1986+ Mercury 6/8/9.9/10/15HP 2-stroke Factory Service Manual, Page 66Get this manual
IGNITION SYSTEM
Ignition Components Removal and Installation
CAUTION
Do not strike flywheel with hard object as flywheel damage could occurInspect flywheel magnets for clinging debris before installation
WARNING
Engine could possibly start when turning flywheel during removal and installationDisconnect (and isolate) spark plug leads