1987 Johnson/Evinrude CU Outboards 35A thru 55 Service Manual, Page 127Get this manual
Flywheel Servicing InformationAll Models
In order to produce the current and 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 C.Dvoltmeter which may cause unnecessary replacement of ignition componentsFlywheel magnets rarely go bad and would only be checked as last resort in solving an ignition problemRemoval of Flywheel
1Avoid accidental starting of motorDisconnect the fivewire connector between the armature plate and power pack, or disconnect the spark plug leads (magneto ignition system)
2Remove the flywheel nut using strap wrench or other L!Jt=J suitable tool to hold the flywheel
3Apply OMC Moly Lube to threads of pressing screw and center hole of crankshaft4Assemble the following components: 307636 Body 307637 Pressing Screw 307638 Handle 307641 Screws (3) 307639 Washers (3)