Polaris 2015 ATV Sportsman ACE 570 - Manual (Page 99)

97
MAINTENANCE
Spark Plug
Spark Plug Removal and Replacement
1. Remove the cargo box access panel.
2. Remove the spark plug cap.
3. Using the spark plug wrench provided in the tool kit, remove the
plug by rotating it counter-clockwise.
4. Reverse the procedure for spark plug installation. Torque to
specification. See page 96.
Spark Plug Condition
Normal Plug
The normal insulator tip is gray, tan or light brown. There will be few
combustion deposits. The electrodes are not burned or eroded. This
indicates the proper type and heat range for the engine and the service.
Wet Fouled Plug
The wet fouled 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 of fouling are excessive oil, use
of non-recommended injection oil or incorrect throttle body
adjustments.