Polaris Series 11 Ranger - Manual (Page 77)

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MAINTENANCE AND LUBRICATION
Spark Plugs
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Use NGK BKR5ES spark plugs.
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Proper electrode gap is .025″ (.06 cm).
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Spark plug torque is 14 ft. lbs.(19 Nm).
Spark plug 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. Immediately check the spark
plug for correct color.
1. Normal
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.
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 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, improper use of the choke, or
incorrect carburetion adjustments.
Spark Plug Removal and Replacement
1. Remove the seat to access the engine compartment.
2. Remove the spark plug cap. Using the spark plug wrench provided
in the tool kit, remove the plug by rotating it counterclockwise.
3. Reverse the procedure for spark plug installation. Torque to 14 ft.
lbs. (19 Nm).
Using non-recommended spark plugs can result in serious engine
damage. Always use Polaris-recommended spark plugs.
CAUTION
WARNING
A hot exhaust system and engine can cause serious burns. Wear
protective gloves when removing a spark plug for inspection.