1988 Johnson Evinrude "CC" 9.9 thru 30 Service Manual, P/N 507660, Page 119Get this manual
General Safety Warnings The 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 flywheel Perform all ignition coil tests on wooden or insulated bench top to prevent leakage or shock hazards To avoid possible shock hazards, do not handle ignition coil or tester leads during output test Do 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 conditions To 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 insulation If necessary to remove the spark plugs, be sure to keep the spark tester away from empty spark plug openings in the cylinder head Replace 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