Polaris 2001 ATV Universal ATV - Manual (Page 142)

131
MAINTENANCE
Spark Plugs
Check your owner’s manual supplement for recommended spark
plug and gap.
The spark plug and its condition is indicative of engine operation.
The spark plug firing end condition should be read after the engine
is warmed up and the vehicle is driven at higher speeds. Immedi-
ately check the spark plug for correct color.
1. Normal
The insulator tip is gray, tan or light brown. There will be few com-
bustion deposits. The electrodes are not burned or eroded. This
indicates the proper type and heat range for the engine and the
service.
NOTE: The tip should not be white. A white insulator tip indicates
overheating, caused by use of an improper spark plug or incorrect
carburetion adjustments.
2. Wet Fouled
The insulator tip is black. A damp oil film covers the firing end.
There may be a carbon layer over the entire nose. Generally, the
electrodes are not worn. General causes are excessive oil, use of
non-recommended injection oil, improper use of the choke, or in-
correct carburetion adjustments.
Spark Plug Removal and Replacement
The spark plug is removed by using the special wrench provided
in the tool pouch. Remove the spark plug cap and then the spark
plug by rotating counterclockwise.
Reverse the procedure for spark plug installation. Torque to 17 ft.
lbs.
Never deviate from the recommended spark plug as engine dam-
age can occur.
Never attempt to remove a spark plug while the engine is
warm. The exhaust system or engine could burn you causing
severe injury.