Polaris ATP 500 4x4 - Manual (Page 112)

109
MAINTENANCE AND LUBRICATION
Spark Plugs
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Use the recommended spark plugs for your model
(see SPECIFICATIONS beginning on page 126).
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Make sure the electrode gap meets specifications for your model.
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Torque spark plugs to 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 has been warmed
up and the vehicle has been 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 spark plug cap.
2. Using the special wrench provided in the tool pouch, rotate the
spark plug counterclockwise to remove.
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 spark plugs.
CAUTION
WARNING
A hot exhaust system and engine can cause serious burns. Wear
protective gloves when removing a spark plug for inspection.