Table of Contents
Advertisement
3. Install the plugs and finger-
tighten.
4. Tighten the spark plugs to 2.5-2.8
kg-m (18-20 ft-lb); then install the
spark plug caps.
Removing/Installing
Spark Plugs (660 cc
Models)
1. Remove the spark plug/coil cover.
2. Remove the cap screws securing
the spark plug coils to the engine;
then remove the coils.
3. Using a spark plug wrench,
remove the plugs.
4. Install the plugs and finger-
tighten.
5. Tighten the spark plugs to 2.1 kg-
m (15 ft-lb); then install the spark
plug coils and secure them with
cap screws.
6. Install the spark plug/coil cover.
Checking Spark Plugs
(2-Stroke Models)
To see if the spark plugs being used
are of the proper heat range (after the
snowmobile has been operated under
normal driving conditions), remove
the spark plugs and examine the con-
dition of the center electrode insulator
of each spark plug.
MAINTENANCE
A. TAN or LIGHT BROWN
insulator
spark plugs (heat range).
B. LIGHT GRAY or WHITE
insulator indicates over-heat-
ing of the engine. This condi-
tion is caused by a too lean
condition or incorrect spark
plugs (heat range too hot).
C. BLACK insulator indicates
fuel in the combustion cham-
ber is not burning completely.
This condition is caused by a
too rich condition, too much
oil, or incorrect spark plugs
(heat range too cold).
NOTE: If the center electrode
insulators are light gray, white,
or black and if the carburetor
adjustments
models), oil-injection pump syn-
chronization, and ignition timing
are correct, different heat-range
spark plugs may be necessary.
Authorized Arctic Cat Snowmo-
bile dealers have detailed spark
plug
information.
dealer before changing spark
plugs, as incorrect heat-range
spark plugs could cause poor
engine performance or engine
damage.
AO352A
indicates
correct
(on
carbureted
Consult
61
a
Advertisement
Table of Contents
