1997 Johnson Evinrude "EU" 90, 105RW, 115, 150, 150W, 175 60 LV Service Manual, P/N 507268, Page 143Get this manual
General Safety Warnings
Before working on any part of the powerhead, read the section called Safety at the end of this manualThe timing wheel cover is machinery guardUse caution when servicing running engineDo not wear jewelry or loose clothingTo prevent possible fire or explosion under the engine cover after servicing: Check entire fuel system for leaks Make sure all electrical and ignition leads are routed and clamped in their original positions away from rotating engine parts which could cut or abrade wire insulationTo avoid accidental starting of engine while servicing, take adequate precautions to disarm the ignition systemConnect engine wiring harness to boat wiring harness with key switch in OFF position Twist and remove all spark plug leads from spark plugs Disconnect the battery cables from the batteryReplace any locking fastener (locknut or patch screw) if its locking feature becomes weakDefinite resistance to tightening must be felt when reusing locking fastenerIf replacement is indicated, use only authorized replacement or equivalentTo prevent sudden movement when starting engine and possible tIman overboard" situations, test the "start-in-gear-prevention" feature before returning the engine to customer