Polaris Trail RMK - Manual (Page 80)

77
MAINTENANCE
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 at higher speeds. Immediately check the
spark plug for correct color.
NOTE: Incorrect fuel mixture can often cause a spark plug to appear
too dark or too light in color. Before changing spark plug heat
ranges, be sure the correct main jet is installed in the carbure-
tor(s). Refer to the specifications section beginning on page
110 .
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 indi-
cates the proper type and heat range for the engine and the service.
NOTE: The tip should not be white. A white insulator tip indicates over-
heating, caused by use of an improper spark plug or incorrect
carburetion adjustments.
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, improper use of the choke, or incor-
rect 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 it.
3. Reverse the procedure for spark plug installation. Torque to 18-22
ft. lbs. (24.4-29.8 Nm).
4. Reinstall the spark plug cap.
WARNING
A hot exhaust system and engine can cause serious burns. Wear protective
gloves when removing a spark plug for inspection.