1998 Johnson Evinrude "EC" 9.9 thru 30 HP 2-Cylinder Outboards Service Manual, Page 37Get this manual
Preseason Service 1Check gearcase lubrication If leakage is evident, gearcase seals may need attentionCheck lubricant level in power trimtilt reservoirSee Lubrication, this section
11 2Apply light coating ofOMC Electrical Grease to the ribbed
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 torn
11 3Check water level in battery, then chargeWhile the battery
is charging, the acid solution inside the battery gives off hydrogen gas which can explode if ignited by spark or open flameIf 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 batterymake sure the steering, shift, and throttle systems are attached to the engine using the factory-specified hardware stored with the engine earlierFollow the manufacturer's installation instructions! If control systems are attached to the engine using the wrong fasteners or assembled carelessly, sudden unexpected loss of engine control may result5Test engine warning system Refer to Section 8