1990 Johnson Evinrude 120 thru 140, 185 thru 225, 300 HP, Service Repair Manual P/N 507875, Page 274Get this manual
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Disassembly 1 Remove the propeller and mounting hardwareInspect the propeller for spun hubfJ1 2 Drain the gearcase by first removing the oil level plugthen the oil filildrain plug You will find magnet