1997 Johnson Evinrude "EU" 90 thru 115 90 CV Service Manual, P/N 507267, Page 96Get this manual
Flywheel Servicing INotel In order to produce the voltage necessary to run an ignition system, the flywheel magnets must be of particular strengthWeak flywheel magnets can cause low ignition voltage, which could affect motor performanceWeak flywheel magnets can also cause low readings on ignition test equipment, such as the peak-reading voltmeter, which may cause unnecessary replacement of ignition components
An accurate test of alternator output can help determine the flywheel's conditionRefer to Running Test, Alternator Output, Section 7
Removal
1To avoid accidental starting of engine while servicing, twist and remove all spark plug leads2Remove flywheel nut using strap wrench or other suitable tool to hold the flywheel