove the spark plugs
and examine the condition of the center
electrode insulator of each spark plug.
AO352A
A. TAN or LIGHT BROWN insula-
tor indicates correct spark plugs
(heat range).
B. LIGHT GRAY or WHITE insula-
tor indicates over-heating of the
engine. This condition is caused by
a too lean condition or incorrect
spark plugs (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 con-
dition, too much oil, or incorrect
spark plugs (heat range too cold).
NOTE: If the center electrode insu-
lators are light gray, white, or black
and if the oil-injection pump synchro-
nization and ignition timing are cor-
rect, different heat-range spark plugs
may be necessary. Authorized Arctic
Cat Snowmobile dealers have
detailed spark plug information. Con-
sult a dealer before changing spark
plugs, as incorrect heat-range spark
plugs could cause poor engine per-
formance or engine damage.
Checking/Adjusting
APV Cables
Proper cable adjustment is critical to the
operation of the APV system. Although
inspecting cable adjustment is recom-
mended every 1000-2000 miles, the cable
should not need adjustment often. To
check the cable adjustment, use the fol-
lowing procedure:
742-209A
1. Using a small needle-nose pliers,
remove the servomotor retaining
clip (800/1000 cc models) and the
cable holder.
0744-489
2. Using an adjustable wrench, rotate
the servomotor actuator counter-
clockwise to loosen the cable; then
pull the cable housings down and
out of the servomotor.
NOTE: For installing purposes,
note the side that the servomotor
cables are installed on.
3. Slide each cable drum out of the slot
of the servomotor actuator.
CAUTION
If a spark plug is light gray, white, or
black and another is tan or light
brown, take the snowmobile to an
authorized Arctic Cat Snowmobile
dealer for inspection and service. If
not under warranty, this service is at
the discretion and expense of the
snowmobile owner.
CAUTION
Do not use the nut securing the pul-
ley to the servomotor to rotate the
actuator.