1988 Johnson/Evinrude "CC" 40 thru 55 Models Service Manual, Page 251Get this manual
General Safety Warnings
The motor cover is machinery guardUse caution when conducting tests on running enginesDo not wear jewelry or loose clothing Before working on or removing any electrical parts, disconnect the battery cables at battery to prevent electrical sparks Before returning the outboard motor to the owner, make sure: all electrical connections are tight, insulator boots and sleeves are in place, and electrical wires are routed and clamped in the original position Do not use jumper cables and booster battery to start engineDo not charge battery in the boat with an external chargerFumes vented during either operation can lead to an explosion Replace any locking-type fastener (locknut or patch screw) if its locking feature becomes weakDefinite resistance to tightening must be felt or locking fastener is not suitable for continued useReplace only with authorized replacement part or equivalent