Polaris 120 - Manual (Page 60)

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ADULT SECTION
Maintenance
Spark Plugs
A new engine can cause temporary spark plug fouling even though the
heat range is proper, due to the preservative which has been added
during assembly of the engine to combat rust and corrosion. Avoid
prolonged idle speeds, as plug fouling and carbonization will result.
CAUTION
Using non-recommended spark plugs can result in serious engine
damage. Always use Polaris-recommended spark plugs.
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Use BR6ES spark plugs.
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Proper electrode gap is .028″ (.70 mm).
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Spark plug torque is 12-14 ft. lbs. (16-19 Nm).
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Always carry spare spark plugs
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. Immediately check the spark plug
for correct color.
WARNING
A hot exhaust system and engine can cause serious burns. Wear
protective gloves when removing a spark plug for inspection.
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 oil, improper use of the choke, or incorrect
carburetion adjustments.