2007 Evinrude E-Tec 75, 90 HP outboards Service Manual, Page 117Get this manual
SYSTEM ANALYSIS IGNITION OUTPUT Results: GOOD spark control on all cylinders and outboard runs, refer to Running Ignition Tests on p117 and Dynamic Tests on p110 NO spark control on one or more cylinders, note cylindersRefer to Ignition Primary Circuit Resistance Test on p118 and Ignition Coil Tests on p128
Monitor Ignition Output with Timing Light
Use timing light to monitor the spark signal through each of the high tension spark plug wiresStart outboard and observe the timing light's strobeLook for consistent flash and only one flash per revolutionThe strobe of the timing light should be consistent or the same for each cylinder's ignition output
Running Ignition Tests
The purpose of this test is to isolate ignition system malfunctionThis test should be used in conjunction with other ignition system tests to identify component failuresThis test provides limited informationUse the findings of this test to eliminate ignition system componentsA thorough understanding of the outboard's ignition system is required