71
MAINTENANCE
Spark Plugs
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.
The tip should not be white. A white insulator tip indicates overheating,
caused by use of an improper spark plug or incorrect carburetor/throttle
body 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. Rotate the spark plug counter-clockwise to remove it.
3. Reverse the procedure for spark plug installation.
4. Torque to 18-22 ft. lbs. (24-30 Nm).
5. Reinstall the spark plug cap.
Summary of Contents for 550 IQ 136 2013
Page 1: ...Snowmobile Owner s Manual for Maintenance and Safety 550 IQ Shift 550 IQ 136 550 IQ LXT...
Page 3: ...The text is printed on 100 recycled with 40 post consumer waste PCW...
Page 124: ...120 MAINTENANCE LOG DATE MILES KM TECHNICIAN SERVICE PERFORMED COMMENTS...
Page 125: ...121 MAINTENANCE LOG DATE MILES KM TECHNICIAN SERVICE PERFORMED COMMENTS...