2004-2006 Kawasaki 900 STX Jet Ski Service Manual, Page 38Get this manual
2-18 PERIODIC MAINTENANCE Periodic Maintenance Procedure Electrical System
Battery Charging Condition Inspection
Battery charging condition can be checked by measuring battery terminal voltageDisconnect the battery leads (see Electrical System chapter)
CAUTION
Be sure to disconnect the negative () lead first
Measure the battery terminal voltageNOTE
Measure with digital voltmeter [A] which can be read one decimal place voltageIf the reading is below the specified, refreshing charge is requiredBattery Terminal Voltage 12.6 or more Standard:
Spark Plug Inspection
System chapter) Remove the spark plugs (see Electricalelectrodes [A] [B] Examine the ceramic insulator [C] and white, or if there If the insulator appears glazed or very are gray metallic deposits on the electrodes, combustion chamber temperatures are too high(Refer to Troubleshooting If the insulator appears dry and sooty the fuelair mixture is overly richIf the insulator and electrodes are wet and oily, an improper oil type or an excess oil output may be the causeIf the ceramic insulator is cracked, replace the plugIf the electrodes are badly worn or burned, replace the plugExamine the spark plug threadsIf the threads are damaged, replace the plug