Mercury Mariner 25HP 4-Stroke Outboard Service Manual 1997, Page 64Get this manual
Flywheel Removal and Installation Engine CQuid possibly start when turning flywheel during removal and installationTo prevent this type of accidental engine starting and possible serious injury, always remove spark plug leads from spark plugs
3Hold flywheel using flywheel holder (91-S3163M)Remove nul (30mm) and washer55774