1990 Johnson Evinrude 120 thru 140, 185 thru 225, 300 HP, P/N 507875, Page 158Get this manual
Output TestsV8 ill plugs installed and torqued in the cylinder headIf necesSTEPTOTAL OUTPUT TEST f1l 1Loosen power pack and disconnect yellowred lead bullet connectorProvide external ground for power pack2Disconnect port temperature switch whiteblack lead and attach power pack whiteblack lead to clean engine ground3Twist and remove all spark plug leadsf2l 4Adjust the gap on the spark tester to 716 in(11 mm)Connect tester leads to the spark plug leadsSecure tester clip to clean engine groundTo prevent possible arcing of high voltage, route tester leads at least in(51 mm) from any metal surface"" To avoid possible shock hazard, do not handle ignition coils or spark tester during cranking tests5If equipped, install the emergency ignition cutoff switch clip and lanyardCrank the engineSpark should jump each tester gap alternately If tester shows good output on all cylinders, go to STEPRUNNING OUTPUT TEST If tester shows no output on cylinders thru 8, go to STEPSHIFT SWITCH TEST If tester shows good output on at least one cylinder, go to STEPCHARGE COIL TEST If tester shows no output, go to STEPSTOP CIRCUIT TEST6If proceeding to STEPS or 7, complete all circuits disconnected during this testIt is possible for the ignition system to have problem but still produce good outputIf the engine "pops" or "backfires" during starting, the ignition may be out of timeCheck the following: Coil primary wire routing Spark plug lead routing Flywheel condition and location Synchronization and linkage adjustments