36
1. Remove the springs securing the
expansion chamber to the exhaust
manifold and resonator.
2. Move the expansion chamber out of
the way to access the spark plugs.
3. Remove the spark plug caps from
the plugs.
4. Using a spark plug wrench, remove
the plugs.
5. Install the plugs and finger-tighten.
6. Tighten the spark plugs to 19 ft-lb;
then install the spark plug caps.
7. Place the expansion chamber into
position and secure to the exhaust
manifold and resonator with the
springs.
8. Install the hood (see Access Panel/
Hood (Removing/Installing) in the
General Information section of this
manual).
Checking Spark Plugs
800 cc Models
To see if the spark plugs being used are
of the proper heat range (after the snow-
mobile has been operated under normal
driving 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. Consult a
dealer before changing spark plugs,
as incorrect heat-range spark plugs
could cause poor engine performance
or engine damage.
Checking/Adjusting
Valve Clearance (1100
cc Models)
After 5000 miles or prior to seasonal
storage, valve clearance should be
checked and adjusted as necessary.
NOTE: Take the snowmobile to an
authorized Arctic Cat Snowmobile
dealer for inspection and service.
This service is at the discretion and
expense of the snowmobile owner.
Checking/Adjusting
APV Cables (800 cc
Models)
Proper cable adjustment is critical to the
operation of the APV system. Although
inspecting cable adjustment is recommended
every 1000-2000 miles, the cable should not
need adjustment often. To check the cable
adjustment, use the following procedure:
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
It is critical that the checking/adjust-
ing valve clearance be done at the
recommended intervals or severe
engine damage may occur.
Summary of Contents for F 1100 series
Page 7: ...3 Snowmobile Safety Rules...
