Spark Plugs - Arctic Cat BEARCAT 2015 Operator's Manual

As the ambient temperature rises or as
the snowmobile is operated at a higher
altitude, the main jets must be replaced
with leaner main jets. The original equip-
ment (production) main jets may need to
be changed (depending on the type of
gasoline you are using, your operating
altitude, and temperature). A Carburetor
Jet Chart decal is located on the belt
guard of the snowmobile. It should be
noted that when selecting the proper
main jets, it is better to be too rich rather
than too lean. To change carburetor main
jets, use the following procedure:

NOTE: Refer to Illustration 0745-
141 in this section for location of
components.
! WARNING
Whenever any maintenance is per-
formed on the fuel system, there
should be no welding, smoking, open
flames, etc., in the area.
CAUTION
Use only GENUINE Mikuni brass main
jets. Also, if using an oxygenated
gasoline (up to 10% ethanol), the car-
buretor main jet must be one size
larger than the main jet required for
regular unleaded gasoline.
CAUTION
A main jet which is too small will
cause severe engine damage. Engine
damage caused by lean jetting WILL
NOT BE covered by Arctic Cat Inc.
warranty policy.
1. Loosen each
clamp and remove each carburetor
from the intake flange and boot.
2. Remove each drain screw and O-
ring from the carburetor float cham-
ber and drain the gas into a small
container or shop towels.
3. Using the main jet wrench (from the
tool kit), thread the main jet out of
each carburetor. Account for the baf-
fle ring. Install the new main jet and
the existing baffle ring. Tighten the
main jet securely.
4. Install each drain screw and O-ring;
then tighten securely.
5. Install and secure the carburetors.
carburetor flange

Spark Plugs

5000

NOTE: If spark plugs must be
replaced, 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.
2000

NOTE: Always use the recom-
mended spark plugs in the engine.
See the appropriate specifications
sheet for correct spark plug gap.
Varying terrain conditions and operating
usage may require spark plugs of a different
heat range. For example, sustained cross-
country riding will usually require colder
heat-range spark plugs while trail riding or
other continual slow speed operation will
usually require hotter heat-range spark plugs.
Removing/Installing Spark
Plugs
1. Remove the spark plug caps from
the plugs.
2. Using a spark plug wrench, remove
the plugs.
3. Install the plugs and finger-tighten.
4. Tighten the spark plugs to 19 ft-lb;
then install the spark plug caps.
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
35