1998 Johnson Evinrude "EC" 25, 35 HP 3-Cylinder Outboards Service Manual, Page 89Get this manual
& General Safety Warnings
Before working on any part of the ignition system, read the section called Safety at the end of this manualThe engine cover is machinery guardUse caution when conducting tests on running enginesDo not wear jewelry or loose clothingKeep hair, hands, and clothing away from rotating flywheelPerform all ignition coil tests on wooden or insulated bench top to prevent leakage or shock hazardsTo avoid possible shock hazards, do not handle ignition coil or tester leads during output testDo not touch high voltage ignition coils or spark plug wires when engine is being started or when runningShock can cause serious personal injury under certain conditionsTo prevent possible fire and explosion under the engine cover, make sure electrical wires are routed and clamped in original position away from rotating parts which could cut or abrade wire insulationIf necessary to remove the spark plugs, be sure to keep the spark tester away from open spark plug holesReplace 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 equivalent