1989 Johnson Evinrude "CE" 9.9 thru 30 Service Manual, P/N 507754, Page 38Get this manual
Preseason Service 1Check gearcase lubrication If leakage is evident, gearcase seals may need attentionCheck lubricant level in power trimtilt reservoirSee Lubrication, this sectionribbed portion of the spark plug ceramics and the opening of the spark plug coversConnect spark plug leadsMake sure spark plug boots are not cracked or tornbattery is charged, the acid solution inside the battery gives off hydrogen gas which can explode if ignited by spark or open flame If hydrogen gas is not able to leave the battery (vents are clogged)the battery itself may explodeTherefore, when charging batteries, make sure that battery is vented to atmosphere and lots of fresh air is in the areaMake sure no sparks or flames are presentDo not short across battery terminals to check battery conditionInstall and connect battery