1998 Johnson Evinrude "EC" 90, 115 SPL Service Manual, P/N 520209, Page 92Get 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 flywheelAvoid electrical shock: Perform all ignition coil tests on wooden or insulated bench top Do not handle ignition coil tester leads during output test Do not touch ignition coils or spark plug wires when the engine is being started or while it's runningLessen the possibility of fire and explosion under the engine cover; make sure electrical wires are routed and clamped in their original positions, away from rotating parts which can damage wire insulationIf you've removed the spark plugs, keep the spark tester away from the 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 an authorized replacement or equivalent