Spark Plug; Muffler/Spark Arrester - Arctic Cat 400 Service Manual

Spark Plug

A light brown insulator indicates that a plug is cor-
rect. A white or dark insulator indicates that the
engine may need to be serviced or the carburetor
may need to be adjusted. To maintain a hot, strong
spark, keep the plug free of carbon.
! CAUTION
Before removing a spark plug, be sure to clean the
area around the spark plug. Dirt could enter engine
when removing or installing the spark plug.
Adjust the gap to 0.7 - 0.8 mm (0.028 - 0.032 in.) for
proper ignition. Use a feeler gauge to check the gap.
When installing the spark plug, be sure to tighten it
securely. A new spark plug should be tightened 1/2
turn once the washer contacts the cylinder head. A
used spark plug should be tightened 1/8 - 1/4 turn
once the washer contacts the cylinder head.
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Muffler/Spark Arrester

The muffler has a spark arrester which must be peri-
odically cleaned. At the intervals shown in the Peri-
odic Maintenance Chart, clean the spark arrester
using the following procedure.
! WARNING
Wait until the muffler cools to avoid burns.
1. Remove the three cap screws securing the spark
arrester assembly to the muffler; then loosen and
remove the arrester.
2. Using a suitable brush, clean the carbon deposits
from the screen taking care not to damage the
screen.
NOTE: If the screen or gasket is damaged in any
way, it must be replaced.
3. Install the spark arrester assembly with gasket;
then secure with the three cap screws. Tighten
to 0.6 kg-m (4.0 ft-lb).
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