2005 Kawasaki STx-12F Jet Ski Factory Service Manual., Page 351Get this manual
ELECTRICAL SYSTEM 14-39 Ignition System
Ignition Coil Inspection
Measuring arcing distance The most accurate test for determining the condition of the ignition coil is made by measuring arcing distanceRemove the ignition coil (see this section)C the] (w the installed on the spark plug lead) to the tester [B], and measure the arcing distanceAuxiliary WiresC]
WARNING
To avoid extremely high voltage shocks, do not touch the coil leadIf the distance reading is less than the specified value, the ignition coil or spark plug cap is defective3 Needle Arcing Distance Standard:e