30
747-545A
NOTE: The tabs on the MAG side
of the coolant tank are to hold extra
spark plugs.
XM130A
Spark Plugs
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 differ-
ent 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.
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.
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).
CAUTION
After operating the snowmobile for
the initial 5-10 minutes, stop the
engine, allow the engine to cool
down, and check the coolant level.
Add coolant as necessary.
CAUTION
If adjusting spark plug gap is neces-
sary, do not use the center electrode
as a leverage point. Damage to the
plug may occur.
